Commit 687a0400 authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Dave Airlie
Browse files

drm: plane: Check crtc coordinates against integer overflows in setplane ioctl



Help drivers a little by guaranteeing that crtc_x+crtc_w and
crtc_y+crtc_h don't overflow.
Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 42ef8789
......@@ -1732,6 +1732,18 @@ int drm_mode_setplane(struct drm_device *dev, void *data,
goto out;
}
/* Give drivers some help against integer overflows */
if (plane_req->crtc_w > INT_MAX ||
plane_req->crtc_x > INT_MAX - (int32_t) plane_req->crtc_w ||
plane_req->crtc_h > INT_MAX ||
plane_req->crtc_y > INT_MAX - (int32_t) plane_req->crtc_h) {
DRM_DEBUG_KMS("Invalid CRTC coordinates %ux%u+%d+%d\n",
plane_req->crtc_w, plane_req->crtc_h,
plane_req->crtc_x, plane_req->crtc_y);
ret = -ERANGE;
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,
......
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