FAILED: patch "[PATCH] media: cec: disable delayed work before freeing an" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 0fbd5c2327020858c45b2d1c65775d64cdeca523
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026090931-relocate-ranked-438d@gregkh' --subject-prefix 'PATCH 5.15.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 0fbd5c2327020858c45b2d1c65775d64cdeca523 Mon Sep 17 00:00:00 2001
From: Biren Pandya <birenpandya@gmail.com>
Date: Sun, 21 Jun 2026 10:04:37 +0530
Subject: [PATCH] media: cec: disable delayed work before freeing an
 interrupted transmit

cec_transmit_msg_fh() drops adap->lock to wait for a blocking transmit in
wait_for_completion_killable(). If that wait is interrupted by a signal,
cancel_delayed_work_sync() can run before the CEC kthread arms the reply
timeout via schedule_delayed_work(&data->work) in cec_transmit_done_ts().
The work is then armed after the cancel, and the data is freed with its
delayed_work still pending:

  ODEBUG: free active (active state 0) object: ... hint: cec_wait_timeout

Use disable_delayed_work_sync(): it cancels the work and disables it, so
the later schedule_delayed_work() becomes a no-op and the work cannot be
re-armed. The data is freed right after, so it need not be re-enabled.

Fixes: 490d84f6d73c ("media: cec: forgot to cancel delayed work")
Reported-by: syzbot+051024d603432b4ab395@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=051024d603432b4ab395
Suggested-by: Hillf Danton <hdanton@sina.com>
Cc: stable@vger.kernel.org
Signed-off-by: Biren Pandya <birenpandya@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

diff --git a/drivers/media/cec/core/cec-adap.c b/drivers/media/cec/core/cec-adap.c
index a90cb84a4b4d..829ee4861bf7 100644
--- a/drivers/media/cec/core/cec-adap.c
+++ b/drivers/media/cec/core/cec-adap.c
@@ -965,7 +965,7 @@ int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
 	 */
 	mutex_unlock(&adap->lock);
 	err = wait_for_completion_killable(&data->c);
-	cancel_delayed_work_sync(&data->work);
+	disable_delayed_work_sync(&data->work);
 	mutex_lock(&adap->lock);
 
 	if (err)