void MemoryMappedFile::CloseHandles() {
  base::ThreadRestrictions::AssertIOAllowed();

  if (data_ != NULL)
    munmap(data_, length_);
  if (file_ != base::kInvalidPlatformFileValue)
    ignore_result(HANDLE_EINTR(close(file_)));

  data_ = NULL;
  length_ = 0;
  file_ = base::kInvalidPlatformFileValue;
}

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.