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[media] videodev: fix a NULL pointer dereference in v4l2_device_release()

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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 <ospite@studenti.unina.it>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Antonio Ospite 2011-10-12 17:59:26 -03:00 committed by Mauro Carvalho Chehab
parent 899e3ee404
commit e58fced201
1 changed files with 1 additions and 1 deletions
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2
drivers/media/video/v4l2-dev.c
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@ -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