diff mbox series

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

Message ID 20210406134812.2148278-1-yangyingliang@huawei.com (mailing list archive)
State Accepted, archived
Delegated to: Hans Verkuil
Headers
Series [-next] media: i2c: adv7511-v4l2: fix possible use-after-free in adv7511_remove() |

Commit Message

Yang Yingliang April 6, 2021, 1:48 p.m. UTC 
  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>
---
 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 9183003ae22d..b4f0fdf8fc06 100644
--- a/drivers/media/i2c/adv7511-v4l2.c
+++ b/drivers/media/i2c/adv7511-v4l2.c
@@ -1958,7 +1958,7 @@  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);