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Jiri Pirko aa1eec2f54 net/mlx5: DPLL, Fix possible use after free after delayed work timer triggers 
I managed to hit following use after free warning recently:

[ 2169.711665] ==================================================================
[ 2169.714009] BUG: KASAN: slab-use-after-free in __run_timers.part.0+0x179/0x4c0
[ 2169.716293] Write of size 8 at addr ffff88812b326a70 by task swapper/4/0

[ 2169.719022] CPU: 4 PID: 0 Comm: swapper/4 Not tainted 6.8.0-rc2jiri+ #2
[ 2169.720974] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
[ 2169.722457] Call Trace:
[ 2169.722756]  <IRQ>
[ 2169.723024]  dump_stack_lvl+0x58/0xb0
[ 2169.723417]  print_report+0xc5/0x630
[ 2169.723807]  ? __virt_addr_valid+0x126/0x2b0
[ 2169.724268]  kasan_report+0xbe/0xf0
[ 2169.724667]  ? __run_timers.part.0+0x179/0x4c0
[ 2169.725116]  ? __run_timers.part.0+0x179/0x4c0
[ 2169.725570]  __run_timers.part.0+0x179/0x4c0
[ 2169.726003]  ? call_timer_fn+0x320/0x320
[ 2169.726404]  ? lock_downgrade+0x3a0/0x3a0
[ 2169.726820]  ? kvm_clock_get_cycles+0x14/0x20
[ 2169.727257]  ? ktime_get+0x92/0x150
[ 2169.727630]  ? lapic_next_deadline+0x35/0x60
[ 2169.728069]  run_timer_softirq+0x40/0x80
[ 2169.728475]  __do_softirq+0x1a1/0x509
[ 2169.728866]  irq_exit_rcu+0x95/0xc0
[ 2169.729241]  sysvec_apic_timer_interrupt+0x6b/0x80
[ 2169.729718]  </IRQ>
[ 2169.729993]  <TASK>
[ 2169.730259]  asm_sysvec_apic_timer_interrupt+0x16/0x20
[ 2169.730755] RIP: 0010:default_idle+0x13/0x20
[ 2169.731190] Code: c0 08 00 00 00 4d 29 c8 4c 01 c7 4c 29 c2 e9 72 ff ff ff cc cc cc cc 8b 05 9a 7f 1f 02 85 c0 7e 07 0f 00 2d cf 69 43 00 fb f4 <fa> c3 66 66 2e 0f 1f 84 00 00 00 00 00 65 48 8b 04 25 c0 93 04 00
[ 2169.732759] RSP: 0018:ffff888100dbfe10 EFLAGS: 00000242
[ 2169.733264] RAX: 0000000000000001 RBX: ffff888100d9c200 RCX: ffffffff8241bd62
[ 2169.733925] RDX: ffffed109a848b15 RSI: 0000000000000004 RDI: ffffffff8127ac55
[ 2169.734566] RBP: 0000000000000004 R08: 0000000000000000 R09: ffffed109a848b14
[ 2169.735200] R10: ffff8884d42458a3 R11: 000000000000ba7e R12: ffffffff83d7d3a0
[ 2169.735835] R13: 1ffff110201b7fc6 R14: 0000000000000000 R15: ffff888100d9c200
[ 2169.736478]  ? ct_kernel_exit.constprop.0+0xa2/0xc0
[ 2169.736954]  ? do_idle+0x285/0x290
[ 2169.737323]  default_idle_call+0x63/0x90
[ 2169.737730]  do_idle+0x285/0x290
[ 2169.738089]  ? arch_cpu_idle_exit+0x30/0x30
[ 2169.738511]  ? mark_held_locks+0x1a/0x80
[ 2169.738917]  ? lockdep_hardirqs_on_prepare+0x12e/0x200
[ 2169.739417]  cpu_startup_entry+0x30/0x40
[ 2169.739825]  start_secondary+0x19a/0x1c0
[ 2169.740229]  ? set_cpu_sibling_map+0xbd0/0xbd0
[ 2169.740673]  secondary_startup_64_no_verify+0x15d/0x16b
[ 2169.741179]  </TASK>

