gc.c: hide internal objects

* gc.c (id2ref): prohibit from accessing internal objects.
  [ruby-core:68348] [Bug #10918]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49792 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 0 deletions

diff --git a/gc.c b/gc.c
index c84da503ea..b843e7bb73 100644
--- a/gc.c
+++ b/gc.c
@@ -2761,6 +2761,9 @@ id2ref(VALUE obj, VALUE objid)
     if (!is_live_object(objspace, ptr)) {
 	rb_raise(rb_eRangeError, "%p is recycled object", p0);
     }
+    if (RBASIC(ptr)->klass == 0) {
+	rb_raise(rb_eRangeError, "%p is internal object", p0);
+    }
     return (VALUE)ptr;
 }