void RenderLayerCompositor::rootFixedBackgroundsChanged()
{
    if (!supportsFixedRootBackgroundCompositing())
        return;

    if (GraphicsLayer* backgroundLayer = fixedRootBackgroundLayer())
        m_containerLayer->addChildBelow(backgroundLayer, m_scrollLayer.get());
}

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.