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SubjectRe: [PATCH][next] media: usb: pwc-uncompress: Use struct_size() helper in pwc_decompress()
On Thu, Jan 20, 2022 at 03:24:34PM -0600, Gustavo A. R. Silva wrote:
> Make use of the struct_size() helper instead of an open-coded version,
> in order to avoid any potential type mistakes or integer overflows that,
> in the worst scenario, could lead to heap overflows.
>
> Also, address the following sparse warnings:
> drivers/media/usb/pwc/pwc-uncompress.c:44:44: warning: using sizeof on a flexible structure
>
> Link: https://github.com/KSPP/linux/issues/174
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Yup, happy to see these getting changed.

Reviewed-by: Kees Cook <keescook@chromium.org>

> ---
> drivers/media/usb/pwc/pwc-uncompress.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/media/usb/pwc/pwc-uncompress.c b/drivers/media/usb/pwc/pwc-uncompress.c
> index 68bc3829c6b3..faf44cdeb268 100644
> --- a/drivers/media/usb/pwc/pwc-uncompress.c
> +++ b/drivers/media/usb/pwc/pwc-uncompress.c
> @@ -41,7 +41,7 @@ int pwc_decompress(struct pwc_device *pdev, struct pwc_frame_buf *fbuf)
> memcpy(raw_frame->cmd, pdev->cmd_buf, 4);
> memcpy(raw_frame+1, yuv, pdev->frame_size);
> vb2_set_plane_payload(&fbuf->vb.vb2_buf, 0,
> - pdev->frame_size + sizeof(struct pwc_raw_frame));
> + struct_size(raw_frame, rawframe, pdev->frame_size));
> return 0;
> }
>
> --
> 2.27.0
>

--
Kees Cook

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