Bug#22377554: server crash after updating/inserting into table with trigger

Some activations of triggers that referenced a NEW value inside a
query might experience a server exit.

Author: roylyseng

sql/item.cc

@@ -1,7 +1,5 @@
-
-
 /*
-   Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
+   Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -1101,7 +1099,7 @@ bool Item_field::check_column_privileges(uchar *arg)
   Internal_error_handler_holder<View_error_handler, TABLE_LIST>
     view_handler(thd, context->view_error_handler,
                  context->view_error_handler_arg);
-  if (check_column_grant_in_table_ref(thd, cached_table,
+  if (check_column_grant_in_table_ref(thd, table_ref,
                                       field_name, strlen(field_name),
                                       thd->want_privilege))
   {