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[media] videodev: fix a NULL pointer dereference in v4l2_device_relea…


The change in 8280b66 does not cover the case when v4l2_dev is already
NULL, fix that.

With a Kinect sensor, seen as an USB camera using GSPCA in this context,
a NULL pointer dereference BUG can be triggered by just unplugging the
device after the camera driver has been loaded.

Signed-off-by: Antonio Ospite <>
Signed-off-by: Mauro Carvalho Chehab <>
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1 parent 899e3ee commit e58fced201ad6e6cb673f07499919c3b20792d94 @ao2 ao2 committed with Mauro Carvalho Chehab Oct 12, 2011
Showing with 1 addition and 1 deletion.
  1. +1 −1 drivers/media/video/v4l2-dev.c
2 drivers/media/video/v4l2-dev.c
@@ -181,7 +181,7 @@ static void v4l2_device_release(struct device *cd)
* TODO: In the long run all drivers that use v4l2_device should use the
* v4l2_device release callback. This check will then be unnecessary.
- if (v4l2_dev->release == NULL)
+ if (v4l2_dev && v4l2_dev->release == NULL)
v4l2_dev = NULL;
/* Release video_device and perform other

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