shugo	2009-11-18 10:13:54 +0900 (Wed, 18 Nov 2009)

  New Revision: 25831

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=25831

  Log:
    * vm_method.c (rb_undef): should raise TypeError if klass is nil.
      1.instance_eval { undef to_s } causes SEGV before this fix.
    * test/ruby/test_undef.rb: new tests for undef.

  Modified files:
    trunk/ChangeLog
    trunk/vm_method.c

Index: ChangeLog
===================================================================
--- ChangeLog	(revision 25830)
+++ ChangeLog	(revision 25831)
@@ -1,3 +1,10 @@
+Wed Nov 18 10:12:34 2009  Shugo Maeda  <shugo@r...>
+
+	* vm_method.c (rb_undef): should raise TypeError if klass is nil.
+	  1.instance_eval { undef to_s } causes SEGV before this fix.
+
+	* test/ruby/test_undef.rb: new tests for undef.
+
 Wed Nov 18 08:41:42 2009  Nobuyoshi Nakada  <nobu@r...>
 
 	* string.c (str_utf8_nth): fixed overrun.  [ruby-core:26787]
Index: vm_method.c
===================================================================
--- vm_method.c	(revision 25830)
+++ vm_method.c	(revision 25831)
@@ -574,6 +574,9 @@
 {
     rb_method_entry_t *me;
 
+    if (NIL_P(klass)) {
+	rb_raise(rb_eTypeError, "no class to undef method");
+    }
     if (rb_vm_cbase() == rb_cObject && klass == rb_cObject) {
 	rb_secure(4);
     }

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