Language: C
Label: vulnerable
CWE: CWE-22 \u2014 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
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.

Code:
static struct timespec fio_timer_calc_due(size_t interval) {
  struct timespec now = fio_last_tick();
  if (interval > 1000) {
    now.tv_sec += interval / 1000;
    interval -= interval / 1000;
  }
  now.tv_nsec += (interval * 1000000UL);
  if (now.tv_nsec > 1000000000L) {
    now.tv_nsec -= 1000000000L;
    now.tv_sec += 1;
  }
  return now;
}