static int tg3_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct tg3 *tp = netdev_priv(dev);
	u32 speed = ethtool_cmd_speed(cmd);

	if (tg3_flag(tp, USE_PHYLIB)) {
		struct phy_device *phydev;
		if (!(tp->phy_flags & TG3_PHYFLG_IS_CONNECTED))
			return -EAGAIN;
		phydev = tp->mdio_bus->phy_map[TG3_PHY_MII_ADDR];
		return phy_ethtool_sset(phydev, cmd);
	}

	if (cmd->autoneg != AUTONEG_ENABLE &&
	    cmd->autoneg != AUTONEG_DISABLE)
		return -EINVAL;

	if (cmd->autoneg == AUTONEG_DISABLE &&
	    cmd->duplex != DUPLEX_FULL &&
	    cmd->duplex != DUPLEX_HALF)
		return -EINVAL;

	if (cmd->autoneg == AUTONEG_ENABLE) {
		u32 mask = ADVERTISED_Autoneg |
			   ADVERTISED_Pause |
			   ADVERTISED_Asym_Pause;

		if (!(tp->phy_flags & TG3_PHYFLG_10_100_ONLY))
			mask |= ADVERTISED_1000baseT_Half |
				ADVERTISED_1000baseT_Full;

		if (!(tp->phy_flags & TG3_PHYFLG_ANY_SERDES))
			mask |= ADVERTISED_100baseT_Half |
				ADVERTISED_100baseT_Full |
				ADVERTISED_10baseT_Half |
				ADVERTISED_10baseT_Full |
				ADVERTISED_TP;
		else
			mask |= ADVERTISED_FIBRE;

		if (cmd->advertising & ~mask)
			return -EINVAL;

		mask &= (ADVERTISED_1000baseT_Half |
			 ADVERTISED_1000baseT_Full |
			 ADVERTISED_100baseT_Half |
			 ADVERTISED_100baseT_Full |
			 ADVERTISED_10baseT_Half |
			 ADVERTISED_10baseT_Full);

		cmd->advertising &= mask;
	} else {
		if (tp->phy_flags & TG3_PHYFLG_ANY_SERDES) {
			if (speed != SPEED_1000)
				return -EINVAL;

			if (cmd->duplex != DUPLEX_FULL)
				return -EINVAL;
		} else {
			if (speed != SPEED_100 &&
			    speed != SPEED_10)
				return -EINVAL;
		}
	}

	tg3_full_lock(tp, 0);

	tp->link_config.autoneg = cmd->autoneg;
	if (cmd->autoneg == AUTONEG_ENABLE) {
		tp->link_config.advertising = (cmd->advertising |
					      ADVERTISED_Autoneg);
		tp->link_config.speed = SPEED_UNKNOWN;
		tp->link_config.duplex = DUPLEX_UNKNOWN;
	} else {
		tp->link_config.advertising = 0;
		tp->link_config.speed = speed;
		tp->link_config.duplex = cmd->duplex;
	}

	if (netif_running(dev))
		tg3_setup_phy(tp, 1);

	tg3_full_unlock(tp);

	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.