1. 30 Apr, 2016 40 commits
    • Alex Deucher's avatar
    • Guenter Roeck's avatar
      hwmon: (max1111) Return -ENODEV from max1111_read_channel if not instantiated · 57dbfea6
      Guenter Roeck authored
      commit 3c2e2266 upstream.
      
      arm:pxa_defconfig can result in the following crash if the max1111 driver
      is not instantiated.
      
      Unhandled fault: page domain fault (0x01b) at 0x00000000
      pgd = c0004000
      [00000000] *pgd=00000000
      Internal error: : 1b [#1] PREEMPT ARM
      Modules linked in:
      CPU: 0 PID: 300 Comm: kworker/0:1 Not tainted 4.5.0-01301-g1701f680 #10
      Hardware name: SHARP Akita
      Workqueue: events sharpsl_charge_toggle
      task: c390a000 ti: c391e000 task.ti: c391e000
      PC is at max1111_read_channel+0x20/0x30
      LR is at sharpsl_pm_pxa_read_max1111+0x2c/0x3c
      pc : [<c03aaab0>]    lr : [<c0024b50>]    psr: 20000013
      ...
      [<c03aaab0>] (max1111_read_channel) from [<c0024b50>]
      					(sharpsl_pm_pxa_read_max1111+0x2c/0x3c)
      [<c0024b50>] (sharpsl_pm_pxa_read_max1111) from [<c00262e0>]
      					(spitzpm_read_devdata+0x5c/0xc4)
      [<c00262e0>] (spitzpm_read_devdata) from [<c0024094>]
      					(sharpsl_check_battery_temp+0x78/0x110)
      [<c0024094>] (sharpsl_check_battery_temp) from [<c0024f9c>]
      					(sharpsl_charge_toggle+0x48/0x110)
      [<c0024f9c>] (sharpsl_charge_toggle) from [<c004429c>]
      					(process_one_work+0x14c/0x48c)
      [<c004429c>] (process_one_work) from [<c0044618>] (worker_thread+0x3c/0x5d4)
      [<c0044618>] (worker_thread) from [<c004a238>] (kthread+0xd0/0xec)
      [<c004a238>] (kthread) from [<c000a670>] (ret_from_fork+0x14/0x24)
      
      This can occur because the SPI controller driver (SPI_PXA2XX) is built as
      module and thus not necessarily loaded. While building SPI_PXA2XX into the
      kernel would make the problem disappear, it appears prudent to ensure that
      the driver is instantiated before accessing its data structures.
      
      Cc: Arnd Bergmann <arnd@arndb.de>
      Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      57dbfea6
    • Joseph Qi's avatar
      ocfs2/dlm: fix BUG in dlm_move_lockres_to_recovery_list · cea90036
      Joseph Qi authored
      commit be12b299 upstream.
      
      When master handles convert request, it queues ast first and then
      returns status.  This may happen that the ast is sent before the request
      status because the above two messages are sent by two threads.  And
      right after the ast is sent, if master down, it may trigger BUG in
      dlm_move_lockres_to_recovery_list in the requested node because ast
      handler moves it to grant list without clear lock->convert_pending.  So
      remove BUG_ON statement and check if the ast is processed in
      dlmconvert_remote.
      Signed-off-by: default avatarJoseph Qi <joseph.qi@huawei.com>
      Reported-by: default avatarYiwen Jiang <jiangyiwen@huawei.com>
      Cc: Junxiao Bi <junxiao.bi@oracle.com>
      Cc: Mark Fasheh <mfasheh@suse.de>
      Cc: Joel Becker <jlbec@evilplan.org>
      Cc: Tariq Saeed <tariq.x.saeed@oracle.com>
      Cc: Junxiao Bi <junxiao.bi@oracle.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      cea90036
    • Joseph Qi's avatar
      ocfs2/dlm: fix race between convert and recovery · 6af67aba
      Joseph Qi authored
      commit ac7cf246 upstream.
      
      There is a race window between dlmconvert_remote and
      dlm_move_lockres_to_recovery_list, which will cause a lock with
      OCFS2_LOCK_BUSY in grant list, thus system hangs.
      
      dlmconvert_remote
      {
              spin_lock(&res->spinlock);
              list_move_tail(&lock->list, &res->converting);
              lock->convert_pending = 1;
              spin_unlock(&res->spinlock);
      
              status = dlm_send_remote_convert_request();
              >>>>>> race window, master has queued ast and return DLM_NORMAL,
                     and then down before sending ast.
                     this node detects master down and calls
                     dlm_move_lockres_to_recovery_list, which will revert the
                     lock to grant list.
                     Then OCFS2_LOCK_BUSY won't be cleared as new master won't
                     send ast any more because it thinks already be authorized.
      
              spin_lock(&res->spinlock);
              lock->convert_pending = 0;
              if (status != DLM_NORMAL)
                      dlm_revert_pending_convert(res, lock);
              spin_unlock(&res->spinlock);
      }
      
      In this case, check if res->state has DLM_LOCK_RES_RECOVERING bit set
      (res is still in recovering) or res master changed (new master has
      finished recovery), reset the status to DLM_RECOVERING, then it will
      retry convert.
      Signed-off-by: default avatarJoseph Qi <joseph.qi@huawei.com>
      Reported-by: default avatarYiwen Jiang <jiangyiwen@huawei.com>
      Reviewed-by: default avatarJunxiao Bi <junxiao.bi@oracle.com>
      Cc: Mark Fasheh <mfasheh@suse.de>
      Cc: Joel Becker <jlbec@evilplan.org>
      Cc: Tariq Saeed <tariq.x.saeed@oracle.com>
      Cc: Junxiao Bi <junxiao.bi@oracle.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      6af67aba
    • Alex Deucher's avatar
    • Guenter Roeck's avatar
      MAINTAINERS: Update mailing list and web page for hwmon subsystem · a067190d
      Guenter Roeck authored
      commit 968ce1b1 upstream.
      
