static int arcmsr_hbaA_polling_ccbdone(struct AdapterControlBlock *acb,
	struct CommandControlBlock *poll_ccb)
{
	struct MessageUnit_A __iomem *reg = acb->pmuA;
	struct CommandControlBlock *ccb;
	struct ARCMSR_CDB *arcmsr_cdb;
	uint32_t flag_ccb, outbound_intstatus, poll_ccb_done = 0, poll_count = 0;
	int rtn;
	bool error;
	polling_hba_ccb_retry:
	poll_count++;
	outbound_intstatus = readl(&reg->outbound_intstatus) & acb->outbound_int_enable;
	writel(outbound_intstatus, &reg->outbound_intstatus);/*clear interrupt*/
	while (1) {
		if ((flag_ccb = readl(&reg->outbound_queueport)) == 0xFFFFFFFF) {
			if (poll_ccb_done){
				rtn = SUCCESS;
				break;
			}else {
				msleep(25);
				if (poll_count > 100){
					rtn = FAILED;
					break;
				}
				goto polling_hba_ccb_retry;
			}
		}
		arcmsr_cdb = (struct ARCMSR_CDB *)(acb->vir2phy_offset + (flag_ccb << 5));
		ccb = container_of(arcmsr_cdb, struct CommandControlBlock, arcmsr_cdb);
		poll_ccb_done |= (ccb == poll_ccb) ? 1 : 0;
		if ((ccb->acb != acb) || (ccb->startdone != ARCMSR_CCB_START)) {
			if ((ccb->startdone == ARCMSR_CCB_ABORTED) || (ccb == poll_ccb)) {
				printk(KERN_NOTICE "arcmsr%d: scsi id = %d lun = %d ccb = '0x%p'"
					" poll command abort successfully \n"
					, acb->host->host_no
					, ccb->pcmd->device->id
					, (u32)ccb->pcmd->device->lun
					, ccb);
				ccb->pcmd->result = DID_ABORT << 16;
				arcmsr_ccb_complete(ccb);
				continue;
			}
			printk(KERN_NOTICE "arcmsr%d: polling get an illegal ccb"
				" command done ccb = '0x%p'"
				"ccboutstandingcount = %d \n"
				, acb->host->host_no
				, ccb
				, atomic_read(&acb->ccboutstandingcount));
			continue;
		}
		error = (flag_ccb & ARCMSR_CCBREPLY_FLAG_ERROR_MODE0) ? true : false;
		arcmsr_report_ccb_state(acb, ccb, error);
	}
	return rtn;
}

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.