static long __qeth_check_irb_error(struct ccw_device *cdev,
		unsigned long intparm, struct irb *irb)
{
	struct qeth_card *card;

	card = CARD_FROM_CDEV(cdev);

	if (!IS_ERR(irb))
		return 0;

	switch (PTR_ERR(irb)) {
	case -EIO:
		QETH_DBF_MESSAGE(2, "%s i/o-error on device\n",
			dev_name(&cdev->dev));
		QETH_CARD_TEXT(card, 2, "ckirberr");
		QETH_CARD_TEXT_(card, 2, "  rc%d", -EIO);
		break;
	case -ETIMEDOUT:
		dev_warn(&cdev->dev, "A hardware operation timed out"
			" on the device\n");
		QETH_CARD_TEXT(card, 2, "ckirberr");
		QETH_CARD_TEXT_(card, 2, "  rc%d", -ETIMEDOUT);
		if (intparm == QETH_RCD_PARM) {
			if (card && (card->data.ccwdev == cdev)) {
				card->data.state = CH_STATE_DOWN;
				wake_up(&card->wait_q);
			}
		}
		break;
	default:
		QETH_DBF_MESSAGE(2, "%s unknown error %ld on device\n",
			dev_name(&cdev->dev), PTR_ERR(irb));
		QETH_CARD_TEXT(card, 2, "ckirberr");
		QETH_CARD_TEXT(card, 2, "  rc???");
	}
	return PTR_ERR(irb);
}

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.