Avoiding removing dummy TABLE allocated on the stack (BUG#14726).

mysql-test/r/view_grant.result:
  BUG#14726 test suite.
mysql-test/t/view_grant.test:
  BUG#14726 test suite.

mysql-test/r/view_grant.result

@@ -501,3 +501,20 @@ drop user test14256;
 insert into mysql.user select * from t1;
 flush privileges;
 drop table t1;
+create database mysqltest;
+use mysqltest;
+CREATE TABLE t1 (i INT);
+CREATE VIEW  v1 AS SELECT * FROM t1;
+SHOW CREATE VIEW v1;
+View	Create View
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t1`.`i` AS `i` from `t1`
+GRANT SELECT, LOCK TABLES ON mysqltest.* TO mysqltest_1@localhost;
+use mysqltest;
+LOCK TABLES v1 READ;
+SHOW CREATE TABLE v1;
+ERROR 42000: SHOW VIEW command denied to user 'mysqltest_1'@'localhost' for table 'v1'
+UNLOCK TABLES;
+use test;
+use test;
+drop user mysqltest_1@localhost;
+drop database mysqltest;

mysql-test/t/view_grant.test

@@ -664,3 +664,39 @@ insert into mysql.user select * from t1;
 flush privileges;
 
 drop table t1;
+
+#
+# BUG#14726: freeing stack variable in case of an error of opening
+# a view when we have locked tables with LOCK TABLES statement.
+#
+connection root;
+--disable_warnings
+create database mysqltest;
+--enable_warnings
+
+use mysqltest;
+CREATE TABLE t1 (i INT);
+CREATE VIEW  v1 AS SELECT * FROM t1;
+SHOW CREATE VIEW v1;
+GRANT SELECT, LOCK TABLES ON mysqltest.* TO mysqltest_1@localhost;
+
+connection user1;
+
+use mysqltest;
+LOCK TABLES v1 READ;
+-- error ER_TABLEACCESS_DENIED_ERROR
+SHOW CREATE TABLE v1;
+UNLOCK TABLES;
+use test;
+
+connection root;
+use test;
+drop user mysqltest_1@localhost;
+drop database mysqltest;
+
+#
+# switch to default connaction
+#
+disconnect user1;
+disconnect root;
+connection default;

sql/sql_base.cc

@@ -1199,17 +1199,16 @@ TABLE *open_table(THD *thd, TABLE_LIST *table_list, MEM_ROOT *mem_root,
       (void) unpack_filename(path, path);
       if (mysql_frm_type(thd, path, &not_used) == FRMTYPE_VIEW)
       {
-        TABLE tab;// will not be used (because it's VIEW) but have to be passed
+        /*
+          Will not be used (because it's VIEW) but has to be passed.
+          Also we will not free it (because it is a stack variable).
+        */
+        TABLE tab;
         table= &tab;
         VOID(pthread_mutex_lock(&LOCK_open));
-        if (open_unireg_entry(thd, table, table_list->db,
-                              table_list->table_name,
-                              alias, table_list, mem_root))
-        {
-          table->next=table->prev=table;
-          free_cache_entry(table);
-        }
-        else
+        if (!open_unireg_entry(thd, table, table_list->db,
+                               table_list->table_name,
+                               alias, table_list, mem_root))
         {
           DBUG_ASSERT(table_list->view != 0);
           VOID(pthread_mutex_unlock(&LOCK_open));