void ne2000_reset(NE2000State *s)
{
    int i;

    s->isr = ENISR_RESET;
    memcpy(s->mem, &s->c.macaddr, 6);
    s->mem[14] = 0x57;
    s->mem[15] = 0x57;

    /* duplicate prom data */
    for(i = 15;i >= 0; i--) {
        s->mem[2 * i] = s->mem[i];
        s->mem[2 * i + 1] = s->mem[i];
    }
}

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.