static int region_type_cap(struct vfio_pci_device *vdev,
			   struct vfio_info_cap *caps,
			   unsigned int type, unsigned int subtype)
{
	struct vfio_info_cap_header *header;
	struct vfio_region_info_cap_type *cap;

	header = vfio_info_cap_add(caps, sizeof(*cap),
				   VFIO_REGION_INFO_CAP_TYPE, 1);
	if (IS_ERR(header))
		return PTR_ERR(header);

	cap = container_of(header, struct vfio_region_info_cap_type, header);
	cap->type = type;
	cap->subtype = subtype;

	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.