- 13 Jan, 2021 3 commits
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Andrii Nakryiko authored
Add support for searching for ksym externs not just in vmlinux BTF, but across all module BTFs, similarly to how it's done for CO-RE relocations. Kernels that expose module BTFs through sysfs are assumed to support new ldimm64 instruction extension with BTF FD provided in insn[1].imm field, so no extra feature detection is performed. Signed-off-by:
Andrii Nakryiko <andrii@kernel.org> Signed-off-by:
Alexei Starovoitov <ast@kernel.org> Acked-by:
Yonghong Song <yhs@fb.com> Acked-by:
Hao Luo <haoluo@google.com> Link: https://lore.kernel.org/bpf/20210112075520.4103414-7-andrii@kernel.org
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Andrii Nakryiko authored
Add support for directly accessing kernel module variables from BPF programs using special ldimm64 instructions. This functionality builds upon vmlinux ksym support, but extends ldimm64 with src_reg=BPF_PSEUDO_BTF_ID to allow specifying kernel module BTF's FD in insn[1].imm field. During BPF program load time, verifier will resolve FD to BTF object and will take reference on BTF object itself and, for module BTFs, corresponding module as well, to make sure it won't be unloaded from under running BPF program. The mechanism used is similar to how bpf_prog keeps track of used bpf_maps. One interesting change is also in how per-CPU variable is determined. The logic is to find .data..percpu data section in provided BTF, but both vmlinux and module each have their own .data..percpu entries in BTF. So for module's case, the search for DATASEC record needs to look at only module's added BTF types. This is implemented with custom search function. Signed-off-by:
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Andrii Nakryiko authored
If some of the subtests use module BTFs through ksyms, they will cause bpf_prog to take a refcount on bpf_testmod module, which will prevent it from successfully unloading. Module's refcnt is decremented when bpf_prog is freed, which generally happens in RCU callback. So we need to trigger syncronize_rcu() in the kernel, which can be achieved nicely with membarrier(MEMBARRIER_CMD_SHARED) or membarrier(MEMBARRIER_CMD_GLOBAL) syscall. So do that in kernel_sync_rcu() and make it available to other test inside the test_progs. This synchronize_rcu() is called before attempting to unload bpf_testmod. Fixes: 9f7fa225 ("selftests/bpf: Add bpf_testmod kernel module for testing") Suggested-by:
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- 12 Jan, 2021 7 commits
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Andrii Nakryiko authored
__bpf_free_used_maps() is always defined in kernel/bpf/core.c, while include/linux/bpf.h is guarding it behind CONFIG_BPF_SYSCALL. Move it out of that guard region and fix compiler warning. Fixes: a2ea0746 ("bpf: Fix missing prog untrack in release_maps") Reported-by:
kernel test robot <lkp@intel.com> Signed-off-by:
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Andrii Nakryiko authored
BPF interpreter uses extra input argument, so re-casts __bpf_call_base into __bpf_call_base_args. Avoid compiler warning about incompatible function prototypes by casting to void * first. Fixes: 1ea47e01 ("bpf: add support for bpf_call to interpreter") Reported-by:
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Andrii Nakryiko authored
Add bpf_patch_call_args() prototype. This function is called from BPF verifier and only if CONFIG_BPF_JIT_ALWAYS_ON is not defined. This fixes compiler warning about missing prototype in some kernel configurations. Fixes: 1ea47e01 ("bpf: add support for bpf_call to interpreter") Reported-by:
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Daniel Borkmann authored
Extend existing cgroup bind4/bind6 tests to add coverage for setting and retrieving SO_MARK, SO_PRIORITY and SO_BINDTOIFINDEX at the bind hook. Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Signed-off-by:
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Daniel Borkmann authored
The _bpf_setsockopt() is able to set some of the SOL_SOCKET level options, however, _bpf_getsockopt() has little support to actually retrieve them. This small patch adds few misc options such as SO_MARK, SO_PRIORITY and SO_BINDTOIFINDEX. For the latter getter and setter are added. The mark and priority in particular allow to retrieve the options from BPF cgroup hooks to then implement custom behavior / settings on the syscall hooks compared to other sockets that stick to the defaults, for example. Signed-off-by:
