Messages in this thread Patch in this message | | | From | Ricardo Ribalda <> | Subject | [PATCH v2] media: videobuf2: Fix integer overrun in vb2_mmap | Date | Wed, 10 Mar 2021 08:51:27 +0100 |
| |
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@chromium.org> Cc: stable@vger.kernel.org Fixes: 7f8414594e47 ("[media] media: videobuf2: fix the length check for mmap") Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org> --- 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..89c8bacb94a7 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 long)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
| |