fixed priority checking bug in sub select handling

mysql-test/r/subselect.result:
  fixed subselect test
mysql-test/t/subselect.test:
  fixed subselect test

mysql-test/r/subselect.result

@@ -606,14 +606,14 @@ x
 3
 INSERT INTO t1 (x) select (SELECT SUM(x)+2 FROM t1) FROM t2;
 You can't specify target table 't1' for update in FROM clause
-INSERT DELAYED INTO t1 (x) VALUES ((SELECT SUM(x) FROM t2));
+INSERT DELAYED INTO t1 (x) VALUES ((SELECT SUM(a) FROM t2));
 select * from t1;
 x
 1
 2
 3
 3
-0
+2
 drop table t1, t2, t3;
 CREATE TABLE t1 (x int not null, y int, primary key (x));
 create table t2 (a int);
@@ -688,6 +688,8 @@ id
 2
 INSERT INTO t2 VALUES ((SELECT * FROM t2));
 You can't specify target table 't2' for update in FROM clause
+INSERT INTO t2 VALUES ((SELECT id FROM t2));
+You can't specify target table 't2' for update in FROM clause
 SELECT * FROM t2;
 id
 1

mysql-test/t/subselect.test

@@ -351,7 +351,7 @@ INSERT INTO t1 (x) select (SELECT SUM(a)+1 FROM t2) FROM t2;
 select * from t1;
 -- error 1093
 INSERT INTO t1 (x) select (SELECT SUM(x)+2 FROM t1) FROM t2;
-INSERT DELAYED INTO t1 (x) VALUES ((SELECT SUM(x) FROM t2));
+INSERT DELAYED INTO t1 (x) VALUES ((SELECT SUM(a) FROM t2));
 -- sleep 1
 select * from t1;
 drop table t1, t2, t3;

sql/sql_parse.cc

@@ -2285,15 +2285,23 @@ mysql_execute_command(THD *thd)
     TABLE_LIST *table;
     if (check_db_used(thd,tables))
       goto error;
-    for (table=tables ; table ; table=table->next)
+
+    if (check_access(thd,UPDATE_ACL,tables->db,&tables->grant.privilege))
+      goto error;
     {
-      if (table->derived)
-	table->grant.privilege= SELECT_ACL;
-      else if (check_access(thd,UPDATE_ACL,table->db,&table->grant.privilege))
+      // Show only 1 table for check_grant
+      TABLE_LIST *subselects_tables= tables->next;
+      tables->next= 0;
+      if (grant_option && check_grant(thd, UPDATE_ACL, tables))
 	goto error;
-    }
-    if (grant_option && check_grant(thd,UPDATE_ACL,tables))
+      tables->next= subselects_tables;
+
+      // check rights on tables of subselect (if exists)
+      if (subselects_tables &&
+	  (res= check_table_access(thd, SELECT_ACL, subselects_tables)))
 	goto error;
+    }
+
     if (select_lex->item_list.elements != lex->value_list.elements)
     {
       send_error(thd,ER_WRONG_VALUE_COUNT);
@@ -2349,8 +2357,21 @@ mysql_execute_command(THD *thd)
                       INSERT_ACL | DELETE_ACL : INSERT_ACL | update);
     if (check_access(thd,privilege,tables->db,&tables->grant.privilege))
       goto error; /* purecov: inspected */
-    if (grant_option && check_grant(thd,privilege,tables))
+    
+    {
+      // Show only 1 table for check_grant
+      TABLE_LIST *subselects_tables= tables->next;
+      tables->next= 0;
+      if (grant_option && check_grant(thd, privilege, tables))
 	goto error;
+      tables->next= subselects_tables;
+
+      // check rights on tables of subselect (if exists)
+      if (subselects_tables &&
+	  (res= check_table_access(thd, SELECT_ACL, subselects_tables)))
+	goto error;
+    }
+
     if (select_lex->item_list.elements != lex->value_list.elements)
     {
       send_error(thd,ER_WRONG_VALUE_COUNT);
@@ -2434,8 +2455,21 @@ mysql_execute_command(THD *thd)
   {
     if (check_access(thd,DELETE_ACL,tables->db,&tables->grant.privilege))
       goto error; /* purecov: inspected */
-    if (grant_option && check_grant(thd,DELETE_ACL,tables))
+
+    {
+      // Show only 1 table for check_grant
+      TABLE_LIST *subselects_tables= tables->next;
+      tables->next= 0;
+      if (grant_option && check_grant(thd, DELETE_ACL, tables))
+	goto error;
+      tables->next= subselects_tables;
+
+      // check rights on tables of subselect (if exists)
+      if (subselects_tables &&
+	  (res= check_table_access(thd, SELECT_ACL, subselects_tables)))
 	goto error;
+    }
+
     // Set privilege for the WHERE clause
     tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
     res = mysql_delete(thd,tables, select_lex->where,