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Brendan Jackman authored
The error message here is misleading, the argument will be rejected unless it is a known constant. Signed-off-by:
Brendan Jackman <jackmanb@google.com> Signed-off-by:
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Brendan Jackman authored
When the buffer is too small to contain the input string, these helpers return the length of the buffer, not the length of the original string. This tries to make the docs totally clear about that, since "the length of the [copied ]string" could also refer to the length of the input. Signed-off-by:
KP Singh <kpsingh@kernel.org> Acked-by:
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- 08 Jan, 2021 30 commits
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Andrii Nakryiko authored
Add comments clarifying that USER variants of CO-RE reading macro are still only going to work with kernel types, defined in kernel or kernel module BTF. This should help preventing invalid use of those macro to read user-defined types (which doesn't work with CO-RE). Signed-off-by:
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Menglong Dong authored
'unistd.h' included in 'selftests/bpf/prog_tests/test_lsm.c' is duplicated. Signed-off-by:
Menglong Dong <dong.menglong@zte.com.cn> Signed-off-by:
Martin KaFai Lau <kafai@fb.com> Link: https://lore.kernel.org/bpf/20210105152047.6070-1-dong.menglong@zte.com.cnSigned-off-by:
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Lorenzo Bianconi authored
Introduce xdp_prepare_buff utility routine to initialize per-descriptor xdp_buff fields (e.g. xdp_buff pointers). Rely on xdp_prepare_buff() in all XDP capable drivers. Signed-off-by:
Lorenzo Bianconi <lorenzo@kernel.org> Signed-off-by:
Alexander Duyck <alexanderduyck@fb.com> Acked-by:
Jesper Dangaard Brouer <brouer@redhat.com> Acked-by:
John Fastabend <john.fastabend@gmail.com> Acked-by:
Shay Agroskin <shayagr@amazon.com> Acked-by:
Martin Habets <habetsm.xilinx@gmail.com> Acked-by:
Camelia Groza <camelia.groza@nxp.com> Acked-by:
Marcin Wojtas <mw@semihalf.com> Link: https://lore.kernel.org/bpf/45f46f12295972a97da8ca01990b3e71501e9d89.1608670965.git.lorenzo@kernel.orgSigned-off-by:
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Lorenzo Bianconi authored
Introduce xdp_init_buff utility routine to initialize xdp_buff fields const over NAPI iterations (e.g. frame_sz or rxq pointer). Rely on xdp_init_buff in all XDP capable drivers. Signed-off-by:
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Zheng Yongjun authored
The function sockfd_lookup uses fget on the value that is stored in the file field of the returned structure, so fput should ultimately be applied to this value. This can be done directly, but it seems better to use the specific macro sockfd_put, which does the same thing. The cleanup was done using the following semantic patch: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @@ expression s; @@ s = sockfd_lookup(...) ... + sockfd_put(s); ?- fput(s->file); // </smpl> Signed-off-by:Zheng Yongjun <zhengyongjun3@huawei.com> Signed-off-by:
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Leah Neukirchen authored
This program does not use argp (which is a glibcism). Instead include <errno.h> directly, which was pulled in by <argp.h>. Signed-off-by:
Leah Neukirchen <leah@vuxu.org> Signed-off-by:
Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/20201216100306.30942-1-leah@vuxu.orgSigned-off-by:
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Andrii Nakryiko authored
Add selftests validating that newly added variations of BPF_CORE_READ(), for use with user-space addresses and for non-CO-RE reads, work as expected. Signed-off-by:
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Andrii Nakryiko authored
BPF_CORE_READ(), in addition to handling CO-RE relocations, also allows much nicer way to read data structures with nested pointers. Instead of writing a sequence of bpf_probe_read() calls to follow links, one can just write BPF_CORE_READ(a, b, c, d) to effectively do a->b->c->d read. This is a welcome ability when porting BCC code, which (in most cases) allows exactly the intuitive a->b->c->d variant. This patch adds non-CO-RE variants of BPF_CORE_READ() family of macros for cases where CO-RE is not supported (e.g., old kernels). In such cases, the property of shortening a sequence of bpf_probe_read()s to a simple BPF_PROBE_READ(a, b, c, d) invocation is still desirable, especially when porting BCC code to libbpf. Yet, no CO-RE relocation is going to be emitted. Signed-off-by:
