MDEV-23094: Multiple calls to a Stored Procedure from another Stored Procedure crashes server

Added system-SELECT to IF/WHILE/REPET/FOR for correct subqueries connecting.

Added control of system/usual selects for correct error detection.

mysql-test/main/parser.result

@@ -1908,4 +1908,93 @@ KILL ( SELECT 1 ) + LASTVAL(s);
 ERROR 42000: KILL does not support subqueries or stored functions
 KILL LASTVAL(s);
 ERROR 42000: KILL does not support subqueries or stored functions
+#
+# MDEV-23094: Multiple calls to a Stored Procedure from another
+# Stored Procedure crashes server
+#
+create table t1 (id1 int primary key, data1 int);
+create table t2 (id2 int primary key, data2 int);
+create procedure p1(IN id int, IN dt int)
+begin
+if (exists(select * from t1 where id1 = id and data1 = dt) or
+not exists (select * from t2 where id2 = id and data2 = dt))
+then
+select 1;
+end if;
+end //
+call p1(1,2);
+1
+1
+call p1(1,2);
+1
+1
+drop procedure p1;
+create procedure p1(IN id int, IN dt int)
+begin
+case (exists(select * from t1 where id1 = id and data1 = dt) or
+not exists (select * from t2 where id2 = id and data2 = dt))
+when 1 then
+select 1;
+else
+select 0;
+end case;
+end //
+call p1(1,2);
+1
+1
+call p1(1,2);
+1
+1
+drop procedure p1;
+create procedure p1(IN id int, IN dt int)
+begin
+declare wcont int default 1;
+while (exists(select * from t1 where id1 = id and data1 = dt) or
+not exists (select * from t2 where id2 = id and data2 = dt)) and wcont
+do
+select 1;
+set wcont=0;
+end while;
+end //
+call p1(1,2);
+1
+1
+call p1(1,2);
+1
+1
+drop procedure p1;
+create procedure p1(IN id int, IN dt int)
+begin
+declare count int default 1;
+repeat
+select 1;
+set count=count+1;
+until (exists(select * from t1 where id1 = id and data1 = dt) or
+not exists (select * from t2 where id2 = id and data2 = dt)) and
+count < 3
+end repeat;
+end //
+call p1(1,2);
+1
+1
+call p1(1,2);
+1
+1
+drop procedure p1;
+create procedure p1(IN id int, IN dt int)
+begin
+for i in 1..(exists(select * from t1 where id1 = id and data1 = dt) or
+not exists (select * from t2 where id2 = id and data2 = dt))
+do
+select 1;
+end for;
+end //
+call p1(1,2);
+1
+1
+call p1(1,2);
+1
+1
+drop procedure p1;
+drop table t1,t2;
 # End of 10.4 tests

mysql-test/main/parser.test

@@ -1696,4 +1696,101 @@ KILL ( SELECT 1 ) + LASTVAL(s);
 --error ER_SUBQUERIES_NOT_SUPPORTED
 KILL LASTVAL(s);
 
