gpgsm_set_locale (void *engine, int category, const char *value)
{
  engine_gpgsm_t gpgsm = engine;
  gpgme_error_t err;
  char *optstr;
  char *catstr;

  /* FIXME: If value is NULL, we need to reset the option to default.
     But we can't do this.  So we error out here.  GPGSM needs support
     for this.  */
  if (0)
    ;
#ifdef LC_CTYPE
  else if (category == LC_CTYPE)
    {
      catstr = "lc-ctype";
      if (!value && gpgsm->lc_ctype_set)
	return gpg_error (GPG_ERR_INV_VALUE);
      if (value)
	gpgsm->lc_ctype_set = 1;
    }
#endif
#ifdef LC_MESSAGES
  else if (category == LC_MESSAGES)
    {
      catstr = "lc-messages";
      if (!value && gpgsm->lc_messages_set)
	return gpg_error (GPG_ERR_INV_VALUE);
      if (value)
	gpgsm->lc_messages_set = 1;
    }
#endif /* LC_MESSAGES */
  else
    return gpg_error (GPG_ERR_INV_VALUE);

  /* FIXME: Reset value to default.  */
  if (!value)
    return 0;

  if (asprintf (&optstr, "OPTION %s=%s", catstr, value) < 0)
    err = gpg_error_from_syserror ();
  else
    {
      err = assuan_transact (gpgsm->assuan_ctx, optstr, NULL, NULL,
			     NULL, NULL, NULL, NULL);
      free (optstr);
    }

  return err;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.