      The old web page for the hwmon subsystem is no longer operational,
      and the mailing list has become unreliable. Move both to kernel.org.
      Reviewed-by: default avatarJean Delvare <jdelvare@suse.de>
      Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
      [bwh: Backported to 3.16: the set of hwmon drivers is different, so do a
       search-and-replace for the same addresses]
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      a067190d
    • Petri Gynther's avatar
      net: bcmgenet: fix skb_len in bcmgenet_xmit_single() · ab020c41
      Petri Gynther authored
      commit 7dd39913 upstream.
      
      skb_len needs to be skb_headlen(skb) in bcmgenet_xmit_single().
      
      Fragmented skbs can have only Ethernet + IP + TCP headers (14+20+20=54 bytes)
      in the linear buffer, followed by the rest in fragments. Bumping skb_len to
      ETH_ZLEN would be incorrect for this case, as it would introduce garbage
      between TCP header and the fragment data.
      
      This also works with regular/non-fragmented small packets < ETH_ZLEN bytes.
      Successfully tested this on GENETv3 with 42-byte ARP frames.
      
      For testing, I used:
      ethtool -K eth0 tx-checksum-ipv4 off
      ethtool -K eth0 tx-checksum-ipv6 off
      echo 0 > /proc/sys/net/ipv4/tcp_timestamps
      
      Fixes: 1c1008c7 ("net: bcmgenet: add main driver file")
      Signed-off-by: default avatarPetri Gynther <pgynther@google.com>
      Acked-by: default avatarEric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      ab020c41
    • Guillaume Nault's avatar
      ppp: take reference on channels netns · 6ab3a433
      Guillaume Nault authored
      commit 1f461dcd upstream.
      
      Let channels hold a reference on their network namespace.
      Some channel types, like ppp_async and ppp_synctty, can have their
      userspace controller running in a different namespace. Therefore they
      can't rely on them to preclude their netns from being removed from
      under them.
      
      ==================================================================
      BUG: KASAN: use-after-free in ppp_unregister_channel+0x372/0x3a0 at
      addr ffff880064e217e0
      Read of size 8 by task syz-executor/11581
      =============================================================================
      BUG net_namespace (Not tainted): kasan: bad access detected
      -----------------------------------------------------------------------------
      
      Disabling lock debugging due to kernel taint
      INFO: Allocated in copy_net_ns+0x6b/0x1a0 age=92569 cpu=3 pid=6906
      [<      none      >] ___slab_alloc+0x4c7/0x500 kernel/mm/slub.c:2440
      [<      none      >] __slab_alloc+0x4c/0x90 kernel/mm/slub.c:2469
      [<     inline     >] slab_alloc_node kernel/mm/slub.c:2532
      [<     inline     >] slab_alloc kernel/mm/slub.c:2574
      [<      none      >] kmem_cache_alloc+0x23a/0x2b0 kernel/mm/slub.c:2579
      [<     inline     >] kmem_cache_zalloc kernel/include/linux/slab.h:597
      [<     inline     >] net_alloc kernel/net/core/net_namespace.c:325
      [<      none      >] copy_net_ns+0x6b/0x1a0 kernel/net/core/net_namespace.c:360
      [<      none      >] create_new_namespaces+0x2f6/0x610 kernel/kernel/nsproxy.c:95
      [<      none      >] copy_namespaces+0x297/0x320 kernel/kernel/nsproxy.c:150
      [<      none      >] copy_process.part.35+0x1bf4/0x5760 kernel/kernel/fork.c:1451
      [<     inline     >] copy_process kernel/kernel/fork.c:1274
      [<      none      >] _do_fork+0x1bc/0xcb0 kernel/kernel/fork.c:1723
      [<     inline     >] SYSC_clone kernel/kernel/fork.c:1832
      [<      none      >] SyS_clone+0x37/0x50 kernel/kernel/fork.c:1826
      [<      none      >] entry_SYSCALL_64_fastpath+0x16/0x7a kernel/arch/x86/entry/entry_64.S:185
      
      INFO: Freed in net_drop_ns+0x67/0x80 age=575 cpu=2 pid=2631
      [<      none      >] __slab_free+0x1fc/0x320 kernel/mm/slub.c:2650
      [<     inline     >] slab_free kernel/mm/slub.c:2805
      [<      none      >] kmem_cache_free+0x2a0/0x330 kernel/mm/slub.c:2814
      [<     inline     >] net_free kernel/net/core/net_namespace.c:341
      [<      none      >] net_drop_ns+0x67/0x80 kernel/net/core/net_namespace.c:348
      [<      none      >] cleanup_net+0x4e5/0x600 kernel/net/core/net_namespace.c:448
      [<      none      >] process_one_work+0x794/0x1440 kernel/kernel/workqueue.c:2036
      [<      none      >] worker_thread+0xdb/0xfc0 kernel/kernel/workqueue.c:2170
      [<      none      >] kthread+0x23f/0x2d0 kernel/drivers/block/aoe/aoecmd.c:1303
      [<      none      >] ret_from_fork+0x3f/0x70 kernel/arch/x86/entry/entry_64.S:468
      INFO: Slab 0xffffea0001938800 objects=3 used=0 fp=0xffff880064e20000
      flags=0x5fffc0000004080
      INFO: Object 0xffff880064e20000 @offset=0 fp=0xffff880064e24200
      
