static int setup_rx_descbuffer(struct b43_dmaring *ring,
			       struct b43_dmadesc_generic *desc,
			       struct b43_dmadesc_meta *meta, gfp_t gfp_flags)
{
	dma_addr_t dmaaddr;
	struct sk_buff *skb;

	B43_WARN_ON(ring->tx);

	skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags);
	if (unlikely(!skb))
		return -ENOMEM;
	b43_poison_rx_buffer(ring, skb);
	dmaaddr = map_descbuffer(ring, skb->data, ring->rx_buffersize, 0);
	if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) {
		/* ugh. try to realloc in zone_dma */
		gfp_flags |= GFP_DMA;

		dev_kfree_skb_any(skb);

		skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags);
		if (unlikely(!skb))
			return -ENOMEM;
		b43_poison_rx_buffer(ring, skb);
		dmaaddr = map_descbuffer(ring, skb->data,
					 ring->rx_buffersize, 0);
		if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) {
			b43err(ring->dev->wl, "RX DMA buffer allocation failed\n");
			dev_kfree_skb_any(skb);
			return -EIO;
		}
	}

	meta->skb = skb;
	meta->dmaaddr = dmaaddr;
	ring->ops->fill_descriptor(ring, desc, dmaaddr,
				   ring->rx_buffersize, 0, 0, 0);

	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.