int qeth_change_mtu(struct net_device *dev, int new_mtu)
{
	struct qeth_card *card;
	char dbf_text[15];

	card = dev->ml_priv;

	QETH_CARD_TEXT(card, 4, "chgmtu");
	sprintf(dbf_text, "%8x", new_mtu);
	QETH_CARD_TEXT(card, 4, dbf_text);

	if (new_mtu < 64)
		return -EINVAL;
	if (new_mtu > 65535)
		return -EINVAL;
	if ((!qeth_is_supported(card, IPA_IP_FRAGMENTATION)) &&
	    (!qeth_mtu_is_valid(card, new_mtu)))
		return -EINVAL;
	dev->mtu = new_mtu;
	return 0;
}

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.