static int vfio_intx_enable(struct vfio_pci_device *vdev)
{
	if (!is_irq_none(vdev))
		return -EINVAL;

	if (!vdev->pdev->irq)
		return -ENODEV;

	vdev->ctx = kzalloc(sizeof(struct vfio_pci_irq_ctx), GFP_KERNEL);
	if (!vdev->ctx)
		return -ENOMEM;

	vdev->num_ctx = 1;

	/*
	 * If the virtual interrupt is masked, restore it.  Devices
	 * supporting DisINTx can be masked at the hardware level
	 * here, non-PCI-2.3 devices will have to wait until the
	 * interrupt is enabled.
	 */
	vdev->ctx[0].masked = vdev->virq_disabled;
	if (vdev->pci_2_3)
		pci_intx(vdev->pdev, !vdev->ctx[0].masked);

	vdev->irq_type = VFIO_PCI_INTX_IRQ_INDEX;

	return 0;
}

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.