Fixes sporadic IPv6 packet loss when flow offloading is enabled.

IPv6 route GC and flowtable GC are not synchronized.
When dst_cache becomes stale and a packet passes through the flow before
the flowtable GC teardowns it, the packet can be dropped.
So, it is necessary to check dst every time in packet path.

Fixes: 227e1e4d ("netfilter: nf_flowtable: skip device lookup from interface index")
Signed-off-by: Ritaro Takenaka <ritarot634@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

This patch addresses three possible problems:

1. ct gc may race to undo the timeout adjustment of the packet path, leaving
   the conntrack entry in place with the internal offload timeout (one day).

2. ct gc removes the ct because the IPS_OFFLOAD_BIT is not set and the CLOSE
   timeout is reached before the flow offload del.

3. tcp ct is always set to ESTABLISHED with a very long timeout
   in flow offload teardown/delete even though the state might be already
   CLOSED. Also as a remark we cannot assume that the FIN or RST packet
   is hitting flow table teardown as the packet might get bumped to the
   slow path in nftables.

This patch resets IPS_OFFLOAD_BIT from flow_offload_teardown(), so
conntrack handles the tcp rst/fin packet which triggers the CLOSE/FIN
state transition.

Moreover, teturn the connection's ownership to conntrack upon teardown
by clearing the offload flag and fixing the established timeout value.
The flow table GC thread will asynchonrnously free the flow table and
hardware offload entries.

Before this patch, the IPS_OFFLOAD_BIT remained set for expired flows on
which is also misleading since the flow is back to classic conntrack
path.

If nf_ct_delete() removes the entry from the conntrack table, then it
calls nf_ct_put() which decrements the refcnt. This is not a problem
because the flowtable holds a reference to the conntrack object from
flow_offload_alloc() path which is released via flow_offload_free().

This patch also updates nft_flow_offload to skip packets in SYN_RECV
state. Since we might miss or bump packets to slow path, we do not know
what will happen there while we are still in SYN_RECV, this patch
postpones offload up to the next packet which also aligns to the
existing behaviour in tc-ct.

flow_offload_teardown() does not reset the existing tcp state from
flow_offload_fixup_tcp() to ESTABLISHED anymore, packets bump to slow
path might have already update the state to CLOSE/FIN.

Joint work with Oz and Sven.

Fixes: 1e5b2471 ("netfilter: nf_flow_table: teardown flow timeout race")
Signed-off-by: Oz Shlomo <ozsh@nvidia.com>
Signed-off-by: Sven Auhagen <sven.auhagen@voleatech.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

When running a combination of PPPoE on top of a VLAN, we need to set
info->outdev to the PPPoE device, otherwise PPPoE encap is skipped
during software offload.

Fixes: 72efd585 ("netfilter: flowtable: add pppoe support")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

When calling dev_fill_forward_path on a pppoe device, the provided destination
address is invalid. In order for the bridge fdb lookup to succeed, the pppoe
code needs to update ctx->daddr to the correct value.
Fix this by storing the address inside struct net_device_path_ctx

Fixes: f6efc675 ("net: ppp: resolve forwarding path for bridge pppoe devices")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

The dst entry does not contain a valid hardware address, so skip the lookup
in order to avoid running into errors here.
The proper hardware address is filled in from nft_dev_path_info

Fixes: 72efd585 ("netfilter: flowtable: add pppoe support")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

If a flow cannot be offloaded, the code currently repeatedly tries again as
quickly as possible, which can significantly increase system load.
Fix this by limiting flow timeout update and hardware offload retry to once
per second.

Fixes: c07531c0 ("netfilter: flowtable: Remove redundant hw refresh bit")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Pull networking fixes from Jakub Kicinski:
 "Including fixes from wireless, and bluetooth.

  No outstanding fires.

