fix: prevent panic on invalid regex in reload annotation#1193
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nikolauspschuetz wants to merge 1 commit into
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fix: prevent panic on invalid regex in reload annotation#1193nikolauspschuetz wants to merge 1 commit into
nikolauspschuetz wants to merge 1 commit into
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ShouldReload compiled each comma-separated value of a named reload annotation (e.g. secret.reloader.stakater.com/reload) with regexp.MustCompile, which panics on an invalid pattern. The value comes straight from a user-set annotation on a watched workload, and the queue worker has no recover(), so a single malformed annotation (e.g. "app-config[") on any workload in any watched namespace crashes Reloader and stops reloads cluster-wide. Use regexp.Compile and, on error, log and skip that pattern instead of panicking.
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nikolauspschuetz
marked this pull request as ready for review
July 22, 2026 21:40
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Problem
ShouldReloadcompiles each comma-separated value of a named reload annotation withregexp.MustCompile:The value comes directly from a user-set annotation on a watched workload (e.g.
secret.reloader.stakater.com/reload/configmap.reloader.stakater.com/reload, which support regex).regexp.MustCompilepanics on an invalid pattern, and the queue worker (wait.Until(c.runWorker, …)) has norecover(). So a single malformed annotation on any workload in any watched namespace — e.g.:crashes the Reloader process and stops reloads cluster-wide — a low-privilege, cross-namespace availability issue.
Fix
Use
regexp.Compileand, on error, log and skip that pattern instead of panicking. Valid patterns behave exactly as before; an invalid one is logged and simply doesn't match.Test
Added
TestShouldReload_InvalidRegexAnnotation_DoesNotPanicinpkg/common/common_test.go. It panics before this change and passes after (verified withgo test ./pkg/common/...).