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Avoid double free() of env stack; fix #3860

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Should turn on `MRB_ENV_STACK_UNSHARED` flag only after env stack
reallocation.  `malloc()` may fail.
This commit is contained in:
Yukihiro "Matz" Matsumoto
2017-11-30 08:17:14 +09:00
parent d3e273ba4e
commit 2b9f762ba1
1 changed files with 1 additions and 1 deletions
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src/vm.c
+1 -1
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@@ -283,12 +283,12 @@ mrb_env_unshare(mrb_state *mrb, struct REnv *e)
if (!MRB_ENV_STACK_SHARED_P(e)) return;
if (e->cxt != mrb->c) return;
MRB_ENV_UNSHARE_STACK(e);
p = (mrb_value *)mrb_malloc(mrb, sizeof(mrb_value)*len);
if (len > 0) {
stack_copy(p, e->stack, len);
}
e->stack = p;
MRB_ENV_UNSHARE_STACK(e);
mrb_write_barrier(mrb, (struct RBasic *)e);
}
}