  Current release - regressions:

   - eth: atlantic: always deep reset on pm op, fix null-deref

  Current release - new code bugs:

   - rds: use maybe_get_net() when acquiring refcount on TCP sockets
     [refinement of a previous fix]

   - eth: ocelot: mark traps with a bool instead of guessing type based
     on list membership

  Previous releases - regressions:

   - net: fix skipping features in for_each_netdev_feature()

   - phy: micrel: fix null-derefs on suspend/resume and probe

   - bcmgenet: check for Wake-on-LAN interrupt probe deferral

  Previous releases - always broken:

   - ipv4: drop dst in multicast routing path, prevent leaks

   - ping: fix address binding wrt vrf

   - net: fix wrong network header length when BPF protocol translation
     is used on skbs with a fraglist

   - bluetooth: fix the creation of hdev->name

   - rfkill: uapi: fix RFKILL_IOCTL_MAX_SIZE ioctl request definition

   - wifi: iwlwifi: iwl-dbg: use del_timer_sync() before freeing

   - wifi: ath11k: reduce the wait time of 11d scan and hw scan while
     adding an interface

   - mac80211: fix rx reordering with non explicit / psmp ack policy

   - mac80211: reset MBSSID parameters upon connection

   - nl80211: fix races in nl80211_set_tx_bitrate_mask()

   - tls: fix context leak on tls_device_down

   - sched: act_pedit: really ensure the skb is writable

   - batman-adv: don't skb_split skbuffs with frag_list

   - eth: ocelot: fix various issues with TC actions (null-deref; bad
     stats; ineffective drops; ineffective filter removal)"

* tag 'net-5.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (61 commits)
  tls: Fix context leak on tls_device_down
  net: sfc: ef10: fix memory leak in efx_ef10_mtd_probe()
  net/smc: non blocking recvmsg() return -EAGAIN when no data and signal_pending
  net: dsa: bcm_sf2: Fix Wake-on-LAN with mac_link_down()
  mlxsw: Avoid warning during ip6gre device removal
  net: bcmgenet: Check for Wake-on-LAN interrupt probe deferral
  net: ethernet: mediatek: ppe: fix wrong size passed to memset()
  Bluetooth: Fix the creation of hdev->name
  i40e: i40e_main: fix a missing check on list iterator
  net/sched: act_pedit: really ensure the skb is writable
  s390/lcs: fix variable dereferenced before check
  s390/ctcm: fix potential memory leak
  s390/ctcm: fix variable dereferenced before check
  net: atlantic: verify hw_head_ lies within TX buffer ring
  net: atlantic: add check for MAX_SKB_FRAGS
  net: atlantic: reduce scope of is_rsc_complete
  net: atlantic: fix "frag[0] not initialized"
  net: stmmac: fix missing pci_disable_device() on error in stmmac_pci_probe()
  net: phy: micrel: Fix incorrect variable type in micrel
  decnet: Use container_of() for struct dn_neigh casts
  ...

Pull cgroup fix from Tejun Heo:
 "Waiman's fix for a cgroup2 cpuset bug where it could miss nodes which
  were hot-added"

* 'for-5.18-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup/cpuset: Remove cpus_allowed/mems_allowed setup in cpuset_init_smp()

Pull fs fixes from Jan Kara:
 "Three fixes that I'd still like to get to 5.18:

   - add a missing sanity check in the fanotify FAN_RENAME feature
     (added in 5.17, let's fix it before it gets wider usage in
     userspace)

   - udf fix for recently introduced filesystem corruption issue

   - writeback fix for a race in inode list handling that can lead to
     delayed writeback and possible dirty throttling stalls"

* tag 'fixes_for_v5.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  udf: Avoid using stale lengthOfImpUse
  writeback: Avoid skipping inode writeback
  fanotify: do not allow setting dirent events in mask of non-dir

The commit cited below claims to fix a use-after-free condition after
tls_device_down. Apparently, the description wasn't fully accurate. The
context stayed alive, but ctx->netdev became NULL, and the offload was
torn down without a proper fallback, so a bug was present, but a
different kind of bug.

Due to misunderstanding of the issue, the original patch dropped the
refcount_dec_and_test line for the context to avoid the alleged
premature deallocation. That line has to be restored, because it matches
the refcount_inc_not_zero from the same function, otherwise the contexts
that survived tls_device_down are leaked.

