int qeth_get_elements_no(struct qeth_card *card,
		     struct sk_buff *skb, int elems)
{
	int dlen = skb->len - skb->data_len;
	int elements_needed = PFN_UP((unsigned long)skb->data + dlen - 1) -
		PFN_DOWN((unsigned long)skb->data);

	elements_needed += qeth_get_elements_for_frags(skb);

	if ((elements_needed + elems) > QETH_MAX_BUFFER_ELEMENTS(card)) {
		QETH_DBF_MESSAGE(2, "Invalid size of IP packet "
			"(Number=%d / Length=%d). Discarded.\n",
			(elements_needed+elems), skb->len);
		return 0;
	}
	return elements_needed;
}

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.