void DownloadManagerImpl::GetNextId(const DownloadIdCallback& callback) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  if (delegate_) {
    delegate_->GetNextId(callback);
    return;
  }
  static uint32_t next_id = content::DownloadItem::kInvalidId + 1;
  callback.Run(next_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.