This patch fixes the described issue by restoring refcount_dec_and_test.
After this change, there is no leak anymore, and the fallback to
software kTLS still works.

Fixes: c55dcdd4 ("net/tls: Fix use-after-free after the TLS device goes down and up")
Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://lore.kernel.org/r/20220512091830.678684-1-maximmi@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

In the NIC ->probe() callback, ->mtd_probe() callback is called.
If NIC has 2 ports, ->probe() is called twice and ->mtd_probe() too.
In the ->mtd_probe(), which is efx_ef10_mtd_probe() it allocates and
initializes mtd partiion.
But mtd partition for sfc is shared data.
So that allocated mtd partition data from last called
efx_ef10_mtd_probe() will not be used.
Therefore it must be freed.
But it doesn't free a not used mtd partition data in efx_ef10_mtd_probe().

kmemleak reports:
unreferenced object 0xffff88811ddb0000 (size 63168):
  comm "systemd-udevd", pid 265, jiffies 4294681048 (age 348.586s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffffa3767749>] kmalloc_order_trace+0x19/0x120
    [<ffffffffa3873f0e>] __kmalloc+0x20e/0x250
    [<ffffffffc041389f>] efx_ef10_mtd_probe+0x11f/0x270 [sfc]
    [<ffffffffc0484c8a>] efx_pci_probe.cold.17+0x3df/0x53d [sfc]
    [<ffffffffa414192c>] local_pci_probe+0xdc/0x170
    [<ffffffffa4145df5>] pci_device_probe+0x235/0x680
    [<ffffffffa443dd52>] really_probe+0x1c2/0x8f0
    [<ffffffffa443e72b>] __driver_probe_device+0x2ab/0x460
    [<ffffffffa443e92a>] driver_probe_device+0x4a/0x120
    [<ffffffffa443f2ae>] __driver_attach+0x16e/0x320
    [<ffffffffa4437a90>] bus_for_each_dev+0x110/0x190
    [<ffffffffa443b75e>] bus_add_driver+0x39e/0x560
    [<ffffffffa4440b1e>] driver_register+0x18e/0x310
    [<ffffffffc02e2055>] 0xffffffffc02e2055
    [<ffffffffa3001af3>] do_one_initcall+0xc3/0x450
    [<ffffffffa33ca574>] do_init_module+0x1b4/0x700
Acked-by: Martin Habets <habetsm.xilinx@gmail.com>
Fixes: 8127d661 ("sfc: Add support for Solarflare SFC9100 family")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Link: https://lore.kernel.org/r/20220512054709.12513-1-ap420073@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Non blocking sendmsg will return -EAGAIN when any signal pending
and no send space left, while non blocking recvmsg return -EINTR
when signal pending and no data received. This may makes confused.
As TCP returns -EAGAIN in the conditions described above. Align the
behavior of smc with TCP.

Fixes: 846e344e ("net/smc: add receive timeout check")
Signed-off-by: Guangguan Wang <guangguan.wang@linux.alibaba.com>
Reviewed-by: Tony Lu <tonylu@linux.alibaba.com>
Acked-by: Karsten Graul <kgraul@linux.ibm.com>
Link: https://lore.kernel.org/r/20220512030820.73848-1-guangguan.wang@linux.alibaba.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

After commit 2d1f90f9 ("net: dsa/bcm_sf2: fix incorrect usage of
state->link") the interface suspend path would call our mac_link_down()
call back which would forcibly set the link down, thus preventing
Wake-on-LAN packets from reaching our management port.

Fix this by looking at whether the port is enabled for Wake-on-LAN and
not clearing the link status in that case to let packets go through.

Fixes: 2d1f90f9 ("net: dsa/bcm_sf2: fix incorrect usage of state->link")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20220512021731.2494261-1-f.fainelli@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

IPv6 addresses which are used for tunnels are stored in a hash table
with reference counting. When a new GRE tunnel is configured, the driver
is notified and configures it in hardware.

