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JavaScript: preserve sanitizer barriers on guarded phi inputs - #23005
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nikhilred2619 wants to merge 1 commit into
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Fixes #22848.
This change fixes false positives caused by sanitizer guards being lost across SSA phi inputs.
The fix preserves branch-specific barriers while keeping direct flow edges for inputs without a dominating condition.
I also added regression tests covering safe fallbacks, guarded loops, incorrect guard conditions, reflected XSS, and resource exhaustion. The existing spurious alert in
UnsafeShellCommandConstructionis removed.Testing: All 21 affected tests passed locally.
Related PR: #22873 addresses the same underlying issue. This version additionally limits synthetic phi-input nodes to guarded predecessor blocks and includes broader regression coverage.
Happy to make any adjustments based on feedback.