+--echo #
+--echo # MDEV-23094: Multiple calls to a Stored Procedure from another
+--echo # Stored Procedure crashes server
+--echo #
+
+create table t1 (id1 int primary key, data1 int);
+create table t2 (id2 int primary key, data2 int);
+
+delimiter //;
+create procedure p1(IN id int, IN dt int)
+begin
+  if (exists(select * from t1 where id1 = id and data1 = dt) or
+      not exists (select * from t2 where id2 = id and data2 = dt))
+  then
+      select 1;
+  end if;
+end //
+delimiter ;//
+
+call p1(1,2);
+call p1(1,2);
+
+drop procedure p1;
+
+delimiter //;
+create procedure p1(IN id int, IN dt int)
+begin
+case (exists(select * from t1 where id1 = id and data1 = dt) or
+      not exists (select * from t2 where id2 = id and data2 = dt))
+when 1 then
+  select 1;
+else
+  select 0;
+end case;
+end //
+delimiter ;//
+
+call p1(1,2);
+call p1(1,2);
+
+drop procedure p1;
+
+delimiter //;
+create procedure p1(IN id int, IN dt int)
+begin
+declare wcont int default 1;
+while (exists(select * from t1 where id1 = id and data1 = dt) or
+      not exists (select * from t2 where id2 = id and data2 = dt)) and wcont
+do
+  select 1;
+  set wcont=0;
+end while;
+end //
+delimiter ;//
+
+call p1(1,2);
+call p1(1,2);
+
+drop procedure p1;
+
+delimiter //;
+create procedure p1(IN id int, IN dt int)
+begin
+declare count int default 1;
+repeat
+  select 1;
+  set count=count+1;
+until (exists(select * from t1 where id1 = id and data1 = dt) or
+      not exists (select * from t2 where id2 = id and data2 = dt)) and
+      count < 3
+end repeat;
+end //
+delimiter ;//
+
+call p1(1,2);
+call p1(1,2);
+
+drop procedure p1;
+
+delimiter //;
+create procedure p1(IN id int, IN dt int)
+begin
+for i in 1..(exists(select * from t1 where id1 = id and data1 = dt) or
+             not exists (select * from t2 where id2 = id and data2 = dt))
+do
+  select 1;
+end for;
+end //
+delimiter ;//
+
+call p1(1,2);
+call p1(1,2);
+
+drop procedure p1;
+
+drop table t1,t2;
+
 --echo # End of 10.4 tests

mysql-test/suite/compat/oracle/r/parser.result

@@ -643,3 +643,118 @@ END;
 #
 # End of 10.3 tests
 #
+#
+# MDEV-21998: Server crashes in st_select_lex::add_table_to_list
+# upon mix of KILL and sequences
+#
+KILL ( SELECT 1 ) + LASTVAL(s);
+ERROR 42000: KILL does not support subqueries or stored functions
+KILL LASTVAL(s);
+ERROR 42000: KILL does not support subqueries or stored functions
+#
+# MDEV-23094: Multiple calls to a Stored Procedure from another
+# Stored Procedure crashes server
+#
+create table t1 (id1 int primary key, data1 int);
+create table t2 (id2 int primary key, data2 int);
+create procedure p1(id int,dt int) as
+begin
+if (exists(select * from t1 where id1 = id and data1 = dt) or
+not exists (select * from t2 where id2 = id and data2 = dt))
+then
+select 1;
+end if;
+end //
+call p1(1,2);
+1
+1
+call p1(1,2);
+1
+1
+drop procedure p1;
+create procedure p1(id int, dt int) as
+begin
+case (exists(select * from t1 where id1 = id and data1 = dt) or
+not exists (select * from t2 where id2 = id and data2 = dt))
+when 1 then
+select 1;
+else
+select 0;
+end case;
+end //
+call p1(1,2);
+1
+1
+call p1(1,2);
+1
+1
+drop procedure p1;
+create procedure p1(id int, dt int) as
+begin
+declare wcont int default 1;
+begin
+while (exists(select * from t1 where id1 = id and data1 = dt) or
+not exists (select * from t2 where id2 = id and data2 = dt)) and wcont
+loop
+select 1;
+set wcont=0;
+end loop;
+end;
+end //
+call p1(1,2);
+1
+1
+call p1(1,2);
+1
+1
+drop procedure p1;
+create procedure p1(id int, dt int) as
+begin
+declare count int default 1;
+begin
+repeat
+select 1;
+set count=count+1;
+until (exists(select * from t1 where id1 = id and data1 = dt) or
+not exists (select * from t2 where id2 = id and data2 = dt)) and
+count < 3
+end repeat;
+end;
+end //
+call p1(1,2);
+1
+1
+call p1(1,2);
+1
+1
+drop procedure p1;
+create procedure p1(id int, dt int) as
+begin
+for i in 1..(exists(select * from t1 where id1 = id and data1 = dt) or
+not exists (select * from t2 where id2 = id and data2 = dt))
+loop
+select 1;
+end loop;
+end //
+call p1(1,2);
+1
+1
+call p1(1,2);
+1
+1
+drop procedure p1;
+set sql_mode=ORACLE;
+create or replace procedure p1(id int, dt int) as
+begin
+while (1)
+loop
+exit when (exists(select * from t1 where id1 = id and data1 = dt) or
+not exists (select * from t2 where id2 = id and data2 = dt));
+end loop;
+end;
+//
+call p1(1,2);
+call p1(1,2);
+drop procedure p1;
+drop table t1,t2;
+# End of 10.4 tests

