GraphicsLayer* RenderLayerCompositor::fixedRootBackgroundLayer() const
{
    RenderLayer* viewLayer = m_renderView->layer();
    if (!viewLayer)
        return 0;

    if (viewLayer->compositingState() == PaintsIntoOwnBacking && viewLayer->compositedLayerMapping()->backgroundLayerPaintsFixedRootBackground())
        return viewLayer->compositedLayerMapping()->backgroundLayer();

    return 0;
}

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.