static u16 b43_dmacontroller_base(enum b43_dmatype type, int controller_idx)
{
	static const u16 map64[] = {
		B43_MMIO_DMA64_BASE0,
		B43_MMIO_DMA64_BASE1,
		B43_MMIO_DMA64_BASE2,
		B43_MMIO_DMA64_BASE3,
		B43_MMIO_DMA64_BASE4,
		B43_MMIO_DMA64_BASE5,
	};
	static const u16 map32[] = {
		B43_MMIO_DMA32_BASE0,
		B43_MMIO_DMA32_BASE1,
		B43_MMIO_DMA32_BASE2,
		B43_MMIO_DMA32_BASE3,
		B43_MMIO_DMA32_BASE4,
		B43_MMIO_DMA32_BASE5,
	};

	if (type == B43_DMA_64BIT) {
		B43_WARN_ON(!(controller_idx >= 0 &&
			      controller_idx < ARRAY_SIZE(map64)));
		return map64[controller_idx];
	}
	B43_WARN_ON(!(controller_idx >= 0 &&
		      controller_idx < ARRAY_SIZE(map32)));
	return map32[controller_idx];
}

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.