mysql-test/suite/compat/oracle/t/parser.test

@@ -459,3 +459,135 @@ DELIMITER ;//
 --echo #
 --echo # End of 10.3 tests
 --echo #
+
+
+--echo #
+--echo # MDEV-21998: Server crashes in st_select_lex::add_table_to_list
+--echo # upon mix of KILL and sequences
+--echo #
+
+--error ER_SUBQUERIES_NOT_SUPPORTED
+KILL ( SELECT 1 ) + LASTVAL(s);
+--error ER_SUBQUERIES_NOT_SUPPORTED
+KILL LASTVAL(s);
+
+--echo #
+--echo # MDEV-23094: Multiple calls to a Stored Procedure from another
+--echo # Stored Procedure crashes server
+--echo #
+
+create table t1 (id1 int primary key, data1 int);
+create table t2 (id2 int primary key, data2 int);
+
+delimiter //;
+create procedure p1(id int,dt int) as
+begin
+  if (exists(select * from t1 where id1 = id and data1 = dt) or
+      not exists (select * from t2 where id2 = id and data2 = dt))
+  then
+      select 1;
+  end if;
+end //
+delimiter ;//
+
+call p1(1,2);
+call p1(1,2);
+
+drop procedure p1;
+
+delimiter //;
+create procedure p1(id int, dt int) as
+begin
+case (exists(select * from t1 where id1 = id and data1 = dt) or
+      not exists (select * from t2 where id2 = id and data2 = dt))
+when 1 then
+  select 1;
+else
+  select 0;
+end case;
+end //
+delimiter ;//
+
+call p1(1,2);
+call p1(1,2);
+
+drop procedure p1;
+
+delimiter //;
+create procedure p1(id int, dt int) as
+begin
+declare wcont int default 1;
+begin
+  while (exists(select * from t1 where id1 = id and data1 = dt) or
+        not exists (select * from t2 where id2 = id and data2 = dt)) and wcont
+  loop
+    select 1;
+    set wcont=0;
+  end loop;
+end;
+end //
+delimiter ;//
+
+call p1(1,2);
+call p1(1,2);
+
+drop procedure p1;
+
+delimiter //;
+create procedure p1(id int, dt int) as
+begin
+declare count int default 1;
+begin
+  repeat
+    select 1;
+    set count=count+1;
+  until (exists(select * from t1 where id1 = id and data1 = dt) or
+        not exists (select * from t2 where id2 = id and data2 = dt)) and
+        count < 3
+  end repeat;
+end;
+end //
+delimiter ;//
+
+call p1(1,2);
+call p1(1,2);
+
+drop procedure p1;
+
+delimiter //;
+create procedure p1(id int, dt int) as
+begin
+for i in 1..(exists(select * from t1 where id1 = id and data1 = dt) or
+             not exists (select * from t2 where id2 = id and data2 = dt))
+loop
+  select 1;
+end loop;
+end //
+delimiter ;//
+
+call p1(1,2);
+call p1(1,2);
+
+drop procedure p1;
+
+delimiter //;
+set sql_mode=ORACLE;
+create or replace procedure p1(id int, dt int) as
+begin
+  while (1)
+  loop
+    exit when (exists(select * from t1 where id1 = id and data1 = dt) or
+               not exists (select * from t2 where id2 = id and data2 = dt));
+  end loop;
+end;
+//
+delimiter ;//
+
+call p1(1,2);
+call p1(1,2);
+
+drop procedure p1;
+
+drop table t1,t2;
+
+--echo # End of 10.4 tests

