static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	struct vfio_pci_device *vdev;
	struct iommu_group *group;
	int ret;

	if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL)
		return -EINVAL;

	group = vfio_iommu_group_get(&pdev->dev);
	if (!group)
		return -EINVAL;

	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
	if (!vdev) {
		vfio_iommu_group_put(group, &pdev->dev);
		return -ENOMEM;
	}

	vdev->pdev = pdev;
	vdev->irq_type = VFIO_PCI_NUM_IRQS;
	mutex_init(&vdev->igate);
	spin_lock_init(&vdev->irqlock);

	ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev);
	if (ret) {
		vfio_iommu_group_put(group, &pdev->dev);
		kfree(vdev);
		return ret;
	}

	if (vfio_pci_is_vga(pdev)) {
		vga_client_register(pdev, vdev, NULL, vfio_pci_set_vga_decode);
		vga_set_legacy_decoding(pdev,
					vfio_pci_set_vga_decode(vdev, false));
	}

	if (!disable_idle_d3) {
		/*
		 * pci-core sets the device power state to an unknown value at
		 * bootup and after being removed from a driver.  The only
		 * transition it allows from this unknown state is to D0, which
		 * typically happens when a driver calls pci_enable_device().
		 * We're not ready to enable the device yet, but we do want to
		 * be able to get to D3.  Therefore first do a D0 transition
		 * before going to D3.
		 */
		pci_set_power_state(pdev, PCI_D0);
		pci_set_power_state(pdev, PCI_D3hot);
	}

	return ret;
}

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.