Currently, any change in the tunnel is not applied in the driver. It
means that if the remote address is changed, the driver is not aware of
this change and the first address will be used.

This behavior results in a warning [1] in scenarios such as the
following:

 # ip link add name gre1 type ip6gre local 2000::3 remote 2000::fffe tos inherit ttl inherit
 # ip link set name gre1 type ip6gre local 2000::3 remote 2000::ffff ttl inherit
 # ip link delete gre1

The change of the address is not applied in the driver. Currently, the
driver uses the remote address which is stored in the 'parms' of the
overlay device. When the tunnel is removed, the new IPv6 address is
used, the driver tries to release it, but as it is not aware of the
change, this address is not configured and it warns about releasing non
existing IPv6 address.

Fix it by using the IPv6 address which is cached in the IPIP entry, this
address is the last one that the driver used, so even in cases such the
above, the first address will be released, without any warning.

[1]:

WARNING: CPU: 1 PID: 2197 at drivers/net/ethernet/mellanox/mlxsw/spectrum.c:2920 mlxsw_sp_ipv6_addr_put+0x146/0x220 [mlxsw_spectrum]
...
CPU: 1 PID: 2197 Comm: ip Not tainted 5.17.0-rc8-custom-95062-gc1e5ded51a9a #84
Hardware name: Mellanox Technologies Ltd. MSN4700/VMOD0010, BIOS 5.11 07/12/2021
RIP: 0010:mlxsw_sp_ipv6_addr_put+0x146/0x220 [mlxsw_spectrum]
...
Call Trace:
 <TASK>
 mlxsw_sp2_ipip_rem_addr_unset_gre6+0xf1/0x120 [mlxsw_spectrum]
 mlxsw_sp_netdevice_ipip_ol_event+0xdb/0x640 [mlxsw_spectrum]
 mlxsw_sp_netdevice_event+0xc4/0x850 [mlxsw_spectrum]
 raw_notifier_call_chain+0x3c/0x50
 call_netdevice_notifiers_info+0x2f/0x80
 unregister_netdevice_many+0x311/0x6d0
 rtnl_dellink+0x136/0x360
 rtnetlink_rcv_msg+0x12f/0x380
 netlink_rcv_skb+0x49/0xf0
 netlink_unicast+0x233/0x340
 netlink_sendmsg+0x202/0x440
 ____sys_sendmsg+0x1f3/0x220
 ___sys_sendmsg+0x70/0xb0
 __sys_sendmsg+0x54/0xa0
 do_syscall_64+0x35/0x80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Fixes: e846efe2 ("mlxsw: spectrum: Add hash table for IPv6 address mapping")
Reported-by: Maksym Yaremchuk <maksymy@nvidia.com>
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Link: https://lore.kernel.org/r/20220511115747.238602-1-idosch@nvidia.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

The interrupt controller supplying the Wake-on-LAN interrupt line maybe
modular on some platforms (irq-bcm7038-l1.c) and might be probed at a
later time than the GENET driver. We need to specifically check for
-EPROBE_DEFER and propagate that error to ensure that we eventually
fetch the interrupt descriptor.

Fixes: 9deb48b5 ("bcmgenet: add WOL IRQ check")
Fixes: 5b1f0e62 ("net: bcmgenet: Avoid touching non-existent interrupt")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Stefan Wahren <stefan.wahren@i2se.com>
Link: https://lore.kernel.org/r/20220511031752.2245566-1-f.fainelli@gmail.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

'foe_table' is a pointer, the real size of struct mtk_foe_entry
should be pass to memset().

Fixes: ba37b7ca ("net: ethernet: mtk_eth_soc: add support for initializing the PPE")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Acked-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20220511030829.3308094-1-yangyingliang@huawei.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

Luiz Augusto von Dentz says:

====================
bluetooth pull request for net:

 - Fix the creation of hdev->name when index is greater than 9999

* tag 'for-net-2022-05-11' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth:
  Bluetooth: Fix the creation of hdev->name
====================

Link: https://lore.kernel.org/r/20220512002901.823647-1-luiz.dentz@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Kalle Valo says:

====================
wireless fixes for v5.18

Second set of fixes for v5.18 and hopefully the last one. We have a
new iwlwifi maintainer, a fix to rfkill ioctl interface and important
fixes to both stack and two drivers.