      CPU: 1 PID: 11581 Comm: syz-executor Tainted: G    B           4.4.0+
      Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
      rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014
       00000000ffffffff ffff8800662c7790 ffffffff8292049d ffff88003e36a300
       ffff880064e20000 ffff880064e20000 ffff8800662c77c0 ffffffff816f2054
       ffff88003e36a300 ffffea0001938800 ffff880064e20000 0000000000000000
      Call Trace:
       [<     inline     >] __dump_stack kernel/lib/dump_stack.c:15
       [<ffffffff8292049d>] dump_stack+0x6f/0xa2 kernel/lib/dump_stack.c:50
       [<ffffffff816f2054>] print_trailer+0xf4/0x150 kernel/mm/slub.c:654
       [<ffffffff816f875f>] object_err+0x2f/0x40 kernel/mm/slub.c:661
       [<     inline     >] print_address_description kernel/mm/kasan/report.c:138
       [<ffffffff816fb0c5>] kasan_report_error+0x215/0x530 kernel/mm/kasan/report.c:236
       [<     inline     >] kasan_report kernel/mm/kasan/report.c:259
       [<ffffffff816fb4de>] __asan_report_load8_noabort+0x3e/0x40 kernel/mm/kasan/report.c:280
       [<     inline     >] ? ppp_pernet kernel/include/linux/compiler.h:218
       [<ffffffff83ad71b2>] ? ppp_unregister_channel+0x372/0x3a0 kernel/drivers/net/ppp/ppp_generic.c:2392
       [<     inline     >] ppp_pernet kernel/include/linux/compiler.h:218
       [<ffffffff83ad71b2>] ppp_unregister_channel+0x372/0x3a0 kernel/drivers/net/ppp/ppp_generic.c:2392
       [<     inline     >] ? ppp_pernet kernel/drivers/net/ppp/ppp_generic.c:293
       [<ffffffff83ad6f26>] ? ppp_unregister_channel+0xe6/0x3a0 kernel/drivers/net/ppp/ppp_generic.c:2392
       [<ffffffff83ae18f3>] ppp_asynctty_close+0xa3/0x130 kernel/drivers/net/ppp/ppp_async.c:241
       [<ffffffff83ae1850>] ? async_lcp_peek+0x5b0/0x5b0 kernel/drivers/net/ppp/ppp_async.c:1000
       [<ffffffff82c33239>] tty_ldisc_close.isra.1+0x99/0xe0 kernel/drivers/tty/tty_ldisc.c:478
       [<ffffffff82c332c0>] tty_ldisc_kill+0x40/0x170 kernel/drivers/tty/tty_ldisc.c:744
       [<ffffffff82c34943>] tty_ldisc_release+0x1b3/0x260 kernel/drivers/tty/tty_ldisc.c:772
       [<ffffffff82c1ef21>] tty_release+0xac1/0x13e0 kernel/drivers/tty/tty_io.c:1901
       [<ffffffff82c1e460>] ? release_tty+0x320/0x320 kernel/drivers/tty/tty_io.c:1688
       [<ffffffff8174de36>] __fput+0x236/0x780 kernel/fs/file_table.c:208
       [<ffffffff8174e405>] ____fput+0x15/0x20 kernel/fs/file_table.c:244
       [<ffffffff813595ab>] task_work_run+0x16b/0x200 kernel/kernel/task_work.c:115
       [<     inline     >] exit_task_work kernel/include/linux/task_work.h:21
       [<ffffffff81307105>] do_exit+0x8b5/0x2c60 kernel/kernel/exit.c:750
       [<ffffffff813fdd20>] ? debug_check_no_locks_freed+0x290/0x290 kernel/kernel/locking/lockdep.c:4123
       [<ffffffff81306850>] ? mm_update_next_owner+0x6f0/0x6f0 kernel/kernel/exit.c:357
       [<ffffffff813215e6>] ? __dequeue_signal+0x136/0x470 kernel/kernel/signal.c:550
       [<ffffffff8132067b>] ? recalc_sigpending_tsk+0x13b/0x180 kernel/kernel/signal.c:145
       [<ffffffff81309628>] do_group_exit+0x108/0x330 kernel/kernel/exit.c:880
       [<ffffffff8132b9d4>] get_signal+0x5e4/0x14f0 kernel/kernel/signal.c:2307
       [<     inline     >] ? kretprobe_table_lock kernel/kernel/kprobes.c:1113
       [<ffffffff8151d355>] ? kprobe_flush_task+0xb5/0x450 kernel/kernel/kprobes.c:1158
       [<ffffffff8115f7d3>] do_signal+0x83/0x1c90 kernel/arch/x86/kernel/signal.c:712
       [<ffffffff8151d2a0>] ? recycle_rp_inst+0x310/0x310 kernel/include/linux/list.h:655
       [<ffffffff8115f750>] ? setup_sigcontext+0x780/0x780 kernel/arch/x86/kernel/signal.c:165
       [<ffffffff81380864>] ? finish_task_switch+0x424/0x5f0 kernel/kernel/sched/core.c:2692
       [<     inline     >] ? finish_lock_switch kernel/kernel/sched/sched.h:1099
       [<ffffffff81380560>] ? finish_task_switch+0x120/0x5f0 kernel/kernel/sched/core.c:2678
       [<     inline     >] ? context_switch kernel/kernel/sched/core.c:2807
       [<ffffffff85d794e9>] ? __schedule+0x919/0x1bd0 kernel/kernel/sched/core.c:3283
       [<ffffffff81003901>] exit_to_usermode_loop+0xf1/0x1a0 kernel/arch/x86/entry/common.c:247
       [<     inline     >] prepare_exit_to_usermode kernel/arch/x86/entry/common.c:282
       [<ffffffff810062ef>] syscall_return_slowpath+0x19f/0x210 kernel/arch/x86/entry/common.c:344
       [<ffffffff85d88022>] int_ret_from_sys_call+0x25/0x9f kernel/arch/x86/entry/entry_64.S:281
      Memory state around the buggy address:
       ffff880064e21680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
       ffff880064e21700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
      >ffff880064e21780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
       ffff880064e21800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
       ffff880064e21880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
      ==================================================================
      
      Fixes: 273ec51d ("net: ppp_generic - introduce net-namespace functionality v2")
      Reported-by: default avatarBaozeng Ding <sploving1@gmail.com>
      Signed-off-by: default avatarGuillaume Nault <g.nault@alphalink.fr>
      Reviewed-by: default avatarCyrill Gorcunov <gorcunov@openvz.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      6ab3a433
    • John Dahlstrom's avatar
      ideapad-laptop: Add ideapad Y700 (15) to the no_hw_rfkill DMI list · cc9a6f5b
      John Dahlstrom authored
      commit 4db9675d upstream.
      
      Some Lenovo ideapad models lack a physical rfkill switch.
      On Lenovo models ideapad Y700 Touch-15ISK and ideapad Y700-15ISK,
      ideapad-laptop would wrongly report all radios as blocked by
      hardware which caused wireless network connections to fail.
      
