This is a note to let you know that I've just added the patch titled
media: adv7604: fix possible use-after-free in adv76xx_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-adv7604-fix-possible-use-after-free-in-adv76xx.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 b00f6fca9ebcf3e959d9be29ed8620009af6d920
Author: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Date: Tue Apr 6 15:42:46 2021 +0200
media: adv7604: fix possible use-after-free in adv76xx_remove()
[ Upstream commit fa56f5f1fe31c2050675fa63b84963ebd504a5b3 ]
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/adv7604.c b/drivers/media/i2c/adv7604.c
index 09004d928d11..d1f58795794f 100644
--- a/drivers/media/i2c/adv7604.c
+++ b/drivers/media/i2c/adv7604.c
@@ -3616,7 +3616,7 @@ static int adv76xx_remove(struct i2c_client *client)
io_write(sd, 0x6e, 0);
io_write(sd, 0x73, 0);
- cancel_delayed_work(&state->delayed_work_enable_hotplug);
+ cancel_delayed_work_sync(&state->delayed_work_enable_hotplug);
v4l2_async_unregister_subdev(sd);
media_entity_cleanup(&sd->entity);
adv76xx_unregister_clients(to_state(sd));
