Overflow while setting too high value for otel logrecord key

[mitzkia]

axosyslog version:

(dbld)micek@DESKTOP-0E9OKG3:/install/sbin$ ./syslog-ng -V
axosyslog 4 (4.8.0.217.g17b1fd8)
Config version: 4.2
Installer-Version: 4.8.0.217.g17b1fd8
Revision:
Compile-Date: Aug 26 2024 05:05:23

Reproduction:
Start axosyslog with the following config:

@version: 4.2

options { stats(level(1)); };

source genmsg {
    example-msg-generator(
        num(1)
        template("foobar")
        values("values.int" => int(10000000000))
    );
};

destination dest_true {
        file (
        dest-true.log
        # template('$MSG')
    );
};

log {
    source(genmsg);
    if {
        filterx {
            $olr = otel_logrecord();
            $olr.dropped_attributes_count = ${values.int};
            $MSG = $olr.dropped_attributes_count;
        };
        destination(dest_true);
    };
};

Notice the overflow in the output ( Setting value; name='MESSAGE', value='4294967295'):

[2024-08-30T20:53:02.245120] syslog-ng starting up; version='4.8.0.217.g17b1fd8'
[2024-08-30T20:53:02.245120] Running application hooks; hook='2'
[2024-08-30T20:53:02.245120] Setting value; name='values.int', value='10000000000', type='int', msg='0x555a1b45a450', rcptid='62'
[2024-08-30T20:53:02.245120] Setting value; name='MESSAGE', value='-- Generated message. --', type='string', msg='0x555a1b45a450', rcptid='62'
[2024-08-30T20:53:02.245120] Setting value; name='MESSAGE', value='foobar', type='string', msg='0x555a1b45a450', rcptid='62'
[2024-08-30T20:53:02.245120] Incoming generated message; msg='foobar'
[2024-08-30T20:53:02.245120] >>>>>> Source side message processing begin; location='filterx-otlp_logrecord.conf:6:5', msg='0x555a1b45a450', rcptid='62'
[2024-08-30T20:53:02.245120] Setting value; name='HOST_FROM', value='DESKTOP-0E9OKG3', type='string', msg='0x555a1b45a450', rcptid='62'
[2024-08-30T20:53:02.245120] Setting value; name='HOST', value='DESKTOP-0E9OKG3', type='string', msg='0x555a1b45a450', rcptid='62'
[2024-08-30T20:53:02.245120] Setting tag; name='.source.genmsg', value='1', msg='0x555a1b45a450'
[2024-08-30T20:53:02.245120] Setting value; name='SOURCE', value='genmsg', type='string', msg='0x555a1b45a450', rcptid='62'
[2024-08-30T20:53:02.245120] >>>>>> filterx rule evaluation begin; rule='#anon-filter0', location='filterx-otlp_logrecord.conf:23:16', msg='0x555a1b45a450', rcptid='62'
[2024-08-30T20:53:02.245120] FILTERX ESTEP; expr='filterx-otlp_logrecord.conf:24:13|    $olr = otel_logrecord()', value='', truthy='1', type='otel_logrecord'
[2024-08-30T20:53:02.245120] FILTERX ESTEP; expr='filterx-otlp_logrecord.conf:25:13|    $olr.dropped_attributes_count = ${values.int}', value='10000000000', truthy='1', type='message_value'
[2024-08-30T20:53:02.245120] FILTERX ESTEP; expr='filterx-otlp_logrecord.conf:26:13|    $MSG = $olr.dropped_attributes_count', value='4294967295', truthy='1', type='integer'
[2024-08-30T20:53:02.245120] <<<<<< filterx rule evaluation result; result='matched', rule='#anon-filter0', location='filterx-otlp_logrecord.conf:23:16', dirty='1', msg='0x555a1b45a450', rcptid='62'
[2024-08-30T20:53:02.245120] Message was cloned; original_msg='0x555a1b45a450', msg='0x555a1b4219c0', rcptid='62'
[2024-08-30T20:53:02.245120] Filterx sync: changed variable in scope, overwriting in message; variable='MESSAGE'
[2024-08-30T20:53:02.245120] Setting value; name='MESSAGE', value='4294967295', type='int', msg='0x555a1b4219c0', rcptid='62'
[2024-08-30T20:53:02.245120] Filterx sync: changed variable in scope, overwriting in message; variable='olr'
[2024-08-30T20:53:02.245120] Setting value; name='olr', value='8����\x0f', type='protobuf', msg='0x555a1b4219c0', rcptid='62'
[2024-08-30T20:53:02.245120] Filterx sync: variable in scope and message in sync, not doing anything; variable='values.int'
[2024-08-30T20:53:02.245120] Initializing destination file writer; template='dest-true.log', filename='dest-true.log', symlink_as='(null)'
[2024-08-30T20:53:02.245120] affile_open_file; path='dest-true.log', fd='14'
[2024-08-30T20:53:02.245120] <<<<<< Source side message processing finish; location='filterx-otlp_logrecord.conf:6:5', msg='0x555a1b45a450', rcptid='62'
[2024-08-30T20:53:02.288473] Outgoing message; message='Aug 30 20:53:02 DESKTOP-0E9OKG3 4294967295\x0a'
[2024-08-30T20:53:02.288473] Window size adjustment; old_window_size='99', window_size_increment='1', suspended_before_increment='FALSE', last_ack_type_is_suspended='FALSE'
^C[2024-08-30T20:53:04.442842] Running application hooks; hook='3'
[2024-08-30T20:53:04.442842] syslog-ng shutting down; version='4.8.0.217.g17b1fd8'
[2024-08-30T20:53:04.543370] stats-aggregator-cps; name='dest_true#0_eps_last_1h', sum='1', divisor='2', cps='0', delta_time_since_start='2'
[2024-08-30T20:53:04.543370] stats-aggregator-cps; name='dest_true#0_eps_last_24h', sum='1', divisor='2', cps='0', delta_time_since_start='2'
[2024-08-30T20:53:04.543370] stats-aggregator-cps; name='dest_true#0_eps_since_start', sum='1', divisor='2', cps='0', delta_time_since_start='2'
[2024-08-30T20:53:04.543370] Closing log transport fd; fd='14'
[2024-08-30T20:53:04.545063] Running application hooks; hook='4'

