[media] media: vb2: add length check for mmap

The length of mmap() can be bigger than length of vb2 buffer, so
it should be checked.

Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index 02bb5e7..58c1744 100644 (file)
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -1886,6 +1886,11 @@ int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma)
 
        vb = q->bufs[buffer];
 
+       if (vb->v4l2_planes[plane].length < (vma->vm_end - vma->vm_start)) {
+               dprintk(1, "Invalid length\n");
+               return -EINVAL;
+       }
+
        ret = call_memop(q, mmap, vb->planes[plane].mem_priv, vma);
        if (ret)
                return ret;