      Add these models without an rfkill switch to the no_hw_rfkill list.
      Signed-off-by: default avatarJohn Dahlstrom <jodarom@sdf.org>
      Signed-off-by: default avatarDarren Hart <dvhart@linux.intel.com>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      cc9a6f5b
    • Bobi Mihalca's avatar
      ALSA: hda - Apply fix for white noise on Asus N550JV, too · de1872f4
      Bobi Mihalca authored
      commit 83a9efb5 upstream.
      
      Apply the new fixup that is used for ASUS N750JV to another similar
      model, N500JV, too, for reducing the headphone noise.
      
      Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=115181Signed-off-by: default avatarBobi Mihalca <bobbymihalca@touchtech.ro>
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      de1872f4
    • Bobi Mihalca's avatar
      ALSA: hda - Fix white noise on Asus N750JV headphone · ce72835b
      Bobi Mihalca authored
      commit 9d4dc584 upstream.
      
      For reducing the noise from the headphone output on ASUS N750JV,
      call the existing fixup, alc_fixup_auto_mute_via_amp(), additionally.
      
      Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=115181Signed-off-by: default avatarBobi Mihalca <bobbymihalca@touchtech.ro>
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      ce72835b
    • Bobi Mihalca's avatar
      ALSA: hda - Asus N750JV external subwoofer fixup · 932f7bd3
      Bobi Mihalca authored
      commit 70cf2cbd upstream.
      
      ASUS N750JV needs the same fixup as N550 for enabling its subwoofer.
      
      Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=115181Signed-off-by: default avatarBobi Mihalca <bobbymihalca@touchtech.ro>
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      932f7bd3
    • Aurelien Jacquiot's avatar
      rapidio/rionet: fix deadlock on SMP · 4fedde54
      Aurelien Jacquiot authored
      commit 36915976 upstream.
      
      Fix deadlocking during concurrent receive and transmit operations on SMP
      platforms caused by the use of incorrect lock: on transmit 'tx_lock'
      spinlock should be used instead of 'lock' which is used for receive
      operation.
      
      This fix is applicable to kernel versions starting from v2.15.
      Signed-off-by: default avatarAurelien Jacquiot <a-jacquiot@ti.com>
      Signed-off-by: default avatarAlexandre Bounine <alexandre.bounine@idt.com>
      Cc: Matt Porter <mporter@kernel.crashing.org>
      Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      4fedde54
    • Jann Horn's avatar
      fs/coredump: prevent fsuid=0 dumps into user-controlled directories · b80e0e86
      Jann Horn authored
      commit 378c6520 upstream.
      
      This commit fixes the following security hole affecting systems where
      all of the following conditions are fulfilled:
      
       - The fs.suid_dumpable sysctl is set to 2.
       - The kernel.core_pattern sysctl's value starts with "/". (Systems
         where kernel.core_pattern starts with "|/" are not affected.)
       - Unprivileged user namespace creation is permitted. (This is
         true on Linux >=3.8, but some distributions disallow it by
         default using a distro patch.)
      
      Under these conditions, if a program executes under secure exec rules,
      causing it to run with the SUID_DUMP_ROOT flag, then unshares its user
      namespace, changes its root directory and crashes, the coredump will be
      written using fsuid=0 and a path derived from kernel.core_pattern - but
      this path is interpreted relative to the root directory of the process,
      allowing the attacker to control where a coredump will be written with
      root privileges.
      
      To fix the security issue, always interpret core_pattern for dumps that
      are written under SUID_DUMP_ROOT relative to the root directory of init.
      Signed-off-by: default avatarJann Horn <jann@thejh.net>
      Acked-by: default avatarKees Cook <keescook@chromium.org>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: "Eric W. Biederman" <ebiederm@xmission.com>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      [bwh: Backported to 3.16: adjust context]
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      b80e0e86
    • Steven Rostedt (Red Hat)'s avatar
      tracing: Fix trace_printk() to print when not using bprintk() · fcb91695
      Steven Rostedt (Red Hat) authored
      commit 3debb0a9 upstream.
      
      The trace_printk() code will allocate extra buffers if the compile detects
      that a trace_printk() is used. To do this, the format of the trace_printk()
      is saved to the __trace_printk_fmt section, and if that section is bigger
      than zero, the buffers are allocated (along with a message that this has
      happened).
      
      If trace_printk() uses a format that is not a constant, and thus something
      not guaranteed to be around when the print happens, the compiler optimizes
      the fmt out, as it is not used, and the __trace_printk_fmt section is not
      filled. This means the kernel will not allocate the special buffers needed
      for the trace_printk() and the trace_printk() will not write anything to the
      tracing buffer.
      
      Adding a "__used" to the variable in the __trace_printk_fmt section will
      keep it around, even though it is set to NULL. This will keep the string
      from being printed in the debugfs/tracing/printk_formats section as it is
      not needed.
      Reported-by: default avatarVlastimil Babka <vbabka@suse.cz>
      Fixes: 07d777fe "tracing: Add percpu buffers for trace_printk()"
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      fcb91695
    • Paolo Bonzini's avatar
      KVM: fix spin_lock_init order on x86 · 89c23ae1
      Paolo Bonzini authored
      commit e9ad4ec8 upstream.
      
      Moving the initialization earlier is needed in 4.6 because
      kvm_arch_init_vm is now using mmu_lock, causing lockdep to
      complain:
      
      [  284.440294] INFO: trying to register non-static key.
      [  284.445259] the code is fine but needs lockdep annotation.
      [  284.450736] turning off the locking correctness validator.
      ...
      [  284.528318]  [<ffffffff810aecc3>] lock_acquire+0xd3/0x240
      [  284.533733]  [<ffffffffa0305aa0>] ? kvm_page_track_register_notifier+0x20/0x60 [kvm]
      [  284.541467]  [<ffffffff81715581>] _raw_spin_lock+0x41/0x80
      [  284.546960]  [<ffffffffa0305aa0>] ? kvm_page_track_register_notifier+0x20/0x60 [kvm]
      [  284.554707]  [<ffffffffa0305aa0>] kvm_page_track_register_notifier+0x20/0x60 [kvm]
      [  284.562281]  [<ffffffffa02ece70>] kvm_mmu_init_vm+0x20/0x30 [kvm]
      [  284.568381]  [<ffffffffa02dbf7a>] kvm_arch_init_vm+0x1ea/0x200 [kvm]
      [  284.574740]  [<ffffffffa02bff3f>] kvm_dev_ioctl+0xbf/0x4d0 [kvm]
      
      However, it also helps fixing a preexisting problem, which is why this
      patch is also good for stable kernels: kvm_create_vm was incrementing
      current->mm->mm_count but not decrementing it at the out_err label (in
      case kvm_init_mmu_notifier failed).  The new initialization order makes
      it possible to add the required mmdrop without adding a new error label.
      Reported-by: default avatarBorislav Petkov <bp@alien8.de>
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      89c23ae1
    • Paolo Bonzini's avatar
      KVM: VMX: avoid guest hang on invalid invept instruction · 0b5b0458
      Paolo Bonzini authored
      commit 2849eb4f upstream.
      
