static void ne2000_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);

    k->realize = pci_ne2000_realize;
    k->exit = pci_ne2000_exit;
    k->romfile = "efi-ne2k_pci.rom",
    k->vendor_id = PCI_VENDOR_ID_REALTEK;
    k->device_id = PCI_DEVICE_ID_REALTEK_8029;
    k->class_id = PCI_CLASS_NETWORK_ETHERNET;
    dc->vmsd = &vmstate_pci_ne2000;
    dc->props = ne2000_properties;
    set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
}

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.