static int tg3_alloc_consistent(struct tg3 *tp)
{
	int i;

	tp->hw_stats = dma_alloc_coherent(&tp->pdev->dev,
					  sizeof(struct tg3_hw_stats),
					  &tp->stats_mapping,
					  GFP_KERNEL);
	if (!tp->hw_stats)
		goto err_out;

	memset(tp->hw_stats, 0, sizeof(struct tg3_hw_stats));

	for (i = 0; i < tp->irq_cnt; i++) {
		struct tg3_napi *tnapi = &tp->napi[i];
		struct tg3_hw_status *sblk;

		tnapi->hw_status = dma_alloc_coherent(&tp->pdev->dev,
						      TG3_HW_STATUS_SIZE,
						      &tnapi->status_mapping,
						      GFP_KERNEL);
		if (!tnapi->hw_status)
			goto err_out;

		memset(tnapi->hw_status, 0, TG3_HW_STATUS_SIZE);
		sblk = tnapi->hw_status;

		if (tg3_flag(tp, ENABLE_RSS)) {
			u16 *prodptr = NULL;

			/*
			 * When RSS is enabled, the status block format changes
			 * slightly.  The "rx_jumbo_consumer", "reserved",
			 * and "rx_mini_consumer" members get mapped to the
			 * other three rx return ring producer indexes.
			 */
			switch (i) {
			case 1:
				prodptr = &sblk->idx[0].rx_producer;
				break;
			case 2:
				prodptr = &sblk->rx_jumbo_consumer;
				break;
			case 3:
				prodptr = &sblk->reserved;
				break;
			case 4:
				prodptr = &sblk->rx_mini_consumer;
				break;
			}
			tnapi->rx_rcb_prod_idx = prodptr;
		} else {
			tnapi->rx_rcb_prod_idx = &sblk->idx[0].rx_producer;
		}
	}

	if (tg3_mem_tx_acquire(tp) || tg3_mem_rx_acquire(tp))
		goto err_out;

	return 0;

err_out:
	tg3_free_consistent(tp);
	return -ENOMEM;
}

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.