* encoding.c (check_encoding): Check T_DATA or not.

is_data_encoding(obj) assumes that `obj' is T_DATA.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42162 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Thu Jul 25 16:17:55 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* encoding.c (check_encoding): Check T_DATA or not.
+	  is_data_encoding(obj) assumes that `obj' is T_DATA.
+
 Thu Jul 25 13:06:46 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* dir.c (dir_s_home): use rb_home_dir_of and rb_default_home_dir.

encoding.c

@@ -121,7 +121,7 @@ check_encoding(rb_encoding *enc)
 static int
 enc_check_encoding(VALUE obj)
 {
-    if (!is_data_encoding(obj)) {
+    if (!RB_TYPE_P(obj, T_DATA) || !is_data_encoding(obj)) {
 	return -1;
     }
     return check_encoding(RDATA(obj)->data);