static void arcmsr_hbaA_postqueue_isr(struct AdapterControlBlock *acb)
{
	uint32_t flag_ccb;
	struct MessageUnit_A __iomem *reg = acb->pmuA;
	struct ARCMSR_CDB *pARCMSR_CDB;
	struct CommandControlBlock *pCCB;
	bool error;
	while ((flag_ccb = readl(&reg->outbound_queueport)) != 0xFFFFFFFF) {
		pARCMSR_CDB = (struct ARCMSR_CDB *)(acb->vir2phy_offset + (flag_ccb << 5));/*frame must be 32 bytes aligned*/
		pCCB = container_of(pARCMSR_CDB, struct CommandControlBlock, arcmsr_cdb);
		error = (flag_ccb & ARCMSR_CCBREPLY_FLAG_ERROR_MODE0) ? true : false;
		arcmsr_drain_donequeue(acb, pCCB, error);
	}
}

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.