      A guest executing an invalid invept instruction would hang
      because the instruction pointer was not updated.
      
      Fixes: bfd0a56bReviewed-by: default avatarDavid Matlack <dmatlack@google.com>
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      0b5b0458
    • Himanshu Madhani's avatar
      target: Fix target_release_cmd_kref shutdown comp leak · 34a20235
      Himanshu Madhani authored
      commit 5e47f198 upstream.
      
      This patch fixes an active I/O shutdown bug for fabric
      drivers using target_wait_for_sess_cmds(), where se_cmd
      descriptor shutdown would result in hung tasks waiting
      indefinitely for se_cmd->cmd_wait_comp to complete().
      
      To address this bug, drop the incorrect list_del_init()
      usage in target_wait_for_sess_cmds() and always complete()
      during se_cmd target_release_cmd_kref() put, in order to
      let caller invoke the final fabric release callback
      into se_cmd->se_tfo->release_cmd() code.
      Reported-by: default avatarHimanshu Madhani <himanshu.madhani@qlogic.com>
      Tested-by: default avatarHimanshu Madhani <himanshu.madhani@qlogic.com>
      Signed-off-by: default avatarHimanshu Madhani <himanshu.madhani@qlogic.com>
      Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      34a20235
    • Dan Carpenter's avatar
      mdio-sun4i: oops in error handling in probe · 1d5dd57e
      Dan Carpenter authored
      commit 227f33be upstream.
      
      We could end up dereferencing an error pointer when we call
      regulator_disable().
      
      Fixes: 4bdcb1dd ('net: Add MDIO bus driver for the Allwinner EMAC')
      Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
      Acked-by: default avatarChen-Yu Tsai <wens@csie.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      1d5dd57e
    • Peter Zijlstra's avatar
      bitops: Do not default to __clear_bit() for __clear_bit_unlock() · 75033f02
      Peter Zijlstra authored
      commit f75d4864 upstream.
      
      __clear_bit_unlock() is a special little snowflake. While it carries the
      non-atomic '__' prefix, it is specifically documented to pair with
      test_and_set_bit() and therefore should be 'somewhat' atomic.
      
      Therefore the generic implementation of __clear_bit_unlock() cannot use
      the fully non-atomic __clear_bit() as a default.
      
      If an arch is able to do better; is must provide an implementation of
      __clear_bit_unlock() itself.
      
      Specifically, this came up as a result of hackbench livelock'ing in
      slab_lock() on ARC with SMP + SLUB + !LLSC.
      
      The issue was incorrect pairing of atomic ops.
      
       slab_lock() -> bit_spin_lock() -> test_and_set_bit()
       slab_unlock() -> __bit_spin_unlock() -> __clear_bit()
      
      The non serializing __clear_bit() was getting "lost"
      
       80543b8e:	ld_s       r2,[r13,0] <--- (A) Finds PG_locked is set
       80543b90:	or         r3,r2,1    <--- (B) other core unlocks right here
       80543b94:	st_s       r3,[r13,0] <--- (C) sets PG_locked (overwrites unlock)
      
      Fixes ARC STAR 9000817404 (and probably more).
      Reported-by: default avatarVineet Gupta <Vineet.Gupta1@synopsys.com>
      Tested-by: default avatarVineet Gupta <Vineet.Gupta1@synopsys.com>
      Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Christoph Lameter <cl@linux.com>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Helge Deller <deller@gmx.de>
      Cc: James E.J. Bottomley <jejb@parisc-linux.org>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Noam Camus <noamc@ezchip.com>
      Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
      Cc: Pekka Enberg <penberg@kernel.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/20160309114054.GJ6356@twins.programming.kicks-ass.netSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      75033f02
    • Jesse Gross's avatar
      tunnels: Don't apply GRO to multiple layers of encapsulation. · 23cca87f
      Jesse Gross authored
      commit fac8e0f5 upstream.
      
      When drivers express support for TSO of encapsulated packets, they
      only mean that they can do it for one layer of encapsulation.
      Supporting additional levels would mean updating, at a minimum,
      more IP length fields and they are unaware of this.
      
      No encapsulation device expresses support for handling offloaded
      encapsulated packets, so we won't generate these types of frames
      in the transmit path. However, GRO doesn't have a check for
      multiple levels of encapsulation and will attempt to build them.
      
      UDP tunnel GRO actually does prevent this situation but it only
      handles multiple UDP tunnels stacked on top of each other. This
      generalizes that solution to prevent any kind of tunnel stacking
      that would cause problems.
      
      Fixes: bf5a755f ("net-gre-gro: Add GRE support to the GRO stack")
      Signed-off-by: default avatarJesse Gross <jesse@kernel.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      [bwh: Backported to 3.16:
       - Drop the ipip and sit cases
       - Adjust context]
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      23cca87f
    • Eric Dumazet's avatar
      net: bcmgenet: fix dma api length mismatch · 8c487c21
      Eric Dumazet authored
      commit eee57723 upstream.
      
      When un-mapping skb->data in __bcmgenet_tx_reclaim(),
      we must use the length that was used in original dma_map_single(),
      instead of skb->len that might be bigger (includes the frags)
      
      We simply can store skb_len into tx_cb_ptr->dma_len and use it
      at unmap time.
      
