diff mbox series

[4.4,032/190] media: i2c: adv7511-v4l2: fix possible use-after-free in adv7511_remove()

Message ID 20210520092103.235976740@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH May 20, 2021, 9:21 a.m. UTC 
From: Yang Yingliang <yangyingliang@huawei.com>

[ 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>
---
 drivers/media/i2c/adv7511-v4l2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/media/i2c/adv7511-v4l2.c b/drivers/media/i2c/adv7511-v4l2.c
index b35400e4e9af..e85777dfe81d 100644
--- a/drivers/media/i2c/adv7511-v4l2.c
+++ b/drivers/media/i2c/adv7511-v4l2.c
@@ -1570,7 +1570,7 @@  static int adv7511_remove(struct i2c_client *client)
 		 client->addr << 1, client->adapter->name);
 
 	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_pktmem);
 	destroy_workqueue(state->work_queue);