static int tg3_rx_prodring_alloc(struct tg3 *tp,
				 struct tg3_rx_prodring_set *tpr)
{
	u32 i, rx_pkt_dma_sz;

	tpr->rx_std_cons_idx = 0;
	tpr->rx_std_prod_idx = 0;
	tpr->rx_jmb_cons_idx = 0;
	tpr->rx_jmb_prod_idx = 0;

	if (tpr != &tp->napi[0].prodring) {
		memset(&tpr->rx_std_buffers[0], 0,
		       TG3_RX_STD_BUFF_RING_SIZE(tp));
		if (tpr->rx_jmb_buffers)
			memset(&tpr->rx_jmb_buffers[0], 0,
			       TG3_RX_JMB_BUFF_RING_SIZE(tp));
		goto done;
	}

	/* Zero out all descriptors. */
	memset(tpr->rx_std, 0, TG3_RX_STD_RING_BYTES(tp));

	rx_pkt_dma_sz = TG3_RX_STD_DMA_SZ;
	if (tg3_flag(tp, 5780_CLASS) &&
	    tp->dev->mtu > ETH_DATA_LEN)
		rx_pkt_dma_sz = TG3_RX_JMB_DMA_SZ;
	tp->rx_pkt_map_sz = TG3_RX_DMA_TO_MAP_SZ(rx_pkt_dma_sz);

	/* Initialize invariants of the rings, we only set this
	 * stuff once.  This works because the card does not
	 * write into the rx buffer posting rings.
	 */
	for (i = 0; i <= tp->rx_std_ring_mask; i++) {
		struct tg3_rx_buffer_desc *rxd;

		rxd = &tpr->rx_std[i];
		rxd->idx_len = rx_pkt_dma_sz << RXD_LEN_SHIFT;
		rxd->type_flags = (RXD_FLAG_END << RXD_FLAGS_SHIFT);
		rxd->opaque = (RXD_OPAQUE_RING_STD |
			       (i << RXD_OPAQUE_INDEX_SHIFT));
	}

	/* Now allocate fresh SKBs for each rx ring. */
	for (i = 0; i < tp->rx_pending; i++) {
		unsigned int frag_size;

		if (tg3_alloc_rx_data(tp, tpr, RXD_OPAQUE_RING_STD, i,
				      &frag_size) < 0) {
			netdev_warn(tp->dev,
				    "Using a smaller RX standard ring. Only "
				    "%d out of %d buffers were allocated "
				    "successfully\n", i, tp->rx_pending);
			if (i == 0)
				goto initfail;
			tp->rx_pending = i;
			break;
		}
	}

	if (!tg3_flag(tp, JUMBO_CAPABLE) || tg3_flag(tp, 5780_CLASS))
		goto done;

	memset(tpr->rx_jmb, 0, TG3_RX_JMB_RING_BYTES(tp));

	if (!tg3_flag(tp, JUMBO_RING_ENABLE))
		goto done;

	for (i = 0; i <= tp->rx_jmb_ring_mask; i++) {
		struct tg3_rx_buffer_desc *rxd;

		rxd = &tpr->rx_jmb[i].std;
		rxd->idx_len = TG3_RX_JMB_DMA_SZ << RXD_LEN_SHIFT;
		rxd->type_flags = (RXD_FLAG_END << RXD_FLAGS_SHIFT) |
				  RXD_FLAG_JUMBO;
		rxd->opaque = (RXD_OPAQUE_RING_JUMBO |
		       (i << RXD_OPAQUE_INDEX_SHIFT));
	}

	for (i = 0; i < tp->rx_jumbo_pending; i++) {
		unsigned int frag_size;

		if (tg3_alloc_rx_data(tp, tpr, RXD_OPAQUE_RING_JUMBO, i,
				      &frag_size) < 0) {
			netdev_warn(tp->dev,
				    "Using a smaller RX jumbo ring. Only %d "
				    "out of %d buffers were allocated "
				    "successfully\n", i, tp->rx_jumbo_pending);
			if (i == 0)
				goto initfail;
			tp->rx_jumbo_pending = i;
			break;
		}
	}

done:
	return 0;

initfail:
	tg3_rx_prodring_free(tp, tpr);
	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.