static int tg3_phy_init(struct tg3 *tp)
{
	struct phy_device *phydev;

	if (tp->phy_flags & TG3_PHYFLG_IS_CONNECTED)
		return 0;

	/* Bring the PHY back to a known state. */
	tg3_bmcr_reset(tp);

	phydev = tp->mdio_bus->phy_map[TG3_PHY_MII_ADDR];

	/* Attach the MAC to the PHY. */
	phydev = phy_connect(tp->dev, dev_name(&phydev->dev),
			     tg3_adjust_link, phydev->interface);
	if (IS_ERR(phydev)) {
		dev_err(&tp->pdev->dev, "Could not attach to PHY\n");
		return PTR_ERR(phydev);
	}

	/* Mask with MAC supported features. */
	switch (phydev->interface) {
	case PHY_INTERFACE_MODE_GMII:
	case PHY_INTERFACE_MODE_RGMII:
		if (!(tp->phy_flags & TG3_PHYFLG_10_100_ONLY)) {
			phydev->supported &= (PHY_GBIT_FEATURES |
					      SUPPORTED_Pause |
					      SUPPORTED_Asym_Pause);
			break;
		}
		/* fallthru */
	case PHY_INTERFACE_MODE_MII:
		phydev->supported &= (PHY_BASIC_FEATURES |
				      SUPPORTED_Pause |
				      SUPPORTED_Asym_Pause);
		break;
	default:
		phy_disconnect(tp->mdio_bus->phy_map[TG3_PHY_MII_ADDR]);
		return -EINVAL;
	}

	tp->phy_flags |= TG3_PHYFLG_IS_CONNECTED;

	phydev->advertising = phydev->supported;

	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.