[RESEND][PATCH] drm/radeon: check incoming cliprects pointer

[Alex Deucher]

On Mon, May 13, 2013 at 1:00 AM, Kees Cook <keescook at chromium.org> wrote:
> The "boxes" parameter points into userspace memory. It should be verified
> like any other operation against user memory.
>
> Signed-off-by: Kees Cook <keescook at chromium.org>
> Cc: stable at vger.kernel.org

Thanks.  Applied.

Alex

> ---
>  drivers/gpu/drm/radeon/r300_cmdbuf.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/radeon/r300_cmdbuf.c b/drivers/gpu/drm/radeon/r300_cmdbuf.c
> index 865e2c9..60170ea 100644
> --- a/drivers/gpu/drm/radeon/r300_cmdbuf.c
> +++ b/drivers/gpu/drm/radeon/r300_cmdbuf.c
> @@ -75,7 +75,7 @@ static int r300_emit_cliprects(drm_radeon_private_t *dev_priv,
>                 OUT_RING(CP_PACKET0(R300_RE_CLIPRECT_TL_0, nr * 2 - 1));
>
>                 for (i = 0; i < nr; ++i) {
> -                       if (DRM_COPY_FROM_USER_UNCHECKED
> +                       if (DRM_COPY_FROM_USER
>                             (&box, &cmdbuf->boxes[n + i], sizeof(box))) {
>                                 DRM_ERROR("copy cliprect faulted\n");
>                                 return -EFAULT;
> --
> 1.7.9.5
>
>
> --
> Kees Cook
> Chrome OS Security
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