arcmsr_request_irq(struct pci_dev *pdev, struct AdapterControlBlock *acb)
{
	int	i, j, r;
	struct msix_entry entries[ARCMST_NUM_MSIX_VECTORS];

	for (i = 0; i < ARCMST_NUM_MSIX_VECTORS; i++)
		entries[i].entry = i;
	r = pci_enable_msix_range(pdev, entries, 1, ARCMST_NUM_MSIX_VECTORS);
	if (r < 0)
		goto msi_int;
	acb->msix_vector_count = r;
	for (i = 0; i < r; i++) {
		if (request_irq(entries[i].vector,
			arcmsr_do_interrupt, 0, "arcmsr", acb)) {
			pr_warn("arcmsr%d: request_irq =%d failed!\n",
				acb->host->host_no, entries[i].vector);
			for (j = 0 ; j < i ; j++)
				free_irq(entries[j].vector, acb);
			pci_disable_msix(pdev);
			goto msi_int;
		}
		acb->entries[i] = entries[i];
	}
	acb->acb_flags |= ACB_F_MSIX_ENABLED;
	pr_info("arcmsr%d: msi-x enabled\n", acb->host->host_no);
	return SUCCESS;
msi_int:
	if (pci_enable_msi_exact(pdev, 1) < 0)
		goto legacy_int;
	if (request_irq(pdev->irq, arcmsr_do_interrupt,
		IRQF_SHARED, "arcmsr", acb)) {
		pr_warn("arcmsr%d: request_irq =%d failed!\n",
			acb->host->host_no, pdev->irq);
		pci_disable_msi(pdev);
		goto legacy_int;
	}
	acb->acb_flags |= ACB_F_MSI_ENABLED;
	pr_info("arcmsr%d: msi enabled\n", acb->host->host_no);
	return SUCCESS;
legacy_int:
	if (request_irq(pdev->irq, arcmsr_do_interrupt,
		IRQF_SHARED, "arcmsr", acb)) {
		pr_warn("arcmsr%d: request_irq = %d failed!\n",
			acb->host->host_no, pdev->irq);
		return FAILED;
	}
	return SUCCESS;
}

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.