* tag 'wireless-2022-05-11' of git://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless:
  rfkill: uapi: fix RFKILL_IOCTL_MAX_SIZE ioctl request definition
  nl80211: fix locking in nl80211_set_tx_bitrate_mask()
  mac80211_hwsim: call ieee80211_tx_prepare_skb under RCU protection
  mac80211_hwsim: fix RCU protected chanctx access
  mailmap: update Kalle Valo's email
  mac80211: Reset MBSSID parameters upon connection
  cfg80211: retrieve S1G operating channel number
  nl80211: validate S1G channel width
  mac80211: fix rx reordering with non explicit / psmp ack policy
  ath11k: reduce the wait time of 11d scan and hw scan while add interface
  MAINTAINERS: update iwlwifi driver maintainer
  iwlwifi: iwl-dbg: Use del_timer_sync() before freeing
====================

Link: https://lore.kernel.org/r/20220511154535.A1A12C340EE@smtp.kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Set a size limit of 8 bytes of the written buffer to "hdev->name"
including the terminating null byte, as the size of "hdev->name" is 8
bytes. If an id value which is greater than 9999 is allocated,
then the "snprintf(hdev->name, sizeof(hdev->name), "hci%d", id)"
function call would lead to a truncation of the id value in decimal
notation.

Set an explicit maximum id parameter in the id allocation function call.
The id allocation function defines the maximum allocated id value as the
maximum id parameter value minus one. Therefore, HCI_MAX_ID is defined
as 10000.
Signed-off-by: Itay Iellin <ieitayie@gmail.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

The bug is here:
	ret = i40e_add_macvlan_filter(hw, ch->seid, vdev->dev_addr, &aq_err);

The list iterator 'ch' will point to a bogus position containing
HEAD if the list is empty or no element is found. This case must
be checked before any use of the iterator, otherwise it will
lead to a invalid memory access.

To fix this bug, use a new variable 'iter' as the list iterator,
while use the origin variable 'ch' as a dedicated pointer to
point to the found element.

Cc: stable@vger.kernel.org
Fixes: 1d8d80b4 ("i40e: Add macvlan support on i40e")
Signed-off-by: Xiaomeng Tong <xiam0nd.tong@gmail.com>
Tested-by: Gurucharan <gurucharanx.g@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Link: https://lore.kernel.org/r/20220510204846.2166999-1-anthony.l.nguyen@intel.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Currently pedit tries to ensure that the accessed skb offset
is writable via skb_unclone(). The action potentially allows
touching any skb bytes, so it may end-up modifying shared data.

The above causes some sporadic MPTCP self-test failures, due to
this code:

	tc -n $ns2 filter add dev ns2eth$i egress \
		protocol ip prio 1000 \
		handle 42 fw \
		action pedit munge offset 148 u8 invert \
		pipe csum tcp \
		index 100

The above modifies a data byte outside the skb head and the skb is
a cloned one, carrying a TCP output packet.

This change addresses the issue by keeping track of a rough
over-estimate highest skb offset accessed by the action and ensuring
such offset is really writable.

Note that this may cause performance regressions in some scenarios,
but hopefully pedit is not in the critical path.

Fixes: db2c2417 ("act_pedit: access skb->data safely")
Acked-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Tested-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Link: https://lore.kernel.org/r/1fcf78e6679d0a287dd61bb0f04730ce33b3255d.1652194627.git.pabeni@redhat.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Alexandra Winter says:

====================
s390/net: Cleanup some code checker findings

clean up smatch findings in legacy code. I was not able to provoke
any real failures on my systems, but other hardware reactions,
timing conditions or compiler output, may cause failures.

