void b43_dma_direct_fifo_rx(struct b43_wldev *dev,
			    unsigned int engine_index, bool enable)
{
	enum b43_dmatype type;
	u16 mmio_base;

	type = dma_mask_to_engine_type(supported_dma_mask(dev));

	mmio_base = b43_dmacontroller_base(type, engine_index);
	direct_fifo_rx(dev, type, mmio_base, enable);
}

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.