static int stellaris_enet_init(SysBusDevice *sbd)
{
    DeviceState *dev = DEVICE(sbd);
    stellaris_enet_state *s = STELLARIS_ENET(dev);

    memory_region_init_io(&s->mmio, OBJECT(s), &stellaris_enet_ops, s,
                          "stellaris_enet", 0x1000);
    sysbus_init_mmio(sbd, &s->mmio);
    sysbus_init_irq(sbd, &s->irq);
    qemu_macaddr_default_if_unset(&s->conf.macaddr);

    s->nic = qemu_new_nic(&net_stellaris_enet_info, &s->conf,
                          object_get_typename(OBJECT(dev)), dev->id, s);
    qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);

    stellaris_enet_reset(s);
    register_savevm(dev, "stellaris_enet", -1, 1,
                    stellaris_enet_save, stellaris_enet_load, s);
    return 0;
}
The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.