[ 2169.741686] Allocated by task 1098:
[ 2169.742058]  kasan_save_stack+0x1c/0x40
[ 2169.742456]  kasan_save_track+0x10/0x30
[ 2169.742852]  __kasan_kmalloc+0x83/0x90
[ 2169.743246]  mlx5_dpll_probe+0xf5/0x3c0 [mlx5_dpll]
[ 2169.743730]  auxiliary_bus_probe+0x62/0xb0
[ 2169.744148]  really_probe+0x127/0x590
[ 2169.744534]  __driver_probe_device+0xd2/0x200
[ 2169.744973]  device_driver_attach+0x6b/0xf0
[ 2169.745402]  bind_store+0x90/0xe0
[ 2169.745761]  kernfs_fop_write_iter+0x1df/0x2a0
[ 2169.746210]  vfs_write+0x41f/0x790
[ 2169.746579]  ksys_write+0xc7/0x160
[ 2169.746947]  do_syscall_64+0x6f/0x140
[ 2169.747333]  entry_SYSCALL_64_after_hwframe+0x46/0x4e

[ 2169.748049] Freed by task 1220:
[ 2169.748393]  kasan_save_stack+0x1c/0x40
[ 2169.748789]  kasan_save_track+0x10/0x30
[ 2169.749188]  kasan_save_free_info+0x3b/0x50
[ 2169.749621]  poison_slab_object+0x106/0x180
[ 2169.750044]  __kasan_slab_free+0x14/0x50
[ 2169.750451]  kfree+0x118/0x330
[ 2169.750792]  mlx5_dpll_remove+0xf5/0x110 [mlx5_dpll]
[ 2169.751271]  auxiliary_bus_remove+0x2e/0x40
[ 2169.751694]  device_release_driver_internal+0x24b/0x2e0
[ 2169.752191]  unbind_store+0xa6/0xb0
[ 2169.752563]  kernfs_fop_write_iter+0x1df/0x2a0
[ 2169.753004]  vfs_write+0x41f/0x790
[ 2169.753381]  ksys_write+0xc7/0x160
[ 2169.753750]  do_syscall_64+0x6f/0x140
[ 2169.754132]  entry_SYSCALL_64_after_hwframe+0x46/0x4e

[ 2169.754847] Last potentially related work creation:
[ 2169.755315]  kasan_save_stack+0x1c/0x40
[ 2169.755709]  __kasan_record_aux_stack+0x9b/0xf0
[ 2169.756165]  __queue_work+0x382/0x8f0
[ 2169.756552]  call_timer_fn+0x126/0x320
[ 2169.756941]  __run_timers.part.0+0x2ea/0x4c0
[ 2169.757376]  run_timer_softirq+0x40/0x80
[ 2169.757782]  __do_softirq+0x1a1/0x509

[ 2169.758387] Second to last potentially related work creation:
[ 2169.758924]  kasan_save_stack+0x1c/0x40
[ 2169.759322]  __kasan_record_aux_stack+0x9b/0xf0
[ 2169.759773]  __queue_work+0x382/0x8f0
[ 2169.760156]  call_timer_fn+0x126/0x320
[ 2169.760550]  __run_timers.part.0+0x2ea/0x4c0
[ 2169.760978]  run_timer_softirq+0x40/0x80
[ 2169.761381]  __do_softirq+0x1a1/0x509

[ 2169.761998] The buggy address belongs to the object at ffff88812b326a00
                which belongs to the cache kmalloc-256 of size 256
[ 2169.763061] The buggy address is located 112 bytes inside of
                freed 256-byte region [ffff88812b326a00, ffff88812b326b00)

[ 2169.764346] The buggy address belongs to the physical page:
[ 2169.764866] page:000000000f2b1e89 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12b324
[ 2169.765731] head:000000000f2b1e89 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 2169.766484] anon flags: 0x200000000000840(slab|head|node=0|zone=2)
[ 2169.767048] page_type: 0xffffffff()
[ 2169.767422] raw: 0200000000000840 ffff888100042b40 0000000000000000 dead000000000001
[ 2169.768183] raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000
[ 2169.768899] page dumped because: kasan: bad access detected