There are still 2 smatch warnings left in s390/net:

drivers/s390/net/ctcm_main.c:1326 add_channel() warn: missing error code 'rc'
This one is a false positive.

drivers/s390/net/netiucv.c:1355 netiucv_check_user() warn: argument 3 to %02x specifier has type 'char'
Postponing this one, need to better understand string handling in iucv.

There are several sparse warnings left in ctcm, like:
drivers/s390/net/ctcm_fsms.c:573:9: warning: context imbalance in 'ctcm_chx_setmode' - different lock contexts for basic block
Those are mentioned in the source, no plan to rework.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

smatch complains about
drivers/s390/net/lcs.c:1741 lcs_get_control() warn: variable dereferenced before check 'card->dev' (see line 1739)

Fixes: 27eb5ac8 ("[PATCH] s390: lcs driver bug fixes and improvements [1/2]")
Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

smatch complains about
drivers/s390/net/ctcm_mpc.c:1210 ctcmpc_unpack_skb() warn: possible memory leak of 'mpcginfo'

mpc_action_discontact() did not free mpcginfo. Consolidate the freeing in
ctcmpc_unpack_skb().

Fixes: 293d984f ("ctcm: infrastructure for replaced ctc driver")
Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Found by cppcheck and smatch.
smatch complains about
drivers/s390/net/ctcm_sysfs.c:43 ctcm_buffer_write() warn: variable dereferenced before check 'priv' (see line 42)

Fixes: 3c09e264 ("ctcm: rename READ/WRITE defines to avoid redefinitions")
Reported-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Grant Grundler says:

====================
net: atlantic: more fuzzing fixes

It essentially describes four problems:
1) validate rxd_wb->next_desc_ptr before populating buff->next
2) "frag[0] not initialized" case in aq_ring_rx_clean()
3) limit iterations handling fragments in aq_ring_rx_clean()
4) validate hw_head_ in hw_atl_b0_hw_ring_tx_head_update()

(1) was fixed by Zekun Shen <bruceshenzk@gmail.com> around the same time with
"atlantic: Fix buff_ring OOB in aq_ring_rx_clean" (SHA1 5f501532).

I've added one "clean up" contribution:
    "net: atlantic: reduce scope of is_rsc_complete"

I tested the "original" patches using chromeos-v5.4 kernel branch:
    https://chromium-review.googlesource.com/q/hashtag:pcinet-atlantic-2022q1+(status:open%20OR%20status:merged)

I've forward ported those patches to 5.18-rc2 and compiled them but am
unable to test them on 5.18-rc2 kernel (logistics problems).

Credit largely goes to ChromeOS Fuzzing team members:
    Aashay Shringarpure, Yi Chou, Shervin Oloumi

V2 changes:
o drop first patch - was already fixed upstream differently
o reduce (4) "validate hw_head_" to simple bounds checking.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Bounds check hw_head index provided by NIC to verify it lies
within the TX buffer ring.
Reported-by: Aashay Shringarpure <aashay@google.com>
Reported-by: Yi Chou <yich@google.com>
Reported-by: Shervin Oloumi <enlightened@google.com>
Signed-off-by: Grant Grundler <grundler@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Enforce that the CPU can not get stuck in an infinite loop.
Reported-by: Aashay Shringarpure <aashay@google.com>
Reported-by: Yi Chou <yich@google.com>
Reported-by: Shervin Oloumi <enlightened@google.com>
Signed-off-by: Grant Grundler <grundler@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Don't defer handling the err case outside the loop. That's pointless.

And since is_rsc_complete is only used inside this loop, declare
it inside the loop to reduce it's scope.
Signed-off-by: Grant Grundler <grundler@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

In aq_ring_rx_clean(), if buff->is_eop is not set AND
buff->len < AQ_CFG_RX_HDR_SIZE, then hdr_len remains equal to
buff->len and skb_add_rx_frag(xxx, *0*, ...) is not called.

