void Document::explicitClose()
{
    if (RefPtrWillBeRawPtr<DocumentParser> parser = m_parser)
        parser->finish();

    if (!m_frame) {
        implicitClose();
        return;
    }

    m_frame->loader().checkCompleted();
}

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.