bool RenderLayerCompositor::needsFixedRootBackgroundLayer(const RenderLayer* layer) const
{
    if (layer != m_renderView->layer())
        return false;

    return supportsFixedRootBackgroundCompositing() && m_renderView->rootBackgroundIsEntirelyFixed();
}

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.