static u64 tg3_calc_crc_errors(struct tg3 *tp)
{
	struct tg3_hw_stats *hw_stats = tp->hw_stats;

	if (!(tp->phy_flags & TG3_PHYFLG_PHY_SERDES) &&
	    (tg3_asic_rev(tp) == ASIC_REV_5700 ||
	     tg3_asic_rev(tp) == ASIC_REV_5701)) {
		u32 val;

		if (!tg3_readphy(tp, MII_TG3_TEST1, &val)) {
			tg3_writephy(tp, MII_TG3_TEST1,
				     val | MII_TG3_TEST1_CRC_EN);
			tg3_readphy(tp, MII_TG3_RXR_COUNTERS, &val);
		} else
			val = 0;

		tp->phy_crc_errors += val;

		return tp->phy_crc_errors;
	}

	return get_stat64(&hw_stats->rx_fcs_errors);
}

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.