The loop following this code starts calling skb_add_rx_frag() starting
with i=1 and thus frag[0] is never initialized. Since i is initialized
to zero at the top of the primary loop, we can just reference and
post-increment i instead of hardcoding the 0 when calling
skb_add_rx_frag() the first time.
Reported-by: Aashay Shringarpure <aashay@google.com>
Reported-by: Yi Chou <yich@google.com>
Reported-by: Shervin Oloumi <enlightened@google.com>
Signed-off-by: Grant Grundler <grundler@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Switch to using pcim_enable_device() to avoid missing pci_disable_device().
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20220510031316.1780409-1-yangyingliang@huawei.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

In lanphy_read_page_reg, calling __phy_read() might return a negative
error code. Use 'int' to check the error code.

Fixes: 7c2dcfa2 ("net: phy: micrel: Add support for LAN8804 PHY")
Signed-off-by: Wan Jiabing <wanjiabing@vivo.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20220509144519.2343399-1-wanjiabing@vivo.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Pull virtio fix from Michael Tsirkin:
 "A last minute fixup of the transitional ID numbers.

  Important to get these right - if users start to depend on the wrong
  ones they are very hard to fix"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  virtio: fix virtio transitional ids

udf_write_fi() uses lengthOfImpUse of the entry it is writing to.
However this field has not yet been initialized so it either contains
completely bogus value or value from last directory entry at that place.
In either case this is wrong and can lead to filesystem corruption or
kernel crashes.
Reported-by: butt3rflyh4ck <butterflyhuangxx@gmail.com>
CC: stable@vger.kernel.org
Fixes: 979a6e28 ("udf: Get rid of 0-length arrays in struct fileIdentDesc")
Signed-off-by: Jan Kara <jack@suse.cz>

This commit fixes the transitional PCI device ID.

Fixes: d61914ea ("virtio: update virtio id table, add transitional ids")
Signed-off-by: Shunsuke Mie <mie@igel.co.jp>
Link: https://lore.kernel.org/r/20220510102723.87666-1-mie@igel.co.jpSigned-off-by: Michael S. Tsirkin <mst@redhat.com>

Clang's structure layout randomization feature gets upset when it sees
struct neighbor (which is randomized) cast to struct dn_neigh:

net/decnet/dn_route.c:1123:15: error: casting from randomized structure pointer type 'struct neighbour *' to 'struct dn_neigh *'
			gateway = ((struct dn_neigh *)neigh)->addr;
				   ^

Update all the open-coded casts to use container_of() to do the conversion
instead of depending on strict member ordering.
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/lkml/202205041247.WKBEHGS5-lkp@intel.com
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Yajun Deng <yajun.deng@linux.dev>
Cc: Zheng Yongjun <zhengyongjun3@huawei.com>
Cc: Bill Wendling <morbo@google.com>
Cc: linux-decnet-user@lists.sourceforge.net
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220508102217.2647184-1-keescook@chromium.orgSigned-off-by: Paolo Abeni <pabeni@redhat.com>

We have run into an issue that a task gets stuck in
balance_dirty_pages_ratelimited() when perform I/O stress testing.
The reason we observed is that an I_DIRTY_PAGES inode with lots
of dirty pages is in b_dirty_time list and standard background
writeback cannot writeback the inode.
After studing the relevant code, the following scenario may lead
to the issue:

task1                                   task2
-----                                   -----
fuse_flush
 write_inode_now //in b_dirty_time
  writeback_single_inode
   __writeback_single_inode
                                 fuse_write_end
                                  filemap_dirty_folio
                                   __xa_set_mark:PAGECACHE_TAG_DIRTY
    lock inode->i_lock
    if mapping tagged PAGECACHE_TAG_DIRTY
    inode->i_state |= I_DIRTY_PAGES
    unlock inode->i_lock
                                   __mark_inode_dirty:I_DIRTY_PAGES
                                      lock inode->i_lock
                                      -was dirty,inode stays in
                                      -b_dirty_time
                                      unlock inode->i_lock

   if(!(inode->i_state & I_DIRTY_All))
      -not true,so nothing done

This patch moves the dirty inode to b_dirty list when the inode
currently is not queued in b_io or b_more_io list at the end of
writeback_single_inode.
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
CC: stable@vger.kernel.org
Fixes: 0ae45f63 ("vfs: add support for a lazytime mount option")
Signed-off-by: Jing Xia <jing.xia@unisoc.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20220510023514.27399-1-jing.xia@unisoc.com

The impact of this regression is the same for resume that I saw on
thaw: the kernel hangs and nothing except SysRq rebooting can be done.

