static void arcmsr_hbaD_postqueue_isr(struct AdapterControlBlock *acb)
{
	u32 outbound_write_pointer, doneq_index, index_stripped, toggle;
	uint32_t addressLow, ccb_cdb_phy;
	int error;
	struct MessageUnit_D  *pmu;
	struct ARCMSR_CDB *arcmsr_cdb;
	struct CommandControlBlock *ccb;
	unsigned long flags;

	spin_lock_irqsave(&acb->doneq_lock, flags);
	pmu = acb->pmuD;
	outbound_write_pointer = pmu->done_qbuffer[0].addressLow + 1;
	doneq_index = pmu->doneq_index;
	if ((doneq_index & 0xFFF) != (outbound_write_pointer & 0xFFF)) {
		do {
			toggle = doneq_index & 0x4000;
			index_stripped = (doneq_index & 0xFFF) + 1;
			index_stripped %= ARCMSR_MAX_ARC1214_DONEQUEUE;
			pmu->doneq_index = index_stripped ? (index_stripped | toggle) :
				((toggle ^ 0x4000) + 1);
			doneq_index = pmu->doneq_index;
			addressLow = pmu->done_qbuffer[doneq_index &
				0xFFF].addressLow;
			ccb_cdb_phy = (addressLow & 0xFFFFFFF0);
			arcmsr_cdb = (struct ARCMSR_CDB *)(acb->vir2phy_offset
				+ ccb_cdb_phy);
			ccb = container_of(arcmsr_cdb,
				struct CommandControlBlock, arcmsr_cdb);
			error = (addressLow & ARCMSR_CCBREPLY_FLAG_ERROR_MODE1)
				? true : false;
			arcmsr_drain_donequeue(acb, ccb, error);
			writel(doneq_index, pmu->outboundlist_read_pointer);
		} while ((doneq_index & 0xFFF) !=
			(outbound_write_pointer & 0xFFF));
	}
	writel(ARCMSR_ARC1214_OUTBOUND_LIST_INTERRUPT_CLEAR,
		pmu->outboundlist_interrupt_cause);
	readl(pmu->outboundlist_interrupt_cause);
	spin_unlock_irqrestore(&acb->doneq_lock, flags);
}

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.