Messages in this thread | | | Subject | Re: [PATCH] media: videobuf2: Fix integer overrun in vb2_mmap | From | Jiri Slaby <> | Date | Wed, 10 Mar 2021 08:47:51 +0100 |
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On 10. 03. 21, 8:40, Ricardo Ribalda wrote: > 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") > 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..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);
Hi,
I fail to see how case from uint to uint helps -- IOW, did you mean ulong?
regards, -- js suse labs
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