Fixes regression in commit cbe6c3a8 ("net: atlantic: invert deep
par in pm functions, preventing null derefs"), where I disabled deep
pm resets in suspend and resume, trying to make sense of the
atl_resume_common() deep parameter in the first place.

It turns out, that atlantic always has to deep reset on pm
operations. Even though I expected that and tested resume, I screwed
up by kexec-rebooting into an unpatched kernel, thus missing the
breakage.

This fixup obsoletes the deep parameter of atl_resume_common, but I
leave the cleanup for the maintainers to post to mainline.

Suspend and hibernation were successfully tested by the reporters.

Fixes: cbe6c3a8 ("net: atlantic: invert deep par in pm functions, preventing null derefs")
Link: https://lore.kernel.org/regressions/9-Ehc_xXSwdXcvZqKD5aSqsqeNj5Izco4MYEwnx5cySXVEc9-x_WC4C3kAoCqNTi-H38frroUK17iobNVnkLtW36V6VWGSQEOHXhmVMm5iQ=@protonmail.com/Reported-by: Jordan Leppert <jordanleppert@protonmail.com>
Reported-by: Holger Hoffstaette <holger@applied-asynchrony.com>
Tested-by: Jordan Leppert <jordanleppert@protonmail.com>
Tested-by: Holger Hoffstaette <holger@applied-asynchrony.com>
CC: <stable@vger.kernel.org> # 5.10+
Signed-off-by: Manuel Ullmann <labre@posteo.de>
Link: https://lore.kernel.org/r/87bkw8dfmp.fsf@posteo.deSigned-off-by: Paolo Abeni <pabeni@redhat.com>

Simon Wunderlich says:

====================
Here is a batman-adv bugfix:

 - Don't skb_split skbuffs with frag_list, by Sven Eckelmann

* tag 'batadv-net-pullrequest-20220508' of git://git.open-mesh.org/linux-merge:
  batman-adv: Don't skb_split skbuffs with frag_list
====================

Link: https://lore.kernel.org/r/20220508132110.20451-1-sw@simonwunderlich.deSigned-off-by: Jakub Kicinski <kuba@kernel.org>

There is a race between switchdev_bridge_port_offload() and the
dsa_port_switchdev_sync_attrs() call right below it.

When switchdev_bridge_port_offload() finishes, FDB entries have been
replayed by the bridge, but are scheduled for deferred execution later.

However dsa_port_switchdev_sync_attrs -> dsa_port_can_apply_vlan_filtering()
may impose restrictions on the vlan_filtering attribute and refuse
offloading.

When this happens, the delayed FDB entries will dereference dp->bridge,
which is a NULL pointer because we have stopped the process of
offloading this bridge.

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
Workqueue: dsa_ordered dsa_slave_switchdev_event_work
pc : dsa_port_bridge_host_fdb_del+0x64/0x100
lr : dsa_slave_switchdev_event_work+0x130/0x1bc
Call trace:
 dsa_port_bridge_host_fdb_del+0x64/0x100
 dsa_slave_switchdev_event_work+0x130/0x1bc
 process_one_work+0x294/0x670
 worker_thread+0x80/0x460
---[ end trace 0000000000000000 ]---
Error: dsa_core: Must first remove VLAN uppers having VIDs also present in bridge.

Fix the bug by doing what we do on the normal bridge leave path as well,
which is to wait until the deferred FDB entries complete executing, then
exit.

The placement of dsa_flush_workqueue() after switchdev_bridge_port_unoffload()
guarantees that both the FDB additions and deletions on rollback are waited for.

Fixes: d7d0d423 ("net: dsa: flush switchdev workqueue when leaving the bridge")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20220507134550.1849834-1-vladimir.oltean@nxp.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>