      Fixes: 1c1008c7 ("net: bcmgenet: add main driver file")
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Acked-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      [bwh: Backported to 3.16: adjust context]
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      8c487c21
    • Dan Carpenter's avatar
      ethernet: micrel: fix some error codes · 5c1e8c82
      Dan Carpenter authored
      commit 3af0d554 upstream.
      
      There were two issues here:
      1) dma_mapping_error() return true/false but we want to return -ENOMEM
      2) If dmaengine_prep_slave_sg() failed then "err" wasn't set but
         presumably that should be -ENOMEM as well.
      
      I changed the success path to "return 0;" instead of "return ret;" for
      clarity.
      
      Fixes: 94fe8c68 ('ks8842: Support DMA when accessed via timberdale')
      Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      5c1e8c82
    • Rabin Vincent's avatar
      splice: handle zero nr_pages in splice_to_pipe() · f482167d
      Rabin Vincent authored
      commit d6785d91 upstream.
      
      Running the following command:
      
       busybox cat /sys/kernel/debug/tracing/trace_pipe > /dev/null
      
      with any tracing enabled pretty very quickly leads to various NULL
      pointer dereferences and VM BUG_ON()s, such as these:
      
       BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
       IP: [<ffffffff8119df6c>] generic_pipe_buf_release+0xc/0x40
       Call Trace:
        [<ffffffff811c48a3>] splice_direct_to_actor+0x143/0x1e0
        [<ffffffff811c42e0>] ? generic_pipe_buf_nosteal+0x10/0x10
        [<ffffffff811c49cf>] do_splice_direct+0x8f/0xb0
        [<ffffffff81196869>] do_sendfile+0x199/0x380
        [<ffffffff81197600>] SyS_sendfile64+0x90/0xa0
        [<ffffffff8192cbee>] entry_SYSCALL_64_fastpath+0x12/0x6d
      
       page dumped because: VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0)
       kernel BUG at include/linux/mm.h:367!
       invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
       RIP: [<ffffffff8119df9c>] generic_pipe_buf_release+0x3c/0x40
       Call Trace:
        [<ffffffff811c48a3>] splice_direct_to_actor+0x143/0x1e0
        [<ffffffff811c42e0>] ? generic_pipe_buf_nosteal+0x10/0x10
        [<ffffffff811c49cf>] do_splice_direct+0x8f/0xb0
        [<ffffffff81196869>] do_sendfile+0x199/0x380
        [<ffffffff81197600>] SyS_sendfile64+0x90/0xa0
        [<ffffffff8192cd1e>] tracesys_phase2+0x84/0x89
      
      (busybox's cat uses sendfile(2), unlike the coreutils version)
      
      This is because tracing_splice_read_pipe() can call splice_to_pipe()
      with spd->nr_pages == 0.  spd_pages underflows in splice_to_pipe() and
      we fill the page pointers and the other fields of the pipe_buffers with
      garbage.
      
      All other callers of splice_to_pipe() avoid calling it when nr_pages ==
      0, and we could make tracing_splice_read_pipe() do that too, but it
      seems reasonable to have splice_to_page() handle this condition
      gracefully.
      Signed-off-by: default avatarRabin Vincent <rabin@rab.in>
      Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      f482167d
    • Steven Rostedt (Red Hat)'s avatar
      tracing: Fix crash from reading trace_pipe with sendfile · 906dbf0d
      Steven Rostedt (Red Hat) authored
      commit a29054d9 upstream.
      
      If tracing contains data and the trace_pipe file is read with sendfile(),
      then it can trigger a NULL pointer dereference and various BUG_ON within the
      VM code.
      
      There's a patch to fix this in the splice_to_pipe() code, but it's also a
      good idea to not let that happen from trace_pipe either.
      
      Link: http://lkml.kernel.org/r/1457641146-9068-1-git-send-email-rabin@rab.inReported-by: default avatarRabin Vincent <rabin.vincent@gmail.com>
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      906dbf0d
    • Arnd Bergmann's avatar
      lpfc: fix misleading indentation · 5083db77
      Arnd Bergmann authored
      commit aeb6641f upstream.
      
      gcc-6 complains about the indentation of the lpfc_destroy_vport_work_array()
      call in lpfc_online(), which clearly doesn't look right:
      
      drivers/scsi/lpfc/lpfc_init.c: In function 'lpfc_online':
      drivers/scsi/lpfc/lpfc_init.c:2880:3: warning: statement is indented as if it were guarded by... [-Wmisleading-indentation]
         lpfc_destroy_vport_work_array(phba, vports);
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      drivers/scsi/lpfc/lpfc_init.c:2863:2: note: ...this 'if' clause, but it is not
        if (vports != NULL)
        ^~
      
      Looking at the patch that introduced this code, it's clear that the
      behavior is correct and the indentation is wrong.
      
      This fixes the indentation and adds curly braces around the previous
      if() block for clarity, as that is most likely what caused the code
      to be misindented in the first place.
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Fixes: 549e55cd ("[SCSI] lpfc 8.2.2 : Fix locking around HBA's port_list")
      Reviewed-by: default avatarSebastian Herbszt <herbszt@gmx.de>
      Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
      Reviewed-by: default avatarEwan D. Milne <emilne@redhat.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      5083db77
    • Steven Rostedt (Red Hat)'s avatar
      tracing: Have preempt(irqs)off trace preempt disabled functions · 5c89986e
      Steven Rostedt (Red Hat) authored
      commit cb86e053 upstream.
      
      Joel Fernandes reported that the function tracing of preempt disabled
      sections was not being reported when running either the preemptirqsoff or
      preemptoff tracers. This was due to the fact that the function tracer
      callback for those tracers checked if irqs were disabled before tracing. But
      this fails when we want to trace preempt off locations as well.
      
