static void qeth_irq(struct ccw_device *cdev, unsigned long intparm,
		struct irb *irb)
{
	int rc;
	int cstat, dstat;
	struct qeth_cmd_buffer *buffer;
	struct qeth_channel *channel;
	struct qeth_card *card;
	struct qeth_cmd_buffer *iob;
	__u8 index;

	if (__qeth_check_irb_error(cdev, intparm, irb))
		return;
	cstat = irb->scsw.cmd.cstat;
	dstat = irb->scsw.cmd.dstat;

	card = CARD_FROM_CDEV(cdev);
	if (!card)
		return;

	QETH_CARD_TEXT(card, 5, "irq");

	if (card->read.ccwdev == cdev) {
		channel = &card->read;
		QETH_CARD_TEXT(card, 5, "read");
	} else if (card->write.ccwdev == cdev) {
		channel = &card->write;
		QETH_CARD_TEXT(card, 5, "write");
	} else {
		channel = &card->data;
		QETH_CARD_TEXT(card, 5, "data");
	}
	atomic_set(&channel->irq_pending, 0);

	if (irb->scsw.cmd.fctl & (SCSW_FCTL_CLEAR_FUNC))
		channel->state = CH_STATE_STOPPED;

	if (irb->scsw.cmd.fctl & (SCSW_FCTL_HALT_FUNC))
		channel->state = CH_STATE_HALTED;

	/*let's wake up immediately on data channel*/
	if ((channel == &card->data) && (intparm != 0) &&
	    (intparm != QETH_RCD_PARM))
		goto out;

	if (intparm == QETH_CLEAR_CHANNEL_PARM) {
		QETH_CARD_TEXT(card, 6, "clrchpar");
		/* we don't have to handle this further */
		intparm = 0;
	}
	if (intparm == QETH_HALT_CHANNEL_PARM) {
		QETH_CARD_TEXT(card, 6, "hltchpar");
		/* we don't have to handle this further */
		intparm = 0;
	}
	if ((dstat & DEV_STAT_UNIT_EXCEP) ||
	    (dstat & DEV_STAT_UNIT_CHECK) ||
	    (cstat)) {
		if (irb->esw.esw0.erw.cons) {
			dev_warn(&channel->ccwdev->dev,
				"The qeth device driver failed to recover "
				"an error on the device\n");
			QETH_DBF_MESSAGE(2, "%s sense data available. cstat "
				"0x%X dstat 0x%X\n",
				dev_name(&channel->ccwdev->dev), cstat, dstat);
			print_hex_dump(KERN_WARNING, "qeth: irb ",
				DUMP_PREFIX_OFFSET, 16, 1, irb, 32, 1);
			print_hex_dump(KERN_WARNING, "qeth: sense data ",
				DUMP_PREFIX_OFFSET, 16, 1, irb->ecw, 32, 1);
		}
		if (intparm == QETH_RCD_PARM) {
			channel->state = CH_STATE_DOWN;
			goto out;
		}
		rc = qeth_get_problem(cdev, irb);
		if (rc) {
			qeth_clear_ipacmd_list(card);
			qeth_schedule_recovery(card);
			goto out;
		}
	}

	if (intparm == QETH_RCD_PARM) {
		channel->state = CH_STATE_RCD_DONE;
		goto out;
	}
	if (intparm) {
		buffer = (struct qeth_cmd_buffer *) __va((addr_t)intparm);
		buffer->state = BUF_STATE_PROCESSED;
	}
	if (channel == &card->data)
		return;
	if (channel == &card->read &&
	    channel->state == CH_STATE_UP)
		qeth_issue_next_read(card);

	iob = channel->iob;
	index = channel->buf_no;
	while (iob[index].state == BUF_STATE_PROCESSED) {
		if (iob[index].callback != NULL)
			iob[index].callback(channel, iob + index);

		index = (index + 1) % QETH_CMD_BUFFER_NO;
	}
	channel->buf_no = index;
out:
	wake_up(&card->wait_q);
	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.