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vm.c: check if target_class is NULL (when prepended).

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Address CVE-2022-1427
This commit is contained in:
Yukihiro "Matz" Matsumoto
2022-04-22 08:32:18 +09:00
parent 82d3b3d11b
commit 11679e3f3a
1 changed files with 1 additions and 4 deletions
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src/vm.c
+1 -4
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@@ -1753,10 +1753,7 @@ RETRY_TRY_BLOCK:
mrb_exc_set(mrb, exc);
goto L_RAISE;
}
if (target_class->flags & MRB_FL_CLASS_IS_PREPENDED) {
target_class = mrb_vm_ci_target_class(ci);
}
else if (target_class->tt == MRB_TT_MODULE) {
if ((target_class->flags & MRB_FL_CLASS_IS_PREPENDED) || target_class->tt == MRB_TT_MODULE) {
target_class = mrb_vm_ci_target_class(ci);
if (!target_class || target_class->tt != MRB_TT_ICLASS) {
goto super_typeerror;