sql/sql_lex.cc

@@ -2428,6 +2428,7 @@ void st_select_lex::init_query()
   changed_elements= 0;
   first_natural_join_processing= 1;
   first_cond_optimization= 1;
+  is_service_select= 0;
   parsing_place= NO_MATTER;
   save_parsing_place= NO_MATTER;
   exclude_from_table_unique_test= no_wrap_view_item= FALSE;
@@ -7614,7 +7615,7 @@ Item *LEX::create_item_ident_sp(THD *thd, Lex_ident_sys_st *name,
       return new (thd->mem_root) Item_func_sqlerrm(thd);
   }
 
-  if (!select_stack_head() &&
+  if (fields_are_impossible() &&
       (current_select->parsing_place != FOR_LOOP_BOUND ||
        spcont->find_cursor(name, &unused_off, false) == NULL))
   {
@@ -8940,11 +8941,12 @@ void st_select_lex::add_statistics(SELECT_LEX_UNIT *unit)
 }
 
 
-bool LEX::main_select_push()
+bool LEX::main_select_push(bool service)
 {
   DBUG_ENTER("LEX::main_select_push");
   current_select_number= 1;
   builtin_select.select_number= 1;
+  builtin_select.is_service_select= service;
   if (push_select(&builtin_select))
     DBUG_RETURN(TRUE);
   DBUG_RETURN(FALSE);

sql/sql_lex.h

@@ -1249,6 +1249,8 @@ public:
   bool no_wrap_view_item;
   /* exclude this select from check of unique_table() */
   bool exclude_from_table_unique_test;
+  /* the select is "service-select" and can not have tables*/
+  bool is_service_select;
   /* index in the select list of the expression currently being fixed */
   int cur_pos_in_select_list;
 
@@ -4413,7 +4415,7 @@ public:
   SELECT_LEX_UNIT *create_unit(SELECT_LEX*);
   SELECT_LEX *wrap_unit_into_derived(SELECT_LEX_UNIT *unit);
   SELECT_LEX *wrap_select_chain_into_derived(SELECT_LEX *sel);
-  bool main_select_push();
+  bool main_select_push(bool service= false);
   bool insert_select_hack(SELECT_LEX *sel);
   SELECT_LEX *create_priority_nest(SELECT_LEX *first_in_nest);
 
@@ -4530,6 +4532,16 @@ public:
                      Lex_field_type_st *type) const;
 
   void mark_first_table_as_inserting();
+
+  bool fields_are_impossible()
+  {
+    // no select or it is last select with no tables (service select)
+    return !select_stack_head() ||
+           (select_stack_top == 1 &&
+            select_stack[0]->is_service_select);
+  }
+
+
 };
 
 

sql/sql_parse.cc

@@ -8049,6 +8049,7 @@ TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
                         (alias ? alias->str : table->table.str),
                         table,
                         this, select_number));
+  DBUG_ASSERT(!is_service_select  || (table_options & TL_OPTION_SEQUENCE));
 
   if (unlikely(!table))
     DBUG_RETURN(0);				// End of memory

sql/sql_select.cc

@@ -1131,6 +1131,8 @@ JOIN::prepare(TABLE_LIST *tables_init,
   proc_param= proc_param_init;
   tables_list= tables_init;
   select_lex= select_lex_arg;
+  DBUG_PRINT("info", ("select %p (%u) = JOIN %p",
+                      select_lex, select_lex->select_number, this));
   select_lex->join= this;
   join_list= &select_lex->top_join_list;
   union_part= unit_arg->is_unit_op();
@@ -4494,6 +4496,9 @@ int
 JOIN::destroy()
 {
   DBUG_ENTER("JOIN::destroy");
+
+  DBUG_PRINT("info", ("select %p (%u) <> JOIN %p",
+                      select_lex, select_lex->select_number, this));
   select_lex->join= 0;
 
   cond_equal= 0;

sql/sql_union.cc

@@ -2080,6 +2080,8 @@ bool st_select_lex::cleanup()
   bool error= FALSE;
   DBUG_ENTER("st_select_lex::cleanup()");
 
