static void ne2000_write(void *opaque, hwaddr addr,
                         uint64_t data, unsigned size)
{
    NE2000State *s = opaque;

    if (addr < 0x10 && size == 1) {
        ne2000_ioport_write(s, addr, data);
    } else if (addr == 0x10) {
        if (size <= 2) {
            ne2000_asic_ioport_write(s, addr, data);
        } else {
            ne2000_asic_ioport_writel(s, addr, data);
        }
    } else if (addr == 0x1f && size == 1) {
        ne2000_reset_ioport_write(s, addr, data);
    }
}

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.