void DownloadManagerImpl::OnFileExistenceChecked(uint32_t download_id,
                                                 bool result) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  if (!result) {  // File does not exist.
    if (base::ContainsKey(downloads_, download_id))
      downloads_[download_id]->OnDownloadedFileRemoved();
  }
}

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.