bool NavigatorImpl::StartHistoryNavigationInNewSubframe(
    RenderFrameHostImpl* render_frame_host,
    const GURL& default_url) {
  return controller_->StartHistoryNavigationInNewSubframe(render_frame_host,
                                                          default_url);
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.