[v15] fix: support set.add on nil sets in traits expression parser

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The easiest, and most secure way to access and protect all of your infrastructure.

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[v15] fix: support set.add on nil sets in traits expression parser #49432

Closed nklaassen closed 3 days ago

nklaassen commented 4 days ago

Backport #49385 to branch/v15

This is a manual backport and a much smaller and more targeted change than the original PR, because in this branch lib/expression.Set has not been converted to use lib/utils.Set.

Changelog: Fixed a potential panic in login rule and SAML IdP expression parser

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