static int tg3_get_eeprom(struct net_device *dev, struct ethtool_eeprom *eeprom, u8 *data)
{
	struct tg3 *tp = netdev_priv(dev);
	int ret;
	u8  *pd;
	u32 i, offset, len, b_offset, b_count;
	__be32 val;

	if (tg3_flag(tp, NO_NVRAM))
		return -EINVAL;

	if (tp->phy_flags & TG3_PHYFLG_IS_LOW_POWER)
		return -EAGAIN;

	offset = eeprom->offset;
	len = eeprom->len;
	eeprom->len = 0;

	eeprom->magic = TG3_EEPROM_MAGIC;

	if (offset & 3) {
		/* adjustments to start on required 4 byte boundary */
		b_offset = offset & 3;
		b_count = 4 - b_offset;
		if (b_count > len) {
			/* i.e. offset=1 len=2 */
			b_count = len;
		}
		ret = tg3_nvram_read_be32(tp, offset-b_offset, &val);
		if (ret)
			return ret;
		memcpy(data, ((char *)&val) + b_offset, b_count);
		len -= b_count;
		offset += b_count;
		eeprom->len += b_count;
	}

	/* read bytes up to the last 4 byte boundary */
	pd = &data[eeprom->len];
	for (i = 0; i < (len - (len & 3)); i += 4) {
		ret = tg3_nvram_read_be32(tp, offset + i, &val);
		if (ret) {
			eeprom->len += i;
			return ret;
		}
		memcpy(pd + i, &val, 4);
	}
	eeprom->len += i;

	if (len & 3) {
		/* read last bytes not ending on 4 byte boundary */
		pd = &data[eeprom->len];
		b_count = len & 3;
		b_offset = offset + len - b_count;
		ret = tg3_nvram_read_be32(tp, b_offset, &val);
		if (ret)
			return ret;
		memcpy(pd, &val, b_count);
		eeprom->len += b_count;
	}
	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.