arcmsr_Read_iop_rqbuffer_data(struct AdapterControlBlock *acb,
	struct QBUFFER __iomem *prbuffer) {

	uint8_t *pQbuffer;
	uint8_t __iomem *iop_data;
	uint32_t iop_len;

	if (acb->adapter_type & (ACB_ADAPTER_TYPE_C | ACB_ADAPTER_TYPE_D))
		return arcmsr_Read_iop_rqbuffer_in_DWORD(acb, prbuffer);
	iop_data = (uint8_t __iomem *)prbuffer->data;
	iop_len = readl(&prbuffer->data_len);
	while (iop_len > 0) {
		pQbuffer = &acb->rqbuffer[acb->rqbuf_putIndex];
		*pQbuffer = readb(iop_data);
		acb->rqbuf_putIndex++;
		acb->rqbuf_putIndex %= ARCMSR_MAX_QBUFFER;
		iop_data++;
		iop_len--;
	}
	arcmsr_iop_message_read(acb);
	return 1;
}

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.