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authorHans Verkuil <hverkuil@xs4all.nl>2010-12-31 11:47:23 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2011-01-19 11:52:13 -0200
commit46b633779b299c7fb3d78f153a5034055f99cd45 (patch)
tree45db9a1313d43a9438f105f3d257cc592cf050a6 /drivers/media
parent6ce3ced4f73e3f0c345f47dc99fd21f2248724a8 (diff)
downloadlinux-2.6.38-lt-ux500-46b633779b299c7fb3d78f153a5034055f99cd45.tar.gz
[media] v4l2-dev: don't memset video_device.dev
Zeroing video_device.dev causes a memory leak if video_set_drvdata was called before video_register_device was called. video_set_drvdata calls dev_set_drvdata which allocates video_device.dev.p. memsetting this will prevent freeing of that memory. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/video/v4l2-dev.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c
index 359e23290a7..341764a3a99 100644
--- a/drivers/media/video/v4l2-dev.c
+++ b/drivers/media/video/v4l2-dev.c
@@ -419,6 +419,10 @@ static int get_index(struct video_device *vdev)
* The registration code assigns minor numbers and device node numbers
* based on the requested type and registers the new device node with
* the kernel.
+ *
+ * This function assumes that struct video_device was zeroed when it
+ * was allocated and does not contain any stale date.
+ *
* An error is returned if no free minor or device node number could be
* found, or if the registration of the device node failed.
*
@@ -440,7 +444,6 @@ static int __video_register_device(struct video_device *vdev, int type, int nr,
int minor_offset = 0;
int minor_cnt = VIDEO_NUM_DEVICES;
const char *name_base;
- void *priv = vdev->dev.p;
/* A minor value of -1 marks this video device as never
having been registered */
@@ -559,10 +562,6 @@ static int __video_register_device(struct video_device *vdev, int type, int nr,
}
/* Part 4: register the device with sysfs */
- memset(&vdev->dev, 0, sizeof(vdev->dev));
- /* The memset above cleared the device's device_private, so
- put back the copy we made earlier. */
- vdev->dev.p = priv;
vdev->dev.class = &video_class;
vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor);
if (vdev->parent)