bool DirectoryExists(const FilePath& path) {
  base::ThreadRestrictions::AssertIOAllowed();
  stat_wrapper_t file_info;
  if (CallStat(path.value().c_str(), &file_info) == 0)
    return S_ISDIR(file_info.st_mode);
  return false;
}

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.