static int alloc_initial_descbuffers(struct b43_dmaring *ring)
{
	int i, err = -ENOMEM;
	struct b43_dmadesc_generic *desc;
	struct b43_dmadesc_meta *meta;

	for (i = 0; i < ring->nr_slots; i++) {
		desc = ring->ops->idx2desc(ring, i, &meta);

		err = setup_rx_descbuffer(ring, desc, meta, GFP_KERNEL);
		if (err) {
			b43err(ring->dev->wl,
			       "Failed to allocate initial descbuffers\n");
			goto err_unwind;
		}
	}
	mb();
	ring->used_slots = ring->nr_slots;
	err = 0;
      out:
	return err;

      err_unwind:
	for (i--; i >= 0; i--) {
		desc = ring->ops->idx2desc(ring, i, &meta);

		unmap_descbuffer(ring, meta->dmaaddr, ring->rx_buffersize, 0);
		dev_kfree_skb(meta->skb);
	}
	goto out;
}

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.