nobu	2017-01-02 09:03:28 +0900 (Mon, 02 Jan 2017)

  New Revision: 57249

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=57249

  Log:
    object.c: rb_class_s_new
    
    * object.c (rb_class_new_instance): add pathological check of
      klass for extension libraries which do not check given arguments
      properly.  [ruby-core:78934] [Bug #13093]

  Modified files:
    trunk/object.c
Index: object.c
===================================================================
--- object.c	(revision 57248)
+++ object.c	(revision 57249)
@@ -1886,8 +1886,8 @@ rb_class_allocate_instance(VALUE klass) https://github.com/ruby/ruby/blob/trunk/object.c#L1886
  *
  */
 
-VALUE
-rb_class_new_instance(int argc, const VALUE *argv, VALUE klass)
+static VALUE
+rb_class_s_new(int argc, const VALUE *argv, VALUE klass)
 {
     VALUE obj;
 
@@ -1897,6 +1897,13 @@ rb_class_new_instance(int argc, const VA https://github.com/ruby/ruby/blob/trunk/object.c#L1897
     return obj;
 }
 
+VALUE
+rb_class_new_instance(int argc, const VALUE *argv, VALUE klass)
+{
+    Check_Type(klass, T_CLASS);
+    return rb_class_s_new(argc, argv, klass);
+}
+
 /*
  *  call-seq:
  *     class.superclass -> a_super_class or nil
@@ -3580,7 +3587,7 @@ InitVM_Object(void) https://github.com/ruby/ruby/blob/trunk/object.c#L3587
     rb_define_method(rb_cModule, "singleton_class?", rb_mod_singleton_p, 0);
 
     rb_define_method(rb_cClass, "allocate", rb_obj_alloc, 0);
-    rb_define_method(rb_cClass, "new", rb_class_new_instance, -1);
+    rb_define_method(rb_cClass, "new", rb_class_s_new, -1);
     rb_define_method(rb_cClass, "initialize", rb_class_initialize, -1);
     rb_define_method(rb_cClass, "superclass", rb_class_superclass, 0);
     rb_define_alloc_func(rb_cClass, rb_class_s_alloc);

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