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@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/media/i2c/tc358743.c b/drivers/media/i2c/tc358743.c
index d9bc3851bf63b9c161b80eee875cad87a9b2adb9..041b16965b9674b847eeefd9ba734468fdaa4708 100644 (file)
--- a/drivers/media/i2c/tc358743.c
+++ b/drivers/media/i2c/tc358743.c
@@ -2192,7 +2192,7 @@ 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);