static int mongo_cursor_get_more( mongo_cursor *cursor ) {
    int res;

    if( cursor->limit > 0 && cursor->seen >= cursor->limit ) {
        cursor->err = MONGO_CURSOR_EXHAUSTED;
        return MONGO_ERROR;
    }
    else if( ! cursor->reply ) {
        cursor->err = MONGO_CURSOR_INVALID;
        return MONGO_ERROR;
    }
    else if( ! cursor->reply->fields.cursorID ) {
        cursor->err = MONGO_CURSOR_EXHAUSTED;
        return MONGO_ERROR;
    }
    else {
        char *data;
        int sl = strlen( cursor->ns )+1;
        int limit = 0;
        mongo_message *mm;

        if( cursor->limit > 0 )
            limit = cursor->limit - cursor->seen;

        mm = mongo_message_create( 16 /*header*/
                                   +4 /*ZERO*/
                                   +sl
                                   +4 /*numToReturn*/
                                   +8 /*cursorID*/
                                   , 0, 0, MONGO_OP_GET_MORE );
        data = &mm->data;
        data = mongo_data_append32( data, &ZERO );
        data = mongo_data_append( data, cursor->ns, sl );
        data = mongo_data_append32( data, &limit );
        mongo_data_append64( data, &cursor->reply->fields.cursorID );

        bson_free( cursor->reply );
        res = mongo_message_send( cursor->conn, mm );
        if( res != MONGO_OK ) {
            mongo_cursor_destroy( cursor );
            return MONGO_ERROR;
        }

        res = mongo_read_response( cursor->conn, &( cursor->reply ) );
        if( res != MONGO_OK ) {
            mongo_cursor_destroy( cursor );
            return MONGO_ERROR;
        }
        cursor->current.data = NULL;
        cursor->seen += cursor->reply->fields.num;

        return MONGO_OK;
    }
}
The software performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control.