static void __tg3_set_rx_mode(struct net_device *dev)
{
	struct tg3 *tp = netdev_priv(dev);
	u32 rx_mode;

	rx_mode = tp->rx_mode & ~(RX_MODE_PROMISC |
				  RX_MODE_KEEP_VLAN_TAG);

#if !defined(CONFIG_VLAN_8021Q) && !defined(CONFIG_VLAN_8021Q_MODULE)
	/* When ASF is in use, we always keep the RX_MODE_KEEP_VLAN_TAG
	 * flag clear.
	 */
	if (!tg3_flag(tp, ENABLE_ASF))
		rx_mode |= RX_MODE_KEEP_VLAN_TAG;
#endif

	if (dev->flags & IFF_PROMISC) {
		/* Promiscuous mode. */
		rx_mode |= RX_MODE_PROMISC;
	} else if (dev->flags & IFF_ALLMULTI) {
		/* Accept all multicast. */
		tg3_set_multi(tp, 1);
	} else if (netdev_mc_empty(dev)) {
		/* Reject all multicast. */
		tg3_set_multi(tp, 0);
	} else {
		/* Accept one or more multicast(s). */
		struct netdev_hw_addr *ha;
		u32 mc_filter[4] = { 0, };
		u32 regidx;
		u32 bit;
		u32 crc;

		netdev_for_each_mc_addr(ha, dev) {
			crc = calc_crc(ha->addr, ETH_ALEN);
			bit = ~crc & 0x7f;
			regidx = (bit & 0x60) >> 5;
			bit &= 0x1f;
			mc_filter[regidx] |= (1 << bit);
		}

		tw32(MAC_HASH_REG_0, mc_filter[0]);
		tw32(MAC_HASH_REG_1, mc_filter[1]);
		tw32(MAC_HASH_REG_2, mc_filter[2]);
		tw32(MAC_HASH_REG_3, mc_filter[3]);
	}

	if (rx_mode != tp->rx_mode) {
		tp->rx_mode = rx_mode;
		tw32_f(MAC_RX_MODE, rx_mode);
		udelay(10);
	}
}

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.