+  DBUG_PRINT("info", ("select: %p (%u)  JOIN %p",
+                      this, select_number, join));
   cleanup_order(order_list.first);
   cleanup_order(group_list.first);
   cleanup_ftfuncs(this);

sql/sql_yacc.yy

@@ -2809,8 +2809,6 @@ create:
           {
             Lex->create_info.default_table_charset= NULL;
             Lex->create_info.used_fields= 0;
-            if (Lex->main_select_push())
-              MYSQL_YYABORT;
           }
           opt_create_database_options
           {
@@ -2819,7 +2817,6 @@ create:
                          $1 | $3)))
                MYSQL_YYABORT;
             lex->name= $4;
-            Lex->pop_select(); //main select
           }
         | create_or_replace definer_opt opt_view_suid VIEW_SYM
           opt_if_not_exists table_ident
@@ -3653,10 +3650,13 @@ sp_cursor_stmt:
           {
             DBUG_ASSERT(thd->free_list == NULL);
             Lex->sphead->reset_lex(thd, $1);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
           }
           select
           {
             DBUG_ASSERT(Lex == $1);
+            Lex->pop_select(); //main select
             if (unlikely($1->stmt_finalize(thd)) ||
                 unlikely($1->sphead->restore_lex(thd)))
               MYSQL_YYABORT;
@@ -4154,6 +4154,11 @@ sp_proc_stmt_statement:
             Lex_input_stream *lip= YYLIP;
 
             lex->sphead->reset_lex(thd);
+            /*
+              We should not push main select here, it will be done or not
+              done by the statement, we just provide only a new LEX for the
+              statement here as if it is start of parsing a new statement.
+            */
             lex->sphead->m_tmp_query= lip->get_tok_start();
           }
           statement
@@ -4172,11 +4177,16 @@ RETURN_ALLMODES_SYM:
 
 sp_proc_stmt_return:
           RETURN_ALLMODES_SYM
-          { Lex->sphead->reset_lex(thd); }
+          {
+            Lex->sphead->reset_lex(thd);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
+          }
           expr
           {
             LEX *lex= Lex;
             sp_head *sp= lex->sphead;
+            Lex->pop_select(); //main select
             if (unlikely(sp->m_handler->add_instr_freturn(thd, sp, lex->spcont,
                                                           $3, lex)) ||
                 unlikely(sp->restore_lex(thd)))
@@ -4193,7 +4203,16 @@ sp_proc_stmt_return:
         ;
 
 reset_lex_expr:
-          { Lex->sphead->reset_lex(thd); } expr { $$= $2; }
+          {
+            Lex->sphead->reset_lex(thd);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
+          }
+          expr
+          {
+            Lex->pop_select(); //main select
+            $$= $2;
+          }
         ;
 
 sp_proc_stmt_exit_oracle:
@@ -4285,6 +4304,8 @@ assignment_source_expr:
           {
             DBUG_ASSERT(thd->free_list == NULL);
             Lex->sphead->reset_lex(thd, $1);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
           }
           expr
           {
@@ -4293,6 +4314,7 @@ assignment_source_expr:
             $$->sp_lex_in_use= true;
             $$->set_item_and_free_list($3, thd->free_list);
             thd->free_list= NULL;
+            Lex->pop_select(); //min select
             if ($$->sphead->restore_lex(thd))
               MYSQL_YYABORT;
           }
@@ -4302,6 +4324,8 @@ for_loop_bound_expr:
           assignment_source_lex
           {
             Lex->sphead->reset_lex(thd, $1);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
             Lex->current_select->parsing_place= FOR_LOOP_BOUND;
           }
           expr
@@ -4310,6 +4334,7 @@ for_loop_bound_expr:
             $$= $1;
             $$->sp_lex_in_use= true;
             $$->set_item_and_free_list($3, NULL);
+            Lex->pop_select(); //main select
             if (unlikely($$->sphead->restore_lex(thd)))
               MYSQL_YYABORT;
             Lex->current_select->parsing_place= NO_MATTER;
@@ -4424,7 +4449,11 @@ sp_fetch_list:
         ;
 
