static void qeth_determine_capabilities(struct qeth_card *card)
{
	int rc;
	int length;
	char *prcd;
	struct ccw_device *ddev;
	int ddev_offline = 0;

	QETH_DBF_TEXT(SETUP, 2, "detcapab");
	ddev = CARD_DDEV(card);
	if (!ddev->online) {
		ddev_offline = 1;
		rc = ccw_device_set_online(ddev);
		if (rc) {
			QETH_DBF_TEXT_(SETUP, 2, "3err%d", rc);
			goto out;
		}
	}

	rc = qeth_read_conf_data(card, (void **) &prcd, &length);
	if (rc) {
		QETH_DBF_MESSAGE(2, "%s qeth_read_conf_data returned %i\n",
			dev_name(&card->gdev->dev), rc);
		QETH_DBF_TEXT_(SETUP, 2, "5err%d", rc);
		goto out_offline;
	}
	qeth_configure_unitaddr(card, prcd);
	if (ddev_offline)
		qeth_configure_blkt_default(card, prcd);
	kfree(prcd);

	rc = qdio_get_ssqd_desc(ddev, &card->ssqd);
	if (rc)
		QETH_DBF_TEXT_(SETUP, 2, "6err%d", rc);

	QETH_DBF_TEXT_(SETUP, 2, "qfmt%d", card->ssqd.qfmt);
	QETH_DBF_TEXT_(SETUP, 2, "%d", card->ssqd.qdioac1);
	QETH_DBF_TEXT_(SETUP, 2, "%d", card->ssqd.qdioac3);
	QETH_DBF_TEXT_(SETUP, 2, "icnt%d", card->ssqd.icnt);
	if (!((card->ssqd.qfmt != QDIO_IQDIO_QFMT) ||
	    ((card->ssqd.qdioac1 & CHSC_AC1_INITIATE_INPUTQ) == 0) ||
	    ((card->ssqd.qdioac3 & CHSC_AC3_FORMAT2_CQ_AVAILABLE) == 0))) {
		dev_info(&card->gdev->dev,
			"Completion Queueing supported\n");
	} else {
		card->options.cq = QETH_CQ_NOTAVAILABLE;
	}


out_offline:
	if (ddev_offline == 1)
		ccw_device_set_offline(ddev);
out:
	return;
}

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.