static int tg3_change_mtu(struct net_device *dev, int new_mtu)
{
	struct tg3 *tp = netdev_priv(dev);
	int err, reset_phy = 0;

	if (new_mtu < TG3_MIN_MTU || new_mtu > TG3_MAX_MTU(tp))
		return -EINVAL;

	if (!netif_running(dev)) {
		/* We'll just catch it later when the
		 * device is up'd.
		 */
		tg3_set_mtu(dev, tp, new_mtu);
		return 0;
	}

	tg3_phy_stop(tp);

	tg3_netif_stop(tp);

	tg3_full_lock(tp, 1);

	tg3_halt(tp, RESET_KIND_SHUTDOWN, 1);

	tg3_set_mtu(dev, tp, new_mtu);

	/* Reset PHY, otherwise the read DMA engine will be in a mode that
	 * breaks all requests to 256 bytes.
	 */
	if (tg3_asic_rev(tp) == ASIC_REV_57766)
		reset_phy = 1;

	err = tg3_restart_hw(tp, reset_phy);

	if (!err)
		tg3_netif_start(tp);

	tg3_full_unlock(tp);

	if (!err)
		tg3_phy_start(tp);

	return err;
}

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.