object.c: restrict freeze option

* object.c (rb_obj_clone2): restrict freeze option to true other
  than false which only has the effect.  [Feature #12300]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55808 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 0 deletions

diff --git a/object.c b/object.c
index a4a87db4d6..c58a46b293 100644
--- a/object.c
+++ b/object.c
@@ -339,6 +339,10 @@ rb_obj_clone2(int argc, VALUE *argv, VALUE obj)
     if (!NIL_P(opt)) {
 	rb_get_kwargs(opt, keyword_ids, 0, 1, kwargs);
 	kwfreeze = kwargs[0];
+	if (kwfreeze != Qundef && kwfreeze != Qtrue && kwfreeze != Qfalse) {
+	    rb_raise(rb_eArgError, "unexpected value for freeze: %s",
+		     rb_builtin_class_name(kwfreeze));
+	}
     }
 
     if (rb_special_const_p(obj)) {