_dbus_win_startup_winsock (void)
{
  /* Straight from MSDN, deuglified */

  static dbus_bool_t beenhere = FALSE;

  WORD wVersionRequested;
  WSADATA wsaData;
  int err;

  if (beenhere)
    return;

  wVersionRequested = MAKEWORD (2, 0);

  err = WSAStartup (wVersionRequested, &wsaData);
  if (err != 0)
    {
      _dbus_assert_not_reached ("Could not initialize WinSock");
      _dbus_abort ();
    }

  /* Confirm that the WinSock DLL supports 2.0.  Note that if the DLL
   * supports versions greater than 2.0 in addition to 2.0, it will
   * still return 2.0 in wVersion since that is the version we
   * requested.
   */
  if (LOBYTE (wsaData.wVersion) != 2 ||
      HIBYTE (wsaData.wVersion) != 0)
    {
      _dbus_assert_not_reached ("No usable WinSock found");
      _dbus_abort ();
    }

  beenhere = TRUE;
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.