This is a note to let you know that I've just added the patch titled media: tc358743: fix possible use-after-free in tc358743_remove() to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: media-tc358743-fix-possible-use-after-free-in-tc3587.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit af8063f258dcc4599d9817315ef92f25fe2ac932 Author: Yang Yingliang <yangyingliang@xxxxxxxxxx> Date: Tue Apr 6 15:39:29 2021 +0200 media: tc358743: fix possible use-after-free in tc358743_remove() [ Upstream commit 6107a4fdf8554a7aa9488bdc835bb010062fa8a9 ] This driver's remove path calls cancel_delayed_work(). However, that function does not wait until the work function finishes. This means that the callback function may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling cancel_delayed_work_sync(), which ensures that the work is properly cancelled, no longer running, and unable to re-schedule itself. Reported-by: Hulk Robot <hulkci@xxxxxxxxxx> Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx> Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/media/i2c/tc358743.c b/drivers/media/i2c/tc358743.c index 831b5b54fd78..1b309bb743c7 100644 --- a/drivers/media/i2c/tc358743.c +++ b/drivers/media/i2c/tc358743.c @@ -2193,7 +2193,7 @@ static int tc358743_remove(struct i2c_client *client) del_timer_sync(&state->timer); flush_work(&state->work_i2c_poll); } - cancel_delayed_work(&state->delayed_work_enable_hotplug); + cancel_delayed_work_sync(&state->delayed_work_enable_hotplug); cec_unregister_adapter(state->cec_adap); v4l2_async_unregister_subdev(sd); v4l2_device_unregister_subdev(sd);