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]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57249 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 10 insertions, 3 deletions

diff --git a/object.c b/object.c
index 5f0055fb5a..67d23ef830 100644
--- a/object.c
+++ b/object.c
@@ -1886,8 +1886,8 @@ rb_class_allocate_instance(VALUE klass)
  *
  */
 
-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 VALUE *argv, VALUE klass)
     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)
     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);