static int tg3_poll_work(struct tg3_napi *tnapi, int work_done, int budget)
{
	struct tg3 *tp = tnapi->tp;

	/* run TX completion thread */
	if (tnapi->hw_status->idx[0].tx_consumer != tnapi->tx_cons) {
		tg3_tx(tnapi);
		if (unlikely(tg3_flag(tp, TX_RECOVERY_PENDING)))
			return work_done;
	}

	if (!tnapi->rx_rcb_prod_idx)
		return work_done;

	/* run RX thread, within the bounds set by NAPI.
	 * All RX "locking" is done by ensuring outside
	 * code synchronizes with tg3->napi.poll()
	 */
	if (*(tnapi->rx_rcb_prod_idx) != tnapi->rx_rcb_ptr)
		work_done += tg3_rx(tnapi, budget - work_done);

	if (tg3_flag(tp, ENABLE_RSS) && tnapi == &tp->napi[1]) {
		struct tg3_rx_prodring_set *dpr = &tp->napi[0].prodring;
		int i, err = 0;
		u32 std_prod_idx = dpr->rx_std_prod_idx;
		u32 jmb_prod_idx = dpr->rx_jmb_prod_idx;

		tp->rx_refill = false;
		for (i = 1; i <= tp->rxq_cnt; i++)
			err |= tg3_rx_prodring_xfer(tp, dpr,
						    &tp->napi[i].prodring);

		wmb();

		if (std_prod_idx != dpr->rx_std_prod_idx)
			tw32_rx_mbox(TG3_RX_STD_PROD_IDX_REG,
				     dpr->rx_std_prod_idx);

		if (jmb_prod_idx != dpr->rx_jmb_prod_idx)
			tw32_rx_mbox(TG3_RX_JMB_PROD_IDX_REG,
				     dpr->rx_jmb_prod_idx);

		mmiowb();

		if (err)
			tw32_f(HOSTCC_MODE, tp->coal_now);
	}

	return work_done;
}

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.