[mitzkia]

I can extend Light testcases with the validation of this issue.

[mitzkia]

Other fields can be also affected.
For example:

[2024-08-30T21:22:13.783814] FILTERX ESTEP; expr='filterx-otlp_logrecord.conf:27:13|    $olr = otel_logrecord()', value='', truthy='1', type='otel_logrecord'
[2024-08-30T21:22:13.783814] FILTERX ESTEP; expr='filterx-otlp_logrecord.conf:28:13|    $olr.body = ${values.double}', value='3.2e+22', truthy='0', type='message_value'
[2024-08-30T21:22:13.783814] FILTERX ESTEP; expr='filterx-otlp_logrecord.conf:29:13|    $MSG = $olr.body', value='3.2e+22', truthy='1', type='double'
[2024-08-30T21:22:13.783814] <<<<<< filterx rule evaluation result; result='matched', rule='#anon-filter0', location='filterx-otlp_logrecord.conf:26:16', dirty='1', msg='0x55dccab2d8a0', rcptid='68'
[2024-08-30T21:22:13.783814] Message was cloned; original_msg='0x55dccab2d8a0', msg='0x55dccaaf49c0', rcptid='68'
[2024-08-30T21:22:13.783814] Filterx sync: changed variable in scope, overwriting in message; variable='MESSAGE'
[2024-08-30T21:22:13.783814] Setting value; name='MESSAGE', value='3.2e+22', type='double', msg='0x55dccaaf49c0', rcptid='68'
[2024-08-30T21:22:13.783814] Filterx sync: changed variable in scope, overwriting in message; variable='olr'
[2024-08-30T21:22:13.783814] Setting value; name='olr', value='*        !P����\x1a�D', type='protobuf', msg='0x55dccaaf49c0', rcptid='68'