Files
linux/include/net
Sven Stegemann 52565a9352 net: kcm: Fix race condition in kcm_unattach()
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>
2025-08-13 18:18:33 -07:00
..
2024-10-08 15:33:49 -07:00
2024-12-09 14:44:59 -08:00
2025-07-15 12:08:39 +02:00
2025-01-20 12:16:04 -08:00
2025-04-24 17:03:45 -07:00
2025-07-08 18:05:25 -07:00
2025-07-07 16:55:54 -07:00
2025-03-24 10:26:53 +00:00
2022-08-09 22:14:02 -07:00
2024-05-08 10:35:09 +01:00
2024-08-26 09:37:23 -07:00
2024-11-13 18:49:50 -08:00
2024-08-26 09:37:23 -07:00
2024-05-07 01:35:55 +02:00
2024-08-26 09:37:23 -07:00
2021-10-15 11:33:08 +01:00
2024-02-28 11:19:41 +00:00
2025-07-02 14:32:30 -07:00
2024-12-06 17:43:08 -08:00
2021-10-13 09:40:46 -07:00
2024-08-26 09:37:23 -07:00
2025-04-15 08:21:46 -07:00
2023-07-14 20:39:30 -07:00
2024-08-26 09:37:23 -07:00
2024-08-26 09:37:23 -07:00
2025-06-27 15:34:19 -07:00
2025-04-11 18:58:10 -07:00
2025-07-04 09:32:35 +02:00
2025-04-11 18:58:10 -07:00
2024-05-30 18:29:38 -07:00
2024-05-30 18:29:38 -07:00
2023-10-04 11:49:20 -07:00
2025-07-11 11:00:57 -07:00
2024-05-09 20:25:55 -07:00
2023-07-28 14:07:59 -07:00
2022-12-12 15:04:39 -08:00
2023-09-14 16:16:36 +02:00