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Sven Stegemann c0bffbc92a net: kcm: Fix race condition in kcm_unattach() 
[ Upstream commit 52565a9352 ]

syzbot found a race condition when kcm_unattach(psock)
and kcm_release(kcm) are executed at the same time.

kcm_unattach() is missing a check of the flag
kcm->tx_stopped before calling queue_work().

If the kcm has a reserved psock, kcm_unattach() might get executed
between cancel_work_sync() and unreserve_psock() in kcm_release(),
requeuing kcm->tx_work right before kcm gets freed in kcm_done().

Remove kcm->tx_stopped and replace it by the less
error-prone disable_work_sync().

Fixes: ab7ac4eb98 ("kcm: Kernel Connection Multiplexor module")
Reported-by: syzbot+e62c9db591c30e174662@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=e62c9db591c30e174662
Reported-by: syzbot+d199b52665b6c3069b94@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=d199b52665b6c3069b94
Reported-by: syzbot+be6b1fdfeae512726b4e@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=be6b1fdfeae512726b4e
Signed-off-by: Sven Stegemann <sven@stegemann.de>
Link: https://patch.msgid.link/20250812191810.27777-1-sven@stegemann.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-08-20 18:30:18 +02:00
..
acpi ACPICA: Avoid sequence overread in call to strncmp() 2025-06-27 11:11:26 +01:00
asm-generic mm: hugetlb: Add huge page size param to huge_ptep_get_and_clear() 2025-03-13 13:02:17 +01:00
clocksource x86/hyperv: Fix hv tsc page based sched_clock for hibernation 2024-12-27 14:02:15 +01:00
crypto crypto: ahash - Set default reqsize from ahash_alg 2025-05-29 11:02:40 +02:00
cxl cxl: Move mailbox related bits to the same context 2024-09-12 08:38:01 -07:00
drm drm/amdgpu: Reset the clear flag in buddy during resume 2025-08-01 09:48:42 +01:00
dt-bindings dt-bindings: clock: sunxi: Export PLL_VIDEO_2X and PLL_MIPI 2025-02-08 09:57:09 +01:00
keys KEYS: Remove unused declarations 2024-09-20 18:28:26 +03:00
kunit kunit: platform: Resolve 'struct completion' warning 2025-02-21 14:01:25 +01:00
kvm KVM: arm64: Refine PMU defines for number of counters 2024-08-16 13:09:12 +01:00
linux mm/memory-tier: fix abstract distance calculation overflow 2025-08-20 18:30:16 +02:00
math-emu powerpc/math-emu: Remove -w build flag and fix warnings 2022-09-05 17:28:25 +10:00
media media: v4l: Memset argument to 0 before calling get_mbus_config pad op 2025-05-29 11:02:49 +02:00
memory memory: renesas-rpc-if: Remove Runtime PM wrappers 2023-01-23 11:48:00 +01:00
misc cxl: fix typo in comment 2022-11-24 23:12:19 +11:00
net net: kcm: Fix race condition in kcm_unattach() 2025-08-20 18:30:18 +02:00
pcmcia ARM: pxa/sa1100: move I/O space to PCI_IOBASE 2022-05-07 22:56:17 +02:00
ras mm/memory-failure: remove obsolete MF_MSG_DIFFERENT_COMPOUND 2024-07-12 15:52:22 -07:00
rdma RDMA/uverbs: Propagate errors from rdma_lookup_get_uobject() 2025-05-29 11:02:19 +02:00
rv rv: Reset per-task monitors also for idle tasks 2025-02-17 10:05:30 +01:00
scsi move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
soc soc: qcom: ice: introduce devm_of_qcom_ice_get 2025-05-02 07:58:52 +02:00
sound ASoC: tas2781: Fix the wrong step for TLV on tas2781 2025-08-15 12:14:06 +02:00
target move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
trace rxrpc: Fix recv-recv race of completed call 2025-07-24 08:56:35 +02:00
uapi io_uring: don't use int for ABI 2025-08-20 18:30:11 +02:00
ufs scsi: ufs: Introduce quirk to extend PA_HIBERN8TIME for UFS devices 2025-05-29 11:01:58 +02:00
vdso random: vDSO: add a __vdso_getrandom prototype for all architectures 2024-09-13 17:28:35 +02:00
video fbdev: da8xx: remove the driver 2024-10-15 10:08:23 +02:00
xen xen/mcelog: Add __nonstring annotations for unterminated strings 2025-04-20 10:15:12 +02:00