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Andrii Nakryiko authored
Add BPF_CORE_READ_USER(), BPF_CORE_READ_USER_STR() and their _INTO() variations to allow reading CO-RE-relocatable kernel data structures from the user-space. One of such cases is reading input arguments of syscalls, while reaping the benefits of CO-RE relocations w.r.t. handling 32/64 bit conversions and handling missing/new fields in UAPI data structs. Suggested-by:
Gilad Reti <gilad.reti@gmail.com> Signed-off-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski authored
Trivial conflict in CAN on file rename. Conflicts: drivers/net/can/m_can/tcan4x5x-core.c Signed-off-by:Jakub Kicinski <kuba@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netLinus Torvalds authored
Pull more networking fixes from Jakub Kicinski: "Slightly lighter pull request to get back into the Thursday cadence. Current release - always broken: - can: mcp251xfd: fix Tx/Rx ring buffer driver race conditions - dsa: hellcreek: fix led_classdev build errors Previous releases - regressions: - ipv6: fib: flush exceptions when purging route to avoid netdev reference leak - ip_tunnels: fix pmtu check in nopmtudisc mode - ip: always refragment ip defragmented packets to avoid MTU issues when forwarding through tunnels, correct "packet too big" message is prohibitively tricky to generate - s390/qeth: fix locking for discipline setup / removal and during recovery to prevent both deadlocks and races - mlx5: Use port_num 1 instead of 0 when delete a RoCE address Previous releases - always broken: - cdc_ncm: correct overhead calculation in delayed_ndp_size to prevent out of bound accesses with Huawei 909s-120 LTE module - fix stmmac dwmac-sun8i suspend/resume: - PHY being left powered off - MAC syscon configuration being reset - reference to the reset controller being improperly dropped - qrtr: fix null-ptr-deref in qrtr_ns_remove - can: tcan4x5x: fix bittiming const, use common bittiming from m_can driver - mlx5e: CT: Use per flow counter when CT flow accounting is enabled - mlx5e: Fix SWP offsets when vlan inserted by driver Misc: - bpf: Fix a task_iter bug caused by a bpf -> net merge conflict resolution And the usual many fixes to various error paths" * tag 'net-5.11-rc3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (69 commits) net: dsa: lantiq_gswip: Exclude RMII from modes that report 1 GbE s390/qeth: fix L2 header access in qeth_l3_osa_features_check() s390/qeth: fix locking for discipline setup / removal s390/qeth: fix deadlock during recovery selftests: fib_nexthops: Fix wrong mausezahn invocation nexthop: Bounce NHA_GATEWAY in FDB nexthop groups nexthop: Unlink nexthop group entry in error path nexthop: Fix off-by-one error in error path octeontx2-af: fix memory leak of lmac and lmac->name chtls: Fix chtls resources release sequence chtls: Added a check to avoid NULL pointer dereference chtls: Replace skb_dequeue with skb_peek chtls: Avoid unnecessary freeing of oreq pointer chtls: Fix panic when route to peer not configured chtls: Remove invalid set_tcb call chtls: Fix hardware tid leak net: ip: always refragment ip defragmented packets net: fix pmtu check in nopmtudisc mode selftests: netfilter: add selftest for ipip pmtu discovery with enabled connection tracking docs: octeontx2: tune rst markup ... -
git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6Linus Torvalds authored
Pull crypto fixes from Herbert Xu: "This fixes a functional bug in arm/chacha-neon as well as a potential buffer overflow in ecdh" * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: crypto: ecdh - avoid buffer overflow in ecdh_set_secret() crypto: arm/chacha-neon - add missing counter increment
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Linus Torvalds authored
