A fix (bug #6449: DO server-crashing bug).

sql/sql_yacc.yy:
  A fix (bug #6449: DO server-crashing bug).
  expr_list is used for DO command.

mysql-test/r/select.result

@@ -2057,6 +2057,10 @@ t2	1	fld3	1	fld3	A	NULL	NULL	NULL		BTREE
 drop table t4, t3, t2, t1;
 DO 1;
 DO benchmark(100,1+1),1,1;
+do default;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
+do foobar;
+ERROR 42S22: Unknown column 'foobar' in 'field list'
 CREATE TABLE t1 (
 id mediumint(8) unsigned NOT NULL auto_increment,
 pseudo varchar(35) NOT NULL default '',

mysql-test/t/select.test

@@ -1756,6 +1756,15 @@ drop table t4, t3, t2, t1;
 DO 1;
 DO benchmark(100,1+1),1,1;
 
+#
+# Bug #6449: do default;
+#
+
+--error 1064
+do default;
+--error 1054
+do foobar;
+
 #
 # random in WHERE clause
 #

sql/sql_yacc.yy

@@ -3932,11 +3932,12 @@ do:	DO_SYM
 	{
 	  LEX *lex=Lex;
 	  lex->sql_command = SQLCOM_DO;
-	  if (!(lex->insert_list = new List_item))
-	    YYABORT;
+	  mysql_init_select(lex);
+	}
+	expr_list
+	{
+	  Lex->insert_list= $3;
 	}
-	values
-	{}
 	;
 
 /*