      Joel explained that he wanted to see funcitons where interrupts are enabled
      but preemption was disabled. The expected output he wanted:
      
         <...>-2265    1d.h1 3419us : preempt_count_sub <-irq_exit
         <...>-2265    1d..1 3419us : __do_softirq <-irq_exit
         <...>-2265    1d..1 3419us : msecs_to_jiffies <-__do_softirq
         <...>-2265    1d..1 3420us : irqtime_account_irq <-__do_softirq
         <...>-2265    1d..1 3420us : __local_bh_disable_ip <-__do_softirq
         <...>-2265    1..s1 3421us : run_timer_softirq <-__do_softirq
         <...>-2265    1..s1 3421us : hrtimer_run_pending <-run_timer_softirq
         <...>-2265    1..s1 3421us : _raw_spin_lock_irq <-run_timer_softirq
         <...>-2265    1d.s1 3422us : preempt_count_add <-_raw_spin_lock_irq
         <...>-2265    1d.s2 3422us : _raw_spin_unlock_irq <-run_timer_softirq
         <...>-2265    1..s2 3422us : preempt_count_sub <-_raw_spin_unlock_irq
         <...>-2265    1..s1 3423us : rcu_bh_qs <-__do_softirq
         <...>-2265    1d.s1 3423us : irqtime_account_irq <-__do_softirq
         <...>-2265    1d.s1 3423us : __local_bh_enable <-__do_softirq
      
      There's a comment saying that the irq disabled check is because there's a
      possible race that tracing_cpu may be set when the function is executed. But
      I don't remember that race. For now, I added a check for preemption being
      enabled too to not record the function, as there would be no race if that
      was the case. I need to re-investigate this, as I'm now thinking that the
      tracing_cpu will always be correct. But no harm in keeping the check for
      now, except for the slight performance hit.
      
      Link: http://lkml.kernel.org/r/1457770386-88717-1-git-send-email-agnel.joel@gmail.com
      
      Fixes: 5e6d2b9c "tracing: Use one prologue for the preempt irqs off tracer function tracers"
      Cc: stable@vget.kernel.org # 2.6.37+
      Reported-by: default avatarJoel Fernandes <agnel.joel@gmail.com>
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      5c89986e
    • Hans de Goede's avatar
      USB: uas: Reduce can_queue to MAX_CMNDS · 2e79fd3e
      Hans de Goede authored
      commit 55ff8cfb upstream.
      
      The uas driver can never queue more then MAX_CMNDS (- 1) tags and tags
      are shared between luns, so there is no need to claim that we can_queue
      some random large number.
      
      Not claiming that we can_queue 65536 commands, fixes the uas driver
      failing to initialize while allocating the tag map with a "Page allocation
      failure (order 7)" error on systems which have been running for a while
      and thus have fragmented memory.
      Reported-and-tested-by: default avatarYves-Alexis Perez <corsac@corsac.net>
      Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      [bwh: Backported to 3.16: add definition of MAX_CMNDS from upstream commit
       5e61aede ("uas: Do not use scsi_host_find_tag")]
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      2e79fd3e
    • Oliver Neukum's avatar
      USB: usb_driver_claim_interface: add sanity checking · 81a64abc
      Oliver Neukum authored
      commit 0b818e39 upstream.
      
      Attacks that trick drivers into passing a NULL pointer
      to usb_driver_claim_interface() using forged descriptors are
      known. This thwarts them by sanity checking.
      Signed-off-by: default avatarOliver Neukum <ONeukum@suse.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      81a64abc
    • Dave Jones's avatar
      x86/apic: Fix suspicious RCU usage in smp_trace_call_function_interrupt() · 0a72e125
      Dave Jones authored
      commit 7834c103 upstream.
      
      Since 4.4, I've been able to trigger this occasionally:
      
      ===============================
      [ INFO: suspicious RCU usage. ]
      4.5.0-rc7-think+ #3 Not tainted
      Cc: Andi Kleen <ak@linux.intel.com>
      Link: http://lkml.kernel.org/r/20160315012054.GA17765@codemonkey.org.ukSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      
      -------------------------------
      ./arch/x86/include/asm/msr-trace.h:47 suspicious rcu_dereference_check() usage!
      
      other info that might help us debug this:
      
      RCU used illegally from idle CPU!
      rcu_scheduler_active = 1, debug_locks = 1
      RCU used illegally from extended quiescent state!
      no locks held by swapper/3/0.
      
      stack backtrace:
      CPU: 3 PID: 0 Comm: swapper/3 Not tainted 4.5.0-rc7-think+ #3
       ffffffff92f821e0 1f3e5c340597d7fc ffff880468e07f10 ffffffff92560c2a
       ffff880462145280 0000000000000001 ffff880468e07f40 ffffffff921376a6
       ffffffff93665ea0 0000cc7c876d28da 0000000000000005 ffffffff9383dd60
      Call Trace:
       <IRQ>  [<ffffffff92560c2a>] dump_stack+0x67/0x9d
       [<ffffffff921376a6>] lockdep_rcu_suspicious+0xe6/0x100
       [<ffffffff925ae7a7>] do_trace_write_msr+0x127/0x1a0
       [<ffffffff92061c83>] native_apic_msr_eoi_write+0x23/0x30
       [<ffffffff92054408>] smp_trace_call_function_interrupt+0x38/0x360
       [<ffffffff92d1ca60>] trace_call_function_interrupt+0x90/0xa0
       <EOI>  [<ffffffff92ac5124>] ? cpuidle_enter_state+0x1b4/0x520
      
      Move the entering_irq() call before ack_APIC_irq(), because entering_irq()
      tells the RCU susbstems to end the extended quiescent state, so that the
      following trace call in ack_APIC_irq() works correctly.
      Suggested-by: default avatarAndi Kleen <ak@linux.intel.com>
      Fixes: 4787c368 "x86/tracing: Add irq_enter/exit() in smp_trace_reschedule_interrupt()"
      Signed-off-by: default avatarDave Jones <davej@codemonkey.org.uk>
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      0a72e125
    • Benjamin Tissoires's avatar
      Input: synaptics - handle spurious release of trackstick buttons, again · c2f63f03
      Benjamin Tissoires authored
      commit 82be788c upstream.
      
      Looks like the fimware 8.2 still has the extra buttons spurious release
      bug.
      
