static inline void FixupRef(const std::string& text,
                            const url_parse::Component& part,
                            std::string* url) {
  if (!part.is_valid())
    return;

  url->append("#");
  url->append(text, part.begin, part.len);
}

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.