 sp_if:
-          { Lex->sphead->reset_lex(thd); }
+          {
+            Lex->sphead->reset_lex(thd);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
+          }
           expr THEN_SYM
           {
             LEX *lex= Lex;
@@ -4438,6 +4467,7 @@ sp_if:
                 unlikely(sp->add_cont_backpatch(i)) ||
                 unlikely(sp->add_instr(i)))
               MYSQL_YYABORT;
+            Lex->pop_select(); //main select
             if (unlikely(sp->restore_lex(thd)))
               MYSQL_YYABORT;
           }
@@ -4538,12 +4568,17 @@ case_stmt_specification:
         ;
 
 case_stmt_body:
-          { Lex->sphead->reset_lex(thd); /* For expr $2 */ }
+          {
+            Lex->sphead->reset_lex(thd); /* For expr $2 */
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
+          }
           expr
           {
             if (unlikely(Lex->case_stmt_action_expr($2)))
               MYSQL_YYABORT;
 
+            Lex->pop_select(); //main select
             if (Lex->sphead->restore_lex(thd))
               MYSQL_YYABORT;
           }
@@ -4567,6 +4602,8 @@ simple_when_clause:
           WHEN_SYM
           {
             Lex->sphead->reset_lex(thd); /* For expr $3 */
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
           }
           expr
           {
@@ -4575,6 +4612,7 @@ simple_when_clause:
             LEX *lex= Lex;
             if (unlikely(lex->case_stmt_action_when($3, true)))
               MYSQL_YYABORT;
+            Lex->pop_select(); //main select
             /* For expr $3 */
             if (unlikely(lex->sphead->restore_lex(thd)))
               MYSQL_YYABORT;
@@ -4591,12 +4629,15 @@ searched_when_clause:
           WHEN_SYM
           {
             Lex->sphead->reset_lex(thd); /* For expr $3 */
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
           }
           expr
           {
             LEX *lex= Lex;
             if (unlikely(lex->case_stmt_action_when($3, false)))
               MYSQL_YYABORT;
+            Lex->pop_select(); //main select
             /* For expr $3 */
             if (unlikely(lex->sphead->restore_lex(thd)))
               MYSQL_YYABORT;
@@ -4695,9 +4736,15 @@ opt_sp_for_loop_direction:
         ;
 
 sp_for_loop_index_and_bounds:
-          ident sp_for_loop_bounds
+          ident
           {
-            if (unlikely(Lex->sp_for_loop_declarations(thd, &$$, &$1, $2)))
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
+          }
+          sp_for_loop_bounds
+          {
+            Lex->pop_select(); //main select
+            if (unlikely(Lex->sp_for_loop_declarations(thd, &$$, &$1, $3)))
               MYSQL_YYABORT;
           }
         ;
@@ -4743,8 +4790,11 @@ while_body:
             LEX *lex= Lex;
             if (unlikely(lex->sp_while_loop_expression(thd, $1)))
               MYSQL_YYABORT;
+            Lex->pop_select(); //main select
             if (lex->sphead->restore_lex(thd))
               MYSQL_YYABORT;
+            if (lex->main_select_push(true))
+               MYSQL_YYABORT;
           }
           sp_proc_stmts1 END WHILE_SYM
           {
@@ -4755,7 +4805,11 @@ while_body:
 