      Link: https://bugzilla.kernel.org/show_bug.cgi?id=114321Signed-off-by: default avatarBenjamin Tissoires <benjamin.tissoires@redhat.com>
      Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      c2f63f03
    • Oliver Neukum's avatar
      Input: ims-pcu - sanity check against missing interfaces · 2b1d2df1
      Oliver Neukum authored
      commit a0ad220c upstream.
      
      A malicious device missing interface can make the driver oops.
      Add sanity checking.
      Signed-off-by: default avatarOliver Neukum <ONeukum@suse.com>
      Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      2b1d2df1
    • NeilBrown's avatar
      sunrpc/cache: drop reference when sunrpc_cache_pipe_upcall() detects a race · 503d7377
      NeilBrown authored
      commit a6ab1e81 upstream.
      
      sunrpc_cache_pipe_upcall() can detect a race if CACHE_PENDING is no longer
      set.  In this case it aborts the queuing of the upcall.
      However it has already taken a new counted reference on "h" and
      doesn't "put" it, even though it frees the data structure holding the reference.
      
      So let's delay the "cache_get" until we know we need it.
      
      Fixes: f9e1aedc ("sunrpc/cache: remove races with queuing an upcall.")
      Signed-off-by: default avatarNeilBrown <neilb@suse.com>
      Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      503d7377
    • Andy Lutomirski's avatar
      x86/iopl: Fix iopl capability check on Xen PV · a4950109
      Andy Lutomirski authored
      commit c29016cf upstream.
      
      iopl(3) is supposed to work if iopl is already 3, even if
      unprivileged.  This didn't work right on Xen PV.  Fix it.
      Reviewewd-by: default avatarJan Beulich <JBeulich@suse.com>
      Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
      Cc: Andrew Cooper <andrew.cooper3@citrix.com>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: David Vrabel <david.vrabel@citrix.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Jan Beulich <JBeulich@suse.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/8ce12013e6e4c0a44a97e316be4a6faff31bd5ea.1458162709.git.luto@kernel.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      a4950109
    • Guillaume Nault's avatar
      ppp: ensure file->private_data can't be overridden · 031a3cd4
      Guillaume Nault authored
      commit e8e56ffd upstream.
      
      Locking ppp_mutex must be done before dereferencing file->private_data,
      otherwise it could be modified before ppp_unattached_ioctl() takes the
      lock. This could lead ppp_unattached_ioctl() to override ->private_data,
      thus leaking reference to the ppp_file previously pointed to.
      
      v2: lock all ppp_ioctl() instead of just checking private_data in
          ppp_unattached_ioctl(), to avoid ambiguous behaviour.
      
      Fixes: f3ff8a4d ("ppp: push BKL down into the driver")
      Signed-off-by: default avatarGuillaume Nault <g.nault@alphalink.fr>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      031a3cd4
    • Dmitry V. Levin's avatar
      vfs: show_vfsstat: do not ignore errors from show_devname method · 31a055ab
      Dmitry V. Levin authored
      commit 5f8d498d upstream.
      
      Explicitly check show_devname method return code and bail out in case
      of an error.  This fixes regression introduced by commit 9d4d6574.
      Signed-off-by: default avatarDmitry V. Levin <ldv@altlinux.org>
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      [bwh: Backported to 3.16: add the 'out' label]
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      31a055ab
    • J. Bruce Fields's avatar
      nfsd: fix deadlock secinfo+readdir compound · a34207e9
      J. Bruce Fields authored
      commit 2f6fc056 upstream.
      
      nfsd_lookup_dentry exits with the parent filehandle locked.  fh_put also
      unlocks if necessary (nfsd filehandle locking is probably too lenient),
      so it gets unlocked eventually, but if the following op in the compound
      needs to lock it again, we can deadlock.
      
      A fuzzer ran into this; normal clients don't send a secinfo followed by
      a readdir in the same compound.
      Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
      [bwh: Backported to 3.16: adjust context]
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      a34207e9
    • Geert Uytterhoeven's avatar
      gpiolib: Fix comment referring to gpio_*() in gpiod_*() · 738b5be4
      Geert Uytterhoeven authored
      commit 1cfab8f8 upstream.
      
      Fixes: 79a9becd ("gpiolib: export descriptor-based GPIO interface")
      Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
      Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
      [bwh: Backported to 3.16: adjust context]
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      738b5be4
    • Arnd Bergmann's avatar
      paride: make 'verbose' parameter an 'int' again · 66435e4b
      Arnd Bergmann authored
      commit dec63a4d upstream.
      
      gcc-6.0 found an ancient bug in the paride driver, which had a
      "module_param(verbose, bool, 0);" since before 2.6.12, but actually uses
      it to accept '0', '1' or '2' as arguments:
      
        drivers/block/paride/pd.c: In function 'pd_init_dev_parms':
        drivers/block/paride/pd.c:298:29: warning: comparison of constant '1' with boolean expression is always false [-Wbool-compare]
         #define DBMSG(msg) ((verbose>1)?(msg):NULL)
      
      In 2012, Rusty did a cleanup patch that also changed the type of the
      variable to 'bool', which introduced what is now a gcc warning.
      
      This changes the type back to 'int' and adapts the module_param() line
      instead, so it should work as documented in case anyone ever cares about
      running the ancient driver with debugging.
      
      Fixes: 90ab5ee9 ("module_param: make bool parameters really bool (drivers & misc)")
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Rusty Russell <rusty@rustcorp.com.au>
      Cc: Tim Waugh <tim@cyberelk.net>
      Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
      Cc: Jens Axboe <axboe@fb.com>
      Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      66435e4b
    • Takashi Iwai's avatar
      ALSA: hda - Fix unconditional GPIO toggle via automute · 0afdf69b
      Takashi Iwai authored
      commit 1f7c6658 upstream.
      
      Cirrus HD-audio driver may adjust GPIO pins for EAPD dynamically
      depending on the jack plug state.  This works fine for the auto-mute
      mode where the speaker gets muted upon the HP jack plug.   OTOH, when
      the auto-mute mode is off, this turns off the EAPD unexpectedly
      depending on the jack state, which results in the silent speaker
      output.
      
      This patch fixes the silent speaker output issue by setting GPIO bits
      constantly when the auto-mute mode is off.
      
      Reported-and-tested-by: moosotc@gmail.com
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      0afdf69b