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Check stack size before accessing env stack; fix #3727

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This commit is contained in:
Yukihiro "Matz" Matsumoto
2017-07-05 09:19:06 +09:00
parent cc01dedc65
commit bd66c5d716
1 changed files with 2 additions and 1 deletions
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src/vm.c
+2 -1
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@@ -2156,7 +2156,8 @@ RETRY_TRY_BLOCK:
else {
struct REnv *e = uvenv(mrb, lv-1);
if (!e || e->cioff == 0 ||
(!MRB_ENV_STACK_SHARED_P(e) && e->cxt.mid == 0)) {
(!MRB_ENV_STACK_SHARED_P(e) && e->cxt.mid == 0) ||
MRB_ENV_STACK_LEN(e) <= m1+r+m2+1) {
localjump_error(mrb, LOCALJUMP_ERROR_YIELD);
goto L_RAISE;
}