static void arcmsr_hbaA_start_bgrb(struct AdapterControlBlock *acb)
{
	struct MessageUnit_A __iomem *reg = acb->pmuA;
	acb->acb_flags |= ACB_F_MSG_START_BGRB;
	writel(ARCMSR_INBOUND_MESG0_START_BGRB, &reg->inbound_msgaddr0);
	if (!arcmsr_hbaA_wait_msgint_ready(acb)) {
		printk(KERN_NOTICE "arcmsr%d: wait 'start adapter background \
				rebulid' timeout \n", acb->host->host_no);
	}
}

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.