media: i2c: adv7511-v4l2: fix possible use-after-free in adv7511_remove()

[ Upstream commit 2c9541720c66899adf6f3600984cf3ef151295ad ]

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/adv7511-v4l2.c b/drivers/media/i2c/adv7511-v4l2.c
index 62763ec4cd073a567b3893d0090fdfbf67dc2281..809fa44ed988013356245072f1a9b890c48a4d2b 100644 (file)
--- a/drivers/media/i2c/adv7511-v4l2.c
+++ b/drivers/media/i2c/adv7511-v4l2.c
@@ -1964,7 +1964,7 @@ static int adv7511_remove(struct i2c_client *client)
 
        adv7511_set_isr(sd, false);
        adv7511_init_setup(sd);
-       cancel_delayed_work(&state->edid_handler);
+       cancel_delayed_work_sync(&state->edid_handler);
        i2c_unregister_device(state->i2c_edid);
        i2c_unregister_device(state->i2c_cec);
        i2c_unregister_device(state->i2c_pktmem);