static int __kvm_io_bus_read(struct kvm_io_bus *bus, struct kvm_io_range *range,
			     void *val)
{
	int idx;

	idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
	if (idx < 0)
		return -EOPNOTSUPP;

	while (idx < bus->dev_count &&
		kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
		if (!kvm_iodevice_read(bus->range[idx].dev, range->addr,
				       range->len, val))
			return idx;
		idx++;
	}

	return -EOPNOTSUPP;
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.