static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
{
    VirtIONet *n = opaque;
    VirtIODevice *vdev = VIRTIO_DEVICE(n);
    int ret, i, link_down;

    if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
        return -EINVAL;

    ret = virtio_load(vdev, f);
    if (ret) {
        return ret;
    }

    qemu_get_buffer(f, n->mac, ETH_ALEN);
    n->vqs[0].tx_waiting = qemu_get_be32(f);

    virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f));

    if (version_id >= 3)
        n->status = qemu_get_be16(f);

    if (version_id >= 4) {
        if (version_id < 8) {
            n->promisc = qemu_get_be32(f);
            n->allmulti = qemu_get_be32(f);
        } else {
            n->promisc = qemu_get_byte(f);
            n->allmulti = qemu_get_byte(f);
        }
    }

    if (version_id >= 5) {
        n->mac_table.in_use = qemu_get_be32(f);
        /* MAC_TABLE_ENTRIES may be different from the saved image */
         if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
             qemu_get_buffer(f, n->mac_table.macs,
                             n->mac_table.in_use * ETH_ALEN);
        } else {
            int64_t i;

            /* Overflow detected - can happen if source has a larger MAC table.
             * We simply set overflow flag so there's no need to maintain the
             * table of addresses, discard them all.
             * Note: 64 bit math to avoid integer overflow.
             */
            for (i = 0; i < (int64_t)n->mac_table.in_use * ETH_ALEN; ++i) {
                qemu_get_byte(f);
            }
             n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
             n->mac_table.in_use = 0;
         }
            error_report("virtio-net: saved image requires vnet_hdr=on");
            return -1;
        }
    }

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.