From: Biren Pandya <birenpandya@gmail.com> mainline inclusion from mainline-v7.3-rc1 commit 0fbd5c2327020858c45b2d1c65775d64cdeca523 category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/19090 CVE: CVE-2026-89899 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- 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> Conflicts: drivers/media/cec/core/cec-adap.c [context conflict, not merge patch cbe499977bc3("media: cec: core: avoid confusing "transmit timed out" message")] Signed-off-by: Chen jinghuang <chenjinghuang2@huawei.com> --- drivers/media/cec/core/cec-adap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/cec/core/cec-adap.c b/drivers/media/cec/core/cec-adap.c index 513e8739bfcb..258bafee8d11 100644 --- a/drivers/media/cec/core/cec-adap.c +++ b/drivers/media/cec/core/cec-adap.c @@ -913,7 +913,7 @@ int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg, */ mutex_unlock(&adap->lock); wait_for_completion_killable(&data->c); - cancel_delayed_work_sync(&data->work); + disable_delayed_work_sync(&data->work); mutex_lock(&adap->lock); /* Cancel the transmit if it was interrupted */ -- 2.34.1