Avoid unsharing env when context (mrb->c) differs; ref #3668

57ffa1c1 · Yukihiro "Matz" Matsumoto · 54b45f6a · 57ffa1c1
Commit 57ffa1c1 authored May 27, 2017 by Yukihiro "Matz" Matsumoto
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src/vm.c src/vm.c +1 -0

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--- a/src/vm.c
+++ b/src/vm.c
@@ -264,6 +264,7 @@ mrb_env_unshare(mrb_state *mrb, struct REnv *e)
  mrb_value *p;

  if (!MRB_ENV_STACK_SHARED_P(e)) return;
+  if (e->cxt.c != mrb->c) return;
  if (e->cioff == 0 && e->cxt.c == mrb->root_c) return;
  MRB_ENV_UNSHARE_STACK(e);
  if (!e->c) {