static int vdi_port_read_buf_process(int port, VDIReadBuf *buf)
{
    VDIPortState *state = &reds->agent_state;
    int res;

    switch (port) {
    case VDP_CLIENT_PORT: {
        res = agent_msg_filter_process_data(&state->read_filter,
                                            buf->data, buf->len);
        switch (res) {
        case AGENT_MSG_FILTER_OK:
            return TRUE;
        case AGENT_MSG_FILTER_DISCARD:
            return FALSE;
        case AGENT_MSG_FILTER_PROTO_ERROR:
            reds_agent_remove();
            return FALSE;
        }
    }
    case VDP_SERVER_PORT:
        return FALSE;
    default:
        spice_warning("invalid port");
        reds_agent_remove();
        return FALSE;
    }
}

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.