static bool arcmsr_hbaA_get_config(struct AdapterControlBlock *acb)
{
	struct MessageUnit_A __iomem *reg = acb->pmuA;
	char *acb_firm_model = acb->firm_model;
	char *acb_firm_version = acb->firm_version;
	char *acb_device_map = acb->device_map;
	char __iomem *iop_firm_model = (char __iomem *)(&reg->message_rwbuffer[15]);
	char __iomem *iop_firm_version = (char __iomem *)(&reg->message_rwbuffer[17]);
	char __iomem *iop_device_map = (char __iomem *)(&reg->message_rwbuffer[21]);
	int count;
	writel(ARCMSR_INBOUND_MESG0_GET_CONFIG, &reg->inbound_msgaddr0);
	if (!arcmsr_hbaA_wait_msgint_ready(acb)) {
		printk(KERN_NOTICE "arcmsr%d: wait 'get adapter firmware \
			miscellaneous data' timeout \n", acb->host->host_no);
		return false;
	}
	count = 8;
	while (count){
		*acb_firm_model = readb(iop_firm_model);
		acb_firm_model++;
		iop_firm_model++;
		count--;
	}

	count = 16;
	while (count){
		*acb_firm_version = readb(iop_firm_version);
		acb_firm_version++;
		iop_firm_version++;
		count--;
	}

	count=16;
	while(count){
		*acb_device_map = readb(iop_device_map);
		acb_device_map++;
		iop_device_map++;
		count--;
	}
	pr_notice("Areca RAID Controller%d: Model %s, F/W %s\n",
		acb->host->host_no,
		acb->firm_model,
		acb->firm_version);
	acb->signature = readl(&reg->message_rwbuffer[0]);
	acb->firm_request_len = readl(&reg->message_rwbuffer[1]);
	acb->firm_numbers_queue = readl(&reg->message_rwbuffer[2]);
	acb->firm_sdram_size = readl(&reg->message_rwbuffer[3]);
	acb->firm_hd_channels = readl(&reg->message_rwbuffer[4]);
	acb->firm_cfg_version = readl(&reg->message_rwbuffer[25]);  /*firm_cfg_version,25,100-103*/
	return true;
}

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.