int qeth_set_access_ctrl_online(struct qeth_card *card, int fallback)
{
	int rc = 0;

	QETH_CARD_TEXT(card, 4, "setactlo");

	if ((card->info.type == QETH_CARD_TYPE_OSD ||
	     card->info.type == QETH_CARD_TYPE_OSX) &&
	     qeth_adp_supported(card, IPA_SETADP_SET_ACCESS_CONTROL)) {
		rc = qeth_setadpparms_set_access_ctrl(card,
			card->options.isolation, fallback);
		if (rc) {
			QETH_DBF_MESSAGE(3,
				"IPA(SET_ACCESS_CTRL,%s,%d) sent failed\n",
				card->gdev->dev.kobj.name,
				rc);
			rc = -EOPNOTSUPP;
		}
	} else if (card->options.isolation != ISOLATION_MODE_NONE) {
		card->options.isolation = ISOLATION_MODE_NONE;

		dev_err(&card->gdev->dev, "Adapter does not "
			"support QDIO data connection isolation\n");
		rc = -EOPNOTSUPP;
	}
	return rc;
}

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.