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index : net-next.git | |
| net-next plumbings | Tobias Klauser |
| summaryrefslogtreecommitdiff |
| author | Sakari Ailus <sakari.ailus@linux.intel.com> | 2016-04-03 16:31:03 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2016-04-13 16:20:01 -0300 |
| commit | 2c1f6951a8a82e6de0d82b1158b5e493fc6c54ab (patch) | |
| tree | 78e2a25eed9562278421f656904ebe8f30eff863 /Documentation/dcdbas.txt | |
| parent | e7e0c3e26587749b62d17b9dd0532874186c77f7 (diff) | |
[media] videobuf2-v4l2: Verify planes array in buffer dequeueing
When a buffer is being dequeued using VIDIOC_DQBUF IOCTL, the exact buffer
which will be dequeued is not known until the buffer has been removed from
the queue. The number of planes is specific to a buffer, not to the queue.
This does lead to the situation where multi-plane buffers may be requested
and queued with n planes, but VIDIOC_DQBUF IOCTL may be passed an argument
struct with fewer planes.
__fill_v4l2_buffer() however uses the number of planes from the dequeued
videobuf2 buffer, overwriting kernel memory (the m.planes array allocated
in video_usercopy() in v4l2-ioctl.c) if the user provided fewer
planes than the dequeued buffer had. Oops!
Fixes: b0e0e1f83de3 ("[media] media: videobuf2: Prepare to divide videobuf2")
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: stable@vger.kernel.org # for v4.4 and later
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'Documentation/dcdbas.txt')