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Without returning after the error, execution fell through and returned compiler->fn->constants.count - 1, which could emit invalid bytecode.
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Base: upstream wren-lang/wren @ 99d2f0b (fork main), tree previously vendored as a depth-1 clone with .git stripped. Delta (10 files, all in src/vm/): security backports of upstream PRs wren-lang#1242-1246 (OOB/BOF clamps), fixes for wren-lang#1234 (runtimeError upvalue leak), wren-lang#1212 (lazy string hashing), wren-lang#1141 (sort middle pivot), wren-lang#1056 (cyclic-print truncation), wren-lang#676 (createForeign stackTop), wren-lang#1036/wren-lang#1034/ wren-lang#1033 (error-message bounds), wren-lang#811 (unbound foreign ctor), wren-lang#1236 (fiber-stack UAF), wren-lang#1230 (String.find table), wren-lang#1088 (upvalue bound), wren-lang#1102 (Range.contains), wren-lang#1228 (lexer overrun), wren-lang#814 (hex-escape UB), wren-lang#897 (shift UB), wren-lang#1232/wren-lang#1233 (fromString/u64), wren-lang#803 (any/all Bool), wren-lang#1000 (error hygiene), wren-lang#1012/wren-lang#1068 (warning hygiene), wren-lang#1231/wren-lang#1229 (error-path consistency), plus feurhax hardening (GC-rooted attribute copy, MAX_NEST_DEPTH=512 parser cap, call-handle arity clamp) and the 64MB heap-cap / perf-audit follow-ups. Full per-fix archaeology lives in the consumer tree at feurhax-client/third_party/VENDORED.md (wren section). Built with WREN_OPT_META=0 WREN_OPT_RANDOM=0; scripting_test + script_editor_test green.
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Summary
In
addConstant, whenMAX_CONSTANTSis exceeded we callerror()but previously did not return. Execution then fell through toreturn compiler->fn->constants.count - 1, which could emit bytecode with a bogus constant index.Return
-1after reporting the error (consistent with other failure paths in the compiler).Testing