uint8_t *reds_get_agent_data_buffer(MainChannelClient *mcc, size_t size)
{
    VDIPortState *dev_state = &reds->agent_state;
    RedClient *client;

    if (!dev_state->client_agent_started) {
        /*
         * agent got disconnected, and possibly got reconnected, but we still can receive
         * msgs that are addressed to the agent's old instance, in case they were
         * sent by the client before it received the AGENT_DISCONNECTED msg.
         * In such case, we will receive and discard the msgs (reds_reset_vdp takes care
         * of setting state->write_filter.result = AGENT_MSG_FILTER_DISCARD).
         */
        return spice_malloc(size);
    }

    spice_assert(dev_state->recv_from_client_buf == NULL);
    client = main_channel_client_get_base(mcc)->client;
    dev_state->recv_from_client_buf = spice_char_device_write_buffer_get(dev_state->base,
                                                                         client,
                                                                         size + sizeof(VDIChunkHeader));
    dev_state->recv_from_client_buf_pushed = FALSE;
    return dev_state->recv_from_client_buf->buf + sizeof(VDIChunkHeader);
}

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.