    void sync_descbuffer_for_cpu(struct b43_dmaring *ring,
				 dma_addr_t addr, size_t len)
{
	B43_WARN_ON(ring->tx);
	dma_sync_single_for_cpu(ring->dev->dev->dma_dev,
				    addr, len, DMA_FROM_DEVICE);
}

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.