drm/radeon: check incoming cliprects pointer
Kees Cook [Mon, 13 May 2013 05:00:51 +0000 (22:00 -0700)]
commit fefaedcfb82d2e57c2320acf60604ab03b750cc0 upstream.

The "boxes" parameter points into userspace memory. It should be verified
like any other operation against user memory.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/gpu/drm/radeon/r300_cmdbuf.c

index 1fe98b4..9aa02be 100644 (file)
@@ -74,7 +74,7 @@ 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;