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Merge pull request #3615 from clayton-shopify/fix-copy-class-null-pointer-deref

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Check if sc->mt is initialized before copying it.
This commit is contained in:
Yukihiro "Matz" Matsumoto
2017-04-19 07:07:03 +09:00
committed by GitHub
parent 79e0314337 de96994233
commit fe3fe8fccc
1 changed files with 6 additions and 1 deletions
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src/kernel.c
+6 -1
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@@ -241,7 +241,12 @@ copy_class(mrb_state *mrb, mrb_value dst, mrb_value src)
c1->super = mrb_class_ptr(mrb_obj_dup(mrb, mrb_obj_value(c0)));
c1->super->flags |= MRB_FLAG_IS_ORIGIN;
}
dc->mt = kh_copy(mt, mrb, sc->mt);
if (sc->mt) {
dc->mt = kh_copy(mt, mrb, sc->mt);
}
else {
dc->mt = kh_init(mt, mrb);
}
dc->super = sc->super;
MRB_SET_INSTANCE_TT(dc, MRB_INSTANCE_TT(sc));
}