void DownloadManagerImpl::AddUrlDownloadHandler(
    UniqueUrlDownloadHandlerPtr downloader) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  if (downloader)
    url_download_handlers_.push_back(std::move(downloader));
}

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.