 repeat_body:
           sp_proc_stmts1 UNTIL_SYM 
-          { Lex->sphead->reset_lex(thd); }
+          {
+            Lex->sphead->reset_lex(thd);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
+          }
           expr END REPEAT_SYM
           {
             LEX *lex= Lex;
@@ -4766,6 +4820,7 @@ repeat_body:
             if (unlikely(i == NULL) ||
                 unlikely(lex->sphead->add_instr(i)))
               MYSQL_YYABORT;
+            Lex->pop_select(); //main select
             if (lex->sphead->restore_lex(thd))
               MYSQL_YYABORT;
             /* We can shortcut the cont_backpatch here */
@@ -4794,6 +4849,8 @@ sp_labeled_control:
             if (unlikely(Lex->sp_push_loop_label(thd, &$1)))
               MYSQL_YYABORT;
             Lex->sphead->reset_lex(thd);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
           }
           while_body pop_sp_loop_label
           { }
@@ -4845,6 +4902,8 @@ sp_unlabeled_control:
             if (unlikely(Lex->sp_push_loop_empty_label(thd)))
               MYSQL_YYABORT;
             Lex->sphead->reset_lex(thd);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
           }
           while_body
           {
@@ -7816,7 +7875,7 @@ alter:
           {
             Lex->create_info.default_table_charset= NULL;
             Lex->create_info.used_fields= 0;
-            if (Lex->main_select_push())
+            if (Lex->main_select_push(true))
               MYSQL_YYABORT;
           }
           create_database_options
@@ -13265,7 +13324,7 @@ do:
           {
             LEX *lex=Lex;
             lex->sql_command = SQLCOM_DO;
-            if (lex->main_select_push())
+            if (lex->main_select_push(true))
               MYSQL_YYABORT;
             mysql_init_select(lex);
           }
@@ -16453,7 +16512,7 @@ set:
           SET
           {
             LEX *lex=Lex;
-            if (lex->main_select_push())
+            if (lex->main_select_push(true))
               MYSQL_YYABORT;
             lex->set_stmt_init();
             lex->var_list.empty();

sql/sql_yacc_ora.yy

@@ -2311,8 +2311,6 @@ create:
           {
             Lex->create_info.default_table_charset= NULL;
             Lex->create_info.used_fields= 0;
-            if (Lex->main_select_push())
-              MYSQL_YYABORT;
           }
           opt_create_database_options
           {
@@ -2321,7 +2319,6 @@ create:
                          $1 | $3)))
                MYSQL_YYABORT;
             lex->name= $4;
-            Lex->pop_select(); //main select
           }
         | create_or_replace definer_opt opt_view_suid VIEW_SYM
           opt_if_not_exists table_ident
@@ -3547,10 +3544,13 @@ sp_cursor_stmt:
           {
             DBUG_ASSERT(thd->free_list == NULL);
             Lex->sphead->reset_lex(thd, $1);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
           }
           select
           {
             DBUG_ASSERT(Lex == $1);
+            Lex->pop_select(); //main select
             if (unlikely($1->stmt_finalize(thd)) ||
                 unlikely($1->sphead->restore_lex(thd)))
               MYSQL_YYABORT;
@@ -4061,6 +4061,11 @@ sp_proc_stmt_statement:
             Lex_input_stream *lip= YYLIP;
 
             lex->sphead->reset_lex(thd);
+            /*
+              We should not push main select here, it will be done or not
+              done by the statement, we just provide only new LEX for the
+              statement here as if it is start of parsing new statement.
+            */
             lex->sphead->m_tmp_query= lip->get_tok_start();
           }
           sp_statement
@@ -4079,11 +4084,16 @@ RETURN_ALLMODES_SYM:
 
