drm: plane: Check source coordinates

Make sure the source coordinates stay within the buffer.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index d9bf9d8..1242e12 100644 (file)
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -1661,6 +1661,7 @@ int drm_mode_setplane(struct drm_device *dev, void *data,
        struct drm_crtc *crtc;
        struct drm_framebuffer *fb;
        int ret = 0;
+       unsigned int fb_width, fb_height;
 
        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -EINVAL;
@@ -1709,6 +1710,28 @@ int drm_mode_setplane(struct drm_device *dev, void *data,
        }
        fb = obj_to_fb(obj);
 
+       fb_width = fb->width << 16;
+       fb_height = fb->height << 16;
+
+       /* Make sure source coordinates are inside the fb. */
+       if (plane_req->src_w > fb_width ||
+           plane_req->src_x > fb_width - plane_req->src_w ||
+           plane_req->src_h > fb_height ||
+           plane_req->src_y > fb_height - plane_req->src_h) {
+               DRM_DEBUG_KMS("Invalid source coordinates "
+                             "%u.%06ux%u.%06u+%u.%06u+%u.%06u\n",
+                             plane_req->src_w >> 16,
+                             ((plane_req->src_w & 0xffff) * 15625) >> 10,
+                             plane_req->src_h >> 16,
+                             ((plane_req->src_h & 0xffff) * 15625) >> 10,
+                             plane_req->src_x >> 16,
+                             ((plane_req->src_x & 0xffff) * 15625) >> 10,
+                             plane_req->src_y >> 16,
+                             ((plane_req->src_y & 0xffff) * 15625) >> 10);
+               ret = -ENOSPC;
+               goto out;
+       }
+
        ret = plane->funcs->update_plane(plane, crtc, fb,
                                         plane_req->crtc_x, plane_req->crtc_y,
                                         plane_req->crtc_w, plane_req->crtc_h,