int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
			      struct kvm_io_device *dev)
{
	int i, r;
	struct kvm_io_bus *new_bus, *bus;

	bus = kvm->buses[bus_idx];
	r = -ENOENT;
	for (i = 0; i < bus->dev_count; i++)
		if (bus->range[i].dev == dev) {
			r = 0;
			break;
		}

	if (r)
		return r;

	new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) *
			  sizeof(struct kvm_io_range)), GFP_KERNEL);
	if (!new_bus)
		return -ENOMEM;

	memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
	new_bus->dev_count--;
	memcpy(new_bus->range + i, bus->range + i + 1,
	       (new_bus->dev_count - i) * sizeof(struct kvm_io_range));

	rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
	synchronize_srcu_expedited(&kvm->srcu);
	kfree(bus);
	return r;
}

This vulnerability category highlights issues in resource management where failures to properly release memory, file handles, or other resources can degrade system performance or enable denial-of-service conditions.