[ 2169.769649] Memory state around the buggy address:
[ 2169.770116]  ffff88812b326900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 2169.770805]  ffff88812b326980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 2169.771485] >ffff88812b326a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 2169.772173]                                                              ^
[ 2169.772787]  ffff88812b326a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 2169.773477]  ffff88812b326b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 2169.774160] ==================================================================
[ 2169.774845] ==================================================================

I didn't manage to reproduce it. Though the issue seems to be obvious.
There is a chance that the mlx5_dpll_remove() calls
cancel_delayed_work() when the work runs and manages to re-arm itself.
In that case, after delay timer triggers next attempt to queue it,
it works with freed memory.

Fix this by using cancel_delayed_work_sync() instead which makes sure
that work is done when it returns.

Fixes: 496fd0a26b ("mlx5: Implement SyncE support using DPLL infrastructure")
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240206164328.360313-1-jiri@resnulli.us
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-02-08 18:32:23 -08:00
arch percpu: 2024-02-08 06:08:37 +00:00
block block: Fix where bio IO priority gets set 2024-02-01 11:00:06 -07:00
certs This update includes the following changes: 2023-11-02 16:15:30 -10:00
crypto crypto: algif_hash - Remove bogus SGL free on zero-length error path 2024-02-02 18:08:12 +08:00
Documentation dpll: fix possible deadlock during netlink dump operation 2024-02-08 18:29:21 -08:00
drivers net/mlx5: DPLL, Fix possible use after free after delayed work timer triggers 2024-02-08 18:32:23 -08:00
fs nfsd-6.8 fixes: 2024-02-07 17:48:15 +00:00
include Including fixes from WiFi and netfilter. 2024-02-08 15:09:29 -08:00
init Kconfig: Disable -Wstringop-overflow for GCC globally 2024-02-01 14:57:17 -08:00
io_uring io_uring/net: fix sr->len for IORING_OP_RECV with MSG_WAITALL and buffers 2024-02-01 06:42:36 -07:00
ipc shm: Slim down dependencies 2023-12-20 19:26:31 -05:00
kernel Tracing and eventfs fixes for v6.8: 2024-02-02 15:32:58 -08:00
lib linux_kselftest-kunit-fixes-6.8-rc3 2024-01-30 15:12:58 -08:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm 22 hotfixes. 11 are cc:stable and the remainder address post-6.7 issues 2024-01-29 17:12:16 -08:00
net netfilter pull request 24-02-08 2024-02-08 12:56:40 +01:00
rust Rust changes for v6.8 2024-01-11 13:05:41 -08:00
samples samples/cgroup: add .gitignore file for generated samples 2024-01-24 11:52:40 -08:00
scripts Kbuild fixes for v6.8 2024-02-01 11:57:42 -08:00
security lsm/stable-6.8 PR 20240131 2024-02-01 10:00:28 -08:00
sound ASoC: Fixes for v6.8 2024-02-01 19:40:42 +01:00
tools Including fixes from WiFi and netfilter. 2024-02-08 15:09:29 -08:00
usr Kbuild updates for v6.8 2024-01-18 17:57:07 -08:00
virt Generic: 2024-01-17 13:03:37 -08:00
.clang-format clang-format: Update with v6.7-rc4's for_each macro list 2023-12-08 23:54:38 +01:00
.cocciconfig
.editorconfig Add .editorconfig file for basic formatting 2023-12-28 16:22:47 +09:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Add .editorconfig file for basic formatting 2023-12-28 16:22:47 +09:00
.mailmap Char/Misc and other Driver changes for 6.8-rc1 2024-01-17 16:47:17 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: supplement of zswap maintainers update 2024-01-25 23:52:21 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Including fixes from WiFi and netfilter. 2024-02-08 15:09:29 -08:00
Makefile Linux 6.8-rc3 2024-02-04 12:20:36 +00:00
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