The kernel test robot reported a -5.8% performance regression on the "poll2" test of will-it-scale, and bisected it to commit d55564cf ("x86: Make __put_user() generate an out-of-line call"). I didn't expect an out-of-line __put_user() to matter, because no normal core code should use that non-checking legacy version of user access any more. But I had overlooked the very odd poll() usage, which does a __put_user() to update the 'revents' values of the poll array. Now, Al Viro correctly points out that instead of updating just the 'revents' field, it would be much simpler to just copy the _whole_ pollfd entry, and then we could just use "copy_to_user()" on the whole array of entries, the same way we use "copy_from_user()" a few lines earlier to get the original values. But that is not what we've traditionally done, and I worry that threaded applications might be concurrently modifying the other fields of the pollfd array. So while Al's suggestion is simpler - and perhaps worth trying in the future - this instead keeps the "just update revents" model. To fix the performance regression, use the modern "unsafe_put_user()" instead of __put_user(), with the proper "user_write_access_begin()" guarding in place. This improves code generation enormously. Link: https://lore.kernel.org/lkml/20210107134723.GA28532@xsang-OptiPlex-9020/Reported-by:
kernel test robot <oliver.sang@intel.com> Tested-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Petr Mladek authored
This reverts commit 757055ae. The commit caused that ttynull was used as the default console on several systems[1][2][3]. As a result, the console was blank even when a better alternative existed. It happened when there was no console configured on the command line and ttynull_init() was the first initcall calling register_console(). Or it happened when /dev/ did not exist when console_on_rootfs() was called. It was not able to open /dev/console even though a console driver was registered. It tried to add ttynull console but it obviously did not help. But ttynull became the preferred console and was used by /dev/console when it was available later. The commit tried to fix a historical problem that have been there for ages. The primary motivation was the commit 3cffa06a ("printk/console: Allow to disable console output by using console="" or console=null"). It provided a clean solution for a workaround that was widely used and worked only by chance. This revert causes that the console="" or console=null command line options will again work only by chance. These options will cause that a particular console will be preferred and the default (tty) ones will not get enabled. There will be no console registered at all. As a result there won't be stdin, stdout, and stderr for the init process. But it worked exactly this way even before. The proper solution has to fulfill many conditions: + Register ttynull only when explicitly required or as the ultimate fallback. + ttynull should get associated with /dev/console but it must not become preferred console when used as a fallback. Especially, it must still be possible to replace it by a better console later. Such a change requires clean up of the register_console() code. Otherwise, it would be even harder to follow. Especially, the use of has_preferred_console and CON_CONSDEV flag is tricky. The clean up is risky. The ordering of consoles is not well defined. And any changes tend to break existing user settings. Do the revert at the least risky solution for now. [1] https://lore.kernel.org/linux-kselftest/20201221144302.GR4077@smile.fi.intel.com/ [2] https://lore.kernel.org/lkml/d2a3b3c0-e548-7dd1-730f-59bc5c04e191@synopsys.com/ [3] https://patchwork.ozlabs.org/project/linux-um/patch/20210105120128.10854-1-thomas@m3y3r.de/Reported-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reported-by:
Vineet Gupta <vgupta@synopsys.com> Reported-by:
Thomas Meyer <thomas@m3y3r.de> Signed-off-by:
Petr Mladek <pmladek@suse.com> Acked-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by:
Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linuxJakub Kicinski authored
Saeed Mahameed says: ==================== mlx5 fixes 2021-01-07 * tag 'mlx5-fixes-2021-01-07' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux: net/mlx5e: Fix memleak in mlx5e_create_l2_table_groups net/mlx5e: Fix two double free cases net/mlx5: Release devlink object if adev fails net/mlx5e: ethtool, Fix restriction of autoneg with 56G net/mlx5e: In skb build skip setting mark in switchdev mode net/mlx5: E-Switch, fix changing vf VLANID net/mlx5e: Fix SWP offsets when vlan inserted by driver net/mlx5e: CT: Use per flow counter when CT flow accounting is enabled net/mlx5: Use port_num 1 instead of 0 when delete a RoCE address net/mlx5e: Add missing capability check for uplink follow net/mlx5: Check if lag is supported before creating one ==================== Link: https://lore.kernel.org/r/20210107202845.470205-1-saeed@kernel.orgSigned-off-by:
