static SpiceCharDeviceState *attach_to_red_agent(SpiceCharDeviceInstance *sin)
{
    VDIPortState *state = &reds->agent_state;
    SpiceCharDeviceInterface *sif;
    SpiceCharDeviceCallbacks char_dev_state_cbs;

    if (!state->base) {
        char_dev_state_cbs.read_one_msg_from_device = vdi_port_read_one_msg_from_device;
        char_dev_state_cbs.ref_msg_to_client = vdi_port_ref_msg_to_client;
        char_dev_state_cbs.unref_msg_to_client = vdi_port_unref_msg_to_client;
        char_dev_state_cbs.send_msg_to_client = vdi_port_send_msg_to_client;
        char_dev_state_cbs.send_tokens_to_client = vdi_port_send_tokens_to_client;
        char_dev_state_cbs.remove_client = vdi_port_remove_client;
        char_dev_state_cbs.on_free_self_token = vdi_port_on_free_self_token;

        state->base = spice_char_device_state_create(sin,
                                                     REDS_TOKENS_TO_SEND,
                                                     REDS_NUM_INTERNAL_AGENT_MESSAGES,
                                                     &char_dev_state_cbs,
                                                     NULL);
    } else {
        spice_char_device_state_reset_dev_instance(state->base, sin);
    }

    vdagent = sin;
    reds_update_mouse_mode();

    sif = SPICE_CONTAINEROF(vdagent->base.sif, SpiceCharDeviceInterface, base);
    if (sif->state) {
        sif->state(vdagent, 1);
    }

    if (!reds_main_channel_connected()) {
        return state->base;
    }

    state->read_filter.discard_all = FALSE;
    reds->agent_state.plug_generation++;

    if (reds->agent_state.mig_data) {
        spice_assert(reds->agent_state.plug_generation == 1);
        reds_agent_state_restore(reds->agent_state.mig_data);
        free(reds->agent_state.mig_data);
        reds->agent_state.mig_data = NULL;
    } else if (!red_channel_waits_for_migrate_data(&reds->main_channel->base)) {
        /* we will assoicate the client with the char device, upon reds_on_main_agent_start,
         * in response to MSGC_AGENT_START */
        main_channel_push_agent_connected(reds->main_channel);
    } else {
       spice_debug("waiting for migration data");
        if (!spice_char_device_client_exists(reds->agent_state.base, reds_get_client())) {
            int client_added;

            client_added = spice_char_device_client_add(reds->agent_state.base,
                                                        reds_get_client(),
                                                        TRUE, /* flow control */
                                                        REDS_VDI_PORT_NUM_RECEIVE_BUFFS,
                                                        REDS_AGENT_WINDOW_SIZE,
                                                        ~0,
                                                        TRUE);

            if (!client_added) {
                spice_warning("failed to add client to agent");
                reds_disconnect();
            }

        }
    }
    return state->base;
}

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.