[media] vb2: Allow queuing OUTPUT buffers with zeroed 'bytesused'

Modify the bytesused/data_offset check to not fail if both bytesused
and data_offset is set to 0. This should minimize possible issues in
existing applications which worked before we enforced the plane lengths
for output buffers checks introduced in commit 8023ed09cb278004a2
"videobuf2-core: Verify planes lengths for output buffers"

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index 594c75eab5a5..de0e87f0b2c3 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -353,7 +353,9 @@ static int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b)
 
                         if (b->m.planes[plane].bytesused > length)
                                 return -EINVAL;
-                        if (b->m.planes[plane].data_offset >=
+
+                        if (b->m.planes[plane].data_offset > 0 &&
+                            b->m.planes[plane].data_offset >=
                             b->m.planes[plane].bytesused)
                                 return -EINVAL;
                 }