bool SetCurrentDirectory(const FilePath& path) {
  base::ThreadRestrictions::AssertIOAllowed();
  int ret = chdir(path.value().c_str());
  return !ret;
}

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.