static void qeth_qdio_cq_handler(struct qeth_card *card,
		unsigned int qdio_err,
		unsigned int queue, int first_element, int count) {
	struct qeth_qdio_q *cq = card->qdio.c_q;
	int i;
	int rc;

	if (!qeth_is_cq(card, queue))
		goto out;

	QETH_CARD_TEXT_(card, 5, "qcqhe%d", first_element);
	QETH_CARD_TEXT_(card, 5, "qcqhc%d", count);
	QETH_CARD_TEXT_(card, 5, "qcqherr%d", qdio_err);

	if (qdio_err) {
		netif_stop_queue(card->dev);
		qeth_schedule_recovery(card);
		goto out;
	}

	if (card->options.performance_stats) {
		card->perf_stats.cq_cnt++;
		card->perf_stats.cq_start_time = qeth_get_micros();
	}

	for (i = first_element; i < first_element + count; ++i) {
		int bidx = i % QDIO_MAX_BUFFERS_PER_Q;
		struct qdio_buffer *buffer = &cq->qdio_bufs[bidx];
		int e;

		e = 0;
		while (buffer->element[e].addr) {
			unsigned long phys_aob_addr;

			phys_aob_addr = (unsigned long) buffer->element[e].addr;
			qeth_qdio_handle_aob(card, phys_aob_addr);
			buffer->element[e].addr = NULL;
			buffer->element[e].eflags = 0;
			buffer->element[e].sflags = 0;
			buffer->element[e].length = 0;

			++e;
		}

		buffer->element[15].eflags = 0;
		buffer->element[15].sflags = 0;
	}
	rc = do_QDIO(CARD_DDEV(card), QDIO_FLAG_SYNC_INPUT, queue,
		    card->qdio.c_q->next_buf_to_init,
		    count);
	if (rc) {
		dev_warn(&card->gdev->dev,
			"QDIO reported an error, rc=%i\n", rc);
		QETH_CARD_TEXT(card, 2, "qcqherr");
	}
	card->qdio.c_q->next_buf_to_init = (card->qdio.c_q->next_buf_to_init
				   + count) % QDIO_MAX_BUFFERS_PER_Q;

	netif_wake_queue(card->dev);

	if (card->options.performance_stats) {
		int delta_t = qeth_get_micros();
		delta_t -= card->perf_stats.cq_start_time;
		card->perf_stats.cq_time += delta_t;
	}
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.