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Aleksander Jan Bajkowski authored
Exclude RMII from modes that report 1 GbE support. Reduced MII supports up to 100 MbE. Fixes: 14fceff4 ("net: dsa: Add Lantiq / Intel DSA driver for vrx200") Signed-off-by:
Aleksander Jan Bajkowski <olek2@wp.pl> Reviewed-by:
Florian Fainelli <f.fainelli@gmail.com> Link: https://lore.kernel.org/r/20210107195818.3878-1-olek2@wp.plSigned-off-by:
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Jakub Kicinski authored
Julian Wiedmann says: ==================== s390/qeth: fixes 2021-01-07 This brings two locking fixes for the device control path. Also one fix for a path where our .ndo_features_check() attempts to access a non-existent L2 header. ==================== Link: https://lore.kernel.org/r/20210107172442.1737-1-jwi@linux.ibm.comSigned-off-by:
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Julian Wiedmann authored
ip_finish_output_gso() may call .ndo_features_check() even before the skb has a L2 header. This conflicts with qeth_get_ip_version()'s attempt to inspect the L2 header via vlan_eth_hdr(). Switch to vlan_get_protocol(), as already used further down in the common qeth_features_check() path. Fixes: f13ade19 ("s390/qeth: run non-offload L3 traffic over common xmit path") Signed-off-by:
Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by:
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Julian Wiedmann authored
Due to insufficient locking, qeth_core_set_online() and qeth_dev_layer2_store() can run in parallel, both attempting to load & setup the discipline (and stepping on each other toes along the way). A similar race can also occur between qeth_core_remove_device() and qeth_dev_layer2_store(). Access to .discipline is meant to be protected by the discipline_mutex, so add/expand the locking in qeth_core_remove_device() and qeth_core_set_online(). Adjust the locking in qeth_l*_remove_device() accordingly, as it's now handled by the callers in a consistent manner. Based on an initial patch by Ursula Braun. Fixes: 9dc48ccc ("qeth: serialize sysfs-triggered device configurations") Signed-off-by:
Alexandra Winter <wintera@linux.ibm.com> Signed-off-by:
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Julian Wiedmann authored
When qeth_dev_layer2_store() - holding the discipline_mutex - waits inside qeth_l*_remove_device() for a qeth_do_reset() thread to complete, we can hit a deadlock if qeth_do_reset() concurrently calls qeth_set_online() and thus tries to aquire the discipline_mutex. Move the discipline_mutex locking outside of qeth_set_online() and qeth_set_offline(), and turn the discipline into a parameter so that callers understand the dependency. To fix the deadlock, we can now relax the locking: As already established, qeth_l*_remove_device() waits for qeth_do_reset() to complete. So qeth_do_reset() itself is under no risk of having card->discipline ripped out while it's running, and thus doesn't need to take the discipline_mutex. Fixes: 9dc48ccc ("qeth: serialize sysfs-triggered device configurations") Signed-off-by:
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Jakub Kicinski authored
Ido Schimmel says: ==================== nexthop: Various fixes This series contains various fixes for the nexthop code. The bugs were uncovered during the development of resilient nexthop groups. Patches #1-#2 fix the error path of nexthop_create_group(). I was not able to trigger these bugs with current code, but it is possible with the upcoming resilient nexthop groups code which adds a user controllable memory allocation further in the function. Patch #3 fixes wrong validation of netlink attributes. Patch #4 fixes wrong invocation of mausezahn in a selftest. ==================== Link: https://lore.kernel.org/r/20210107144824.1135691-1-idosch@idosch.orgSigned-off-by:
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Ido Schimmel authored
