static bool arcmsr_hbaD_get_config(struct AdapterControlBlock *acb)
{
	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 *iop_firm_version;
	char __iomem *iop_device_map;
	u32 count;
	struct MessageUnit_D *reg = acb->pmuD;

	iop_firm_model = (char __iomem *)(&reg->msgcode_rwbuffer[15]);
	iop_firm_version = (char __iomem *)(&reg->msgcode_rwbuffer[17]);
	iop_device_map = (char __iomem *)(&reg->msgcode_rwbuffer[21]);
	if (readl(acb->pmuD->outbound_doorbell) &
		ARCMSR_ARC1214_IOP2DRV_MESSAGE_CMD_DONE) {
		writel(ARCMSR_ARC1214_IOP2DRV_MESSAGE_CMD_DONE,
			acb->pmuD->outbound_doorbell);/*clear interrupt*/
	}
	/* post "get config" instruction */
	writel(ARCMSR_INBOUND_MESG0_GET_CONFIG, reg->inbound_msgaddr0);
	/* wait message ready */
	if (!arcmsr_hbaD_wait_msgint_ready(acb)) {
		pr_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--;
	}
	acb->signature = readl(&reg->msgcode_rwbuffer[0]);
	/*firm_signature,1,00-03*/
	acb->firm_request_len = readl(&reg->msgcode_rwbuffer[1]);
	/*firm_request_len,1,04-07*/
	acb->firm_numbers_queue = readl(&reg->msgcode_rwbuffer[2]);
	/*firm_numbers_queue,2,08-11*/
	acb->firm_sdram_size = readl(&reg->msgcode_rwbuffer[3]);
	/*firm_sdram_size,3,12-15*/
	acb->firm_hd_channels = readl(&reg->msgcode_rwbuffer[4]);
	/*firm_hd_channels,4,16-19*/
	acb->firm_cfg_version = readl(&reg->msgcode_rwbuffer[25]);
	pr_notice("Areca RAID Controller%d: Model %s, F/W %s\n",
		acb->host->host_no,
		acb->firm_model,
		acb->firm_version);
	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.