[media] videobuf2-core: fill in length field for multiplanar buffers

length should be set to num_planes in __fill_v4l2_buffer(). That way the
caller knows how many planes there are in the buffer.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index 5a132b286894..432df119af27 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -348,6 +348,7 @@ static void __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b)
                  * Fill in plane-related data if userspace provided an array
                  * for it. The caller has already verified memory and size.
                  */
+                b->length = vb->num_planes;
                 memcpy(b->m.planes, vb->v4l2_planes,
                         b->length * sizeof(struct v4l2_plane));
         } else {