From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
The videobuf2-core did not zero the 'planes' array in __qbuf_userptr()
and __qbuf_dmabuf(). That's now memset to 0. Without this the reserved
array in struct v4l2_plane would be non-zero, causing v4l2-compliance
errors.
More serious is the fact that data_offset was not handled correctly:
- for capture devices it was never zeroed, which meant that it was
uninitialized. Unless the driver sets it it was a completely random
number. With the memset above this is now fixed.
- __qbuf_dmabuf had a completely incorrect length check that included
data_offset.
- in __fill_vb2_buffer in the DMABUF case the data_offset field was
unconditionally copied from v4l2_buffer to v4l2_plane when this
should only happen in the output case.
- in the single-planar case data_offset was never correctly set to 0.
The single-planar API doesn't support data_offset, so setting it
to 0 is the right thing to do. This too is now solved by the memset.
All these issues were found with v4l2-compliance.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
drivers/media/v4l2-core/videobuf2-core.c | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)
diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index f9059bb..596998e 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -1169,8 +1169,6 @@ static void __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b
b->m.planes[plane].m.fd;
v4l2_planes[plane].length =
b->m.planes[plane].length;
- v4l2_planes[plane].data_offset =
- b->m.planes[plane].data_offset;
}
}
} else {
@@ -1180,10 +1178,8 @@ static void __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b
* In videobuf we use our internal V4l2_planes struct for
* single-planar buffers as well, for simplicity.
*/
- if (V4L2_TYPE_IS_OUTPUT(b->type)) {
+ if (V4L2_TYPE_IS_OUTPUT(b->type))
v4l2_planes[0].bytesused = b->bytesused;
- v4l2_planes[0].data_offset = 0;
- }
if (b->memory == V4L2_MEMORY_USERPTR) {
v4l2_planes[0].m.userptr = b->m.userptr;
@@ -1193,9 +1189,7 @@ static void __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b
if (b->memory == V4L2_MEMORY_DMABUF) {
v4l2_planes[0].m.fd = b->m.fd;
v4l2_planes[0].length = b->length;
- v4l2_planes[0].data_offset = 0;
}
-
}
/* Zero flags that the vb2 core handles */
@@ -1238,6 +1232,7 @@ static int __qbuf_userptr(struct vb2_buffer *vb, const struct v4l2_buffer *b)
int write = !V4L2_TYPE_IS_OUTPUT(q->type);
bool reacquired = vb->planes[0].mem_priv == NULL;
+ memset(planes, 0, sizeof(planes[0]) * vb->num_planes);
/* Copy relevant information provided by the userspace */
__fill_vb2_buffer(vb, b, planes);
@@ -1357,6 +1352,7 @@ static int __qbuf_dmabuf(struct vb2_buffer *vb, const struct v4l2_buffer *b)
int write = !V4L2_TYPE_IS_OUTPUT(q->type);
bool reacquired = vb->planes[0].mem_priv == NULL;
+ memset(planes, 0, sizeof(planes[0]) * vb->num_planes);
/* Copy relevant information provided by the userspace */
__fill_vb2_buffer(vb, b, planes);
@@ -1374,8 +1370,7 @@ static int __qbuf_dmabuf(struct vb2_buffer *vb, const struct v4l2_buffer *b)
if (planes[plane].length == 0)
planes[plane].length = dbuf->size;
- if (planes[plane].length < planes[plane].data_offset +
- q->plane_sizes[plane]) {
+ if (planes[plane].length < q->plane_sizes[plane]) {
dprintk(1, "qbuf: invalid dmabuf length for plane %d\n",
plane);
ret = -EINVAL;
--
1.9.1
--
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