The plane_length is an unsigned integer. So, if we have a size of
0xffffffff bytes we incorrectly allocate 0 bytes instead of 1 << 32.
Suggested-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 7f8414594e47 ("[media] media: videobuf2: fix the length check for mmap")
Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
---
drivers/media/common/videobuf2/videobuf2-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index 543da515c761..876db5886867 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -2256,7 +2256,7 @@ int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma)
* The buffer length was page_aligned at __vb2_buf_mem_alloc(),
* so, we need to do the same here.
*/
- length = PAGE_ALIGN(vb->planes[plane].length);
+ length = PAGE_ALIGN((unsigned int)vb->planes[plane].length);
if (length < (vma->vm_end - vma->vm_start)) {
dprintk(q, 1,
"MMAP invalid, as it would overflow buffer length\n");
--
2.30.1.766.gb4fecdf3b7-goog
