static int tg3_hwtstamp_ioctl(struct net_device *dev,
			      struct ifreq *ifr, int cmd)
{
	struct tg3 *tp = netdev_priv(dev);
	struct hwtstamp_config stmpconf;

	if (!tg3_flag(tp, PTP_CAPABLE))
		return -EINVAL;

	if (copy_from_user(&stmpconf, ifr->ifr_data, sizeof(stmpconf)))
		return -EFAULT;

	if (stmpconf.flags)
		return -EINVAL;

	switch (stmpconf.tx_type) {
	case HWTSTAMP_TX_ON:
		tg3_flag_set(tp, TX_TSTAMP_EN);
		break;
	case HWTSTAMP_TX_OFF:
		tg3_flag_clear(tp, TX_TSTAMP_EN);
		break;
	default:
		return -ERANGE;
	}

	switch (stmpconf.rx_filter) {
	case HWTSTAMP_FILTER_NONE:
		tp->rxptpctl = 0;
		break;
	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
		tp->rxptpctl = TG3_RX_PTP_CTL_RX_PTP_V1_EN |
			       TG3_RX_PTP_CTL_ALL_V1_EVENTS;
		break;
	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
		tp->rxptpctl = TG3_RX_PTP_CTL_RX_PTP_V1_EN |
			       TG3_RX_PTP_CTL_SYNC_EVNT;
		break;
	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
		tp->rxptpctl = TG3_RX_PTP_CTL_RX_PTP_V1_EN |
			       TG3_RX_PTP_CTL_DELAY_REQ;
		break;
	case HWTSTAMP_FILTER_PTP_V2_EVENT:
		tp->rxptpctl = TG3_RX_PTP_CTL_RX_PTP_V2_EN |
			       TG3_RX_PTP_CTL_ALL_V2_EVENTS;
		break;
	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
		tp->rxptpctl = TG3_RX_PTP_CTL_RX_PTP_V2_L2_EN |
			       TG3_RX_PTP_CTL_ALL_V2_EVENTS;
		break;
	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
		tp->rxptpctl = TG3_RX_PTP_CTL_RX_PTP_V2_L4_EN |
			       TG3_RX_PTP_CTL_ALL_V2_EVENTS;
		break;
	case HWTSTAMP_FILTER_PTP_V2_SYNC:
		tp->rxptpctl = TG3_RX_PTP_CTL_RX_PTP_V2_EN |
			       TG3_RX_PTP_CTL_SYNC_EVNT;
		break;
	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
		tp->rxptpctl = TG3_RX_PTP_CTL_RX_PTP_V2_L2_EN |
			       TG3_RX_PTP_CTL_SYNC_EVNT;
		break;
	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
		tp->rxptpctl = TG3_RX_PTP_CTL_RX_PTP_V2_L4_EN |
			       TG3_RX_PTP_CTL_SYNC_EVNT;
		break;
	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
		tp->rxptpctl = TG3_RX_PTP_CTL_RX_PTP_V2_EN |
			       TG3_RX_PTP_CTL_DELAY_REQ;
		break;
	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
		tp->rxptpctl = TG3_RX_PTP_CTL_RX_PTP_V2_L2_EN |
			       TG3_RX_PTP_CTL_DELAY_REQ;
		break;
	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
		tp->rxptpctl = TG3_RX_PTP_CTL_RX_PTP_V2_L4_EN |
			       TG3_RX_PTP_CTL_DELAY_REQ;
		break;
	default:
		return -ERANGE;
	}

	if (netif_running(dev) && tp->rxptpctl)
		tw32(TG3_RX_PTP_CTL,
		     tp->rxptpctl | TG3_RX_PTP_CTL_HWTS_INTERLOCK);

	return copy_to_user(ifr->ifr_data, &stmpconf, sizeof(stmpconf)) ?
		-EFAULT : 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.