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 void http1_on_ready(intptr_t uuid, fio_protocol_s *protocol) {
  /* resume slow clients from suspension */
  http1pr_s *p = (http1pr_s *)protocol;
  if ((p->stop & 4)) {
    p->stop ^= 4;
    fio_force_event(uuid, FIO_EVENT_ON_DATA);
  }
  (void)protocol;
}