static void tg3_setup_flow_control(struct tg3 *tp, u32 lcladv, u32 rmtadv)
{
	u8 autoneg;
	u8 flowctrl = 0;
	u32 old_rx_mode = tp->rx_mode;
	u32 old_tx_mode = tp->tx_mode;

	if (tg3_flag(tp, USE_PHYLIB))
		autoneg = tp->mdio_bus->phy_map[TG3_PHY_MII_ADDR]->autoneg;
	else
		autoneg = tp->link_config.autoneg;

	if (autoneg == AUTONEG_ENABLE && tg3_flag(tp, PAUSE_AUTONEG)) {
		if (tp->phy_flags & TG3_PHYFLG_ANY_SERDES)
			flowctrl = tg3_resolve_flowctrl_1000X(lcladv, rmtadv);
		else
			flowctrl = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
	} else
		flowctrl = tp->link_config.flowctrl;

	tp->link_config.active_flowctrl = flowctrl;

	if (flowctrl & FLOW_CTRL_RX)
		tp->rx_mode |= RX_MODE_FLOW_CTRL_ENABLE;
	else
		tp->rx_mode &= ~RX_MODE_FLOW_CTRL_ENABLE;

	if (old_rx_mode != tp->rx_mode)
		tw32_f(MAC_RX_MODE, tp->rx_mode);

	if (flowctrl & FLOW_CTRL_TX)
		tp->tx_mode |= TX_MODE_FLOW_CTRL_ENABLE;
	else
		tp->tx_mode &= ~TX_MODE_FLOW_CTRL_ENABLE;

	if (old_tx_mode != tp->tx_mode)
		tw32_f(MAC_TX_MODE, tp->tx_mode);
}

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.