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[Backport 2.x] Single line comments can end in newline or EOF. Fixes #11815 #11834

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Jan 10, 2024
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[Backport 2.x] Single line comments can end in newline or EOF. Fixes #11815 #11834

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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -127,6 +127,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
- Fix Automatic addition of protocol broken in #11512 ([#11609](https://github.com/opensearch-project/OpenSearch/pull/11609))
- Fix issue when calling Delete PIT endpoint and no PITs exist ([#11711](https://github.com/opensearch-project/OpenSearch/pull/11711))
- Fix tracing context propagation for local transport instrumentation ([#11490](https://github.com/opensearch-project/OpenSearch/pull/11490))
- Fix parsing of single line comments in `lang-painless` ([#11815](https://github.com/opensearch-project/OpenSearch/issues/11815))

### Security

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2 changes: 1 addition & 1 deletion modules/lang-painless/src/main/antlr/PainlessLexer.g4
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Expand Up @@ -25,7 +25,7 @@ protected abstract boolean isSlashRegex();
}

WS: [ \t\n\r]+ -> skip;
COMMENT: ( '//' .*? [\n\r] | '/*' .*? '*/' ) -> skip;
COMMENT: ( '//' ~[\n\r]* | '/*' .*? '*/' ) -> skip;

LBRACK: '{';
RBRACK: '}';
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