提交 8023ed09 编写于 作者: L Laurent Pinchart 提交者: Mauro Carvalho Chehab

[media] videobuf2-core: Verify planes lengths for output buffers

For output buffers application provide to the kernel the number of bytes
they stored in each plane of the buffer. Verify that the value is
smaller than or equal to the plane length.
Signed-off-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: NHans Verkuil <hans.verkuil@cisco.com>
Acked-by: NPawel Osciak <pawel@osciak.com>
Acked-by: NMarek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>
上级 04074f1f
......@@ -333,6 +333,41 @@ static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer
return 0;
}
/**
* __verify_length() - Verify that the bytesused value for each plane fits in
* the plane length and that the data offset doesn't exceed the bytesused value.
*/
static int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b)
{
unsigned int length;
unsigned int plane;
if (!V4L2_TYPE_IS_OUTPUT(b->type))
return 0;
if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
for (plane = 0; plane < vb->num_planes; ++plane) {
length = (b->memory == V4L2_MEMORY_USERPTR)
? b->m.planes[plane].length
: vb->v4l2_planes[plane].length;
if (b->m.planes[plane].bytesused > length)
return -EINVAL;
if (b->m.planes[plane].data_offset >=
b->m.planes[plane].bytesused)
return -EINVAL;
}
} else {
length = (b->memory == V4L2_MEMORY_USERPTR)
? b->length : vb->v4l2_planes[0].length;
if (b->bytesused > length)
return -EINVAL;
}
return 0;
}
/**
* __buffer_in_use() - return true if the buffer is in use and
* the queue cannot be freed (by the means of REQBUFS(0)) call
......@@ -1167,6 +1202,10 @@ static int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b)
struct vb2_queue *q = vb->vb2_queue;
int ret;
ret = __verify_length(vb, b);
if (ret < 0)
return ret;
switch (q->memory) {
case V4L2_MEMORY_MMAP:
ret = __qbuf_mmap(vb, b);
......
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