void ChromeDownloadManagerDelegate::ReturnNextId(
    const content::DownloadIdCallback& callback) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  DCHECK(!profile_->IsOffTheRecord());
  DCHECK_NE(content::DownloadItem::kInvalidId, next_download_id_);
  callback.Run(next_download_id_++);
}

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.