For IPv6 traffic, mausezahn needs to be invoked with '-6'. Otherwise an error is returned: # ip netns exec me mausezahn veth1 -B 2001:db8:101::2 -A 2001:db8:91::1 -c 0 -t tcp "dp=1-1023, flags=syn" Failed to set source IPv4 address. Please check if source is set to a valid IPv4 address. Invalid command line parameters! Fixes: 7c741868 ("selftests: Add torture tests to nexthop tests") Signed-off-by:
Ido Schimmel <idosch@nvidia.com> Reviewed-by:
Petr Machata <petrm@nvidia.com> Reviewed-by:
David Ahern <dsahern@kernel.org> Signed-off-by:
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Petr Machata authored
The function nh_check_attr_group() is called to validate nexthop groups. The intention of that code seems to have been to bounce all attributes above NHA_GROUP_TYPE except for NHA_FDB. However instead it bounces all these attributes except when NHA_FDB attribute is present--then it accepts them. NHA_FDB validation that takes place before, in rtm_to_nh_config(), already bounces NHA_OIF, NHA_BLACKHOLE, NHA_ENCAP and NHA_ENCAP_TYPE. Yet further back, NHA_GROUPS and NHA_MASTER are bounced unconditionally. But that still leaves NHA_GATEWAY as an attribute that would be accepted in FDB nexthop groups (with no meaning), so long as it keeps the address family as unspecified: # ip nexthop add id 1 fdb via 127.0.0.1 # ip nexthop add id 10 fdb via default group 1 The nexthop code is still relatively new and likely not used very broadly, and the FDB bits are newer still. Even though there is a reproducer out there, it relies on an improbable gateway arguments "via default", "via all" or "via any". Given all this, I believe it is OK to reformulate the condition to do the right thing and bounce NHA_GATEWAY. Fixes: 38428d68 ("nexthop: support for fdb ecmp nexthops") Signed-off-by:
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Ido Schimmel authored
In case of error, remove the nexthop group entry from the list to which it was previously added. Fixes: 430a0491 ("nexthop: Add support for nexthop groups") Signed-off-by:
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Ido Schimmel authored
A reference was not taken for the current nexthop entry, so do not try to put it in the error path. Fixes: 430a0491 ("nexthop: Add support for nexthop groups") Signed-off-by:
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Colin Ian King authored
Currently the error return paths don't kfree lmac and lmac->name leading to some memory leaks. Fix this by adding two error return paths that kfree these objects Addresses-Coverity: ("Resource leak") Fixes: 1463f382 ("octeontx2-af: Add support for CGX link management") Signed-off-by:Colin Ian King <colin.king@canonical.com> Link: https://lore.kernel.org/r/20210107123916.189748-1-colin.king@canonical.comSigned-off-by:
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Jakub Kicinski authored
Ayush Sawal says: ==================== Bug fixes for chtls driver patch 1: Fix hardware tid leak. patch 2: Remove invalid set_tcb call. patch 3: Fix panic when route to peer not configured. patch 4: Avoid unnecessary freeing of oreq pointer. patch 5: Replace skb_dequeue with skb_peek. patch 6: Added a check to avoid NULL pointer dereference patch. patch 7: Fix chtls resources release sequence. ==================== Link: https://lore.kernel.org/r/20210106042912.23512-1-ayush.sawal@chelsio.comSigned-off-by:
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Ayush Sawal authored
CPL_ABORT_RPL is sent after releasing the resources by calling chtls_release_resources(sk); and chtls_conn_done(sk); eventually causing kernel panic. Fixing it by calling release in appropriate order. Fixes: cc35c88a ("crypto : chtls - CPL handler definition") Signed-off-by:
Vinay Kumar Yadav <vinay.yadav@chelsio.com> Signed-off-by:
Ayush Sawal <ayush.sawal@chelsio.com> Signed-off-by:
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Ayush Sawal authored
In case of server removal lookup_stid() may return NULL pointer, which is used as listen_ctx. So added a check before accessing this pointer. Fixes: cc35c88a ("crypto : chtls - CPL handler definition") Signed-off-by:
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Ayush Sawal authored
The skb is unlinked twice, one in __skb_dequeue in function chtls_reset_synq() and another in cleanup_syn_rcv_conn(). So in this patch using skb_peek() instead of __skb_dequeue(), so that unlink will be handled only in cleanup_syn_rcv_conn(). Fixes: cc35c88a ("crypto : chtls - CPL handler definition") Signed-off-by:
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