 sp_proc_stmt_return:
           RETURN_ALLMODES_SYM
-          { Lex->sphead->reset_lex(thd); }
+          {
+            Lex->sphead->reset_lex(thd);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
+          }
           expr
           {
             LEX *lex= Lex;
             sp_head *sp= lex->sphead;
+            Lex->pop_select(); //main select
             if (unlikely(sp->m_handler->add_instr_freturn(thd, sp, lex->spcont,
                                                           $3, lex)) ||
                 unlikely(sp->restore_lex(thd)))
@@ -4100,9 +4110,16 @@ sp_proc_stmt_return:
         ;
 
 reset_lex_expr:
-          { Lex->sphead->reset_lex(thd); }
+          {
+            Lex->sphead->reset_lex(thd);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
+          }
           expr
-          { $$= $2; }
+          {
+            $$= $2;
+            Lex->pop_select(); //main select
+          }
         ;
 
 sp_proc_stmt_exit_oracle:
@@ -4201,6 +4218,8 @@ assignment_source_expr:
           {
             DBUG_ASSERT(thd->free_list == NULL);
             Lex->sphead->reset_lex(thd, $1);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
           }
           expr
           {
@@ -4209,6 +4228,7 @@ assignment_source_expr:
             $$->sp_lex_in_use= true;
             $$->set_item_and_free_list($3, thd->free_list);
             thd->free_list= NULL;
+            Lex->pop_select(); //main select
             if ($$->sphead->restore_lex(thd))
               MYSQL_YYABORT;
           }
@@ -4218,6 +4238,8 @@ for_loop_bound_expr:
           assignment_source_lex
           {
             Lex->sphead->reset_lex(thd, $1);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
             Lex->current_select->parsing_place= FOR_LOOP_BOUND;
           }
           expr
@@ -4226,6 +4248,7 @@ for_loop_bound_expr:
             $$= $1;
             $$->sp_lex_in_use= true;
             $$->set_item_and_free_list($3, NULL);
+            Lex->pop_select(); //main select
             if (unlikely($$->sphead->restore_lex(thd)))
               MYSQL_YYABORT;
             Lex->current_select->parsing_place= NO_MATTER;
@@ -4338,7 +4361,11 @@ sp_fetch_list:
         ;
 
 sp_if:
-          { Lex->sphead->reset_lex(thd); }
+          {
+            Lex->sphead->reset_lex(thd);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
+          }
           expr THEN_SYM
           {
             LEX *lex= Lex;
@@ -4352,6 +4379,7 @@ sp_if:
                 unlikely(sp->add_cont_backpatch(i)) ||
                 unlikely(sp->add_instr(i)))
               MYSQL_YYABORT;
+            Lex->pop_select(); //main select
             if (unlikely(sp->restore_lex(thd)))
               MYSQL_YYABORT;
           }
@@ -4452,12 +4480,17 @@ case_stmt_specification:
         ;
 
 case_stmt_body:
-          { Lex->sphead->reset_lex(thd); /* For expr $2 */ }
+          {
+            Lex->sphead->reset_lex(thd); /* For expr $2 */
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
+          }
           expr
           {
             if (unlikely(Lex->case_stmt_action_expr($2)))
               MYSQL_YYABORT;
 
+            Lex->pop_select(); //main select
             if (Lex->sphead->restore_lex(thd))
               MYSQL_YYABORT;
           }
@@ -4481,6 +4514,8 @@ simple_when_clause:
           WHEN_SYM
           {
             Lex->sphead->reset_lex(thd); /* For expr $3 */
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
           }
           expr
           {
@@ -4489,6 +4524,7 @@ simple_when_clause:
             LEX *lex= Lex;
             if (unlikely(lex->case_stmt_action_when($3, true)))
               MYSQL_YYABORT;
+            Lex->pop_select(); //main select
             /* For expr $3 */
             if (unlikely(lex->sphead->restore_lex(thd)))
               MYSQL_YYABORT;
@@ -4505,12 +4541,15 @@ searched_when_clause:
           WHEN_SYM
           {
             Lex->sphead->reset_lex(thd); /* For expr $3 */
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
           }
           expr
           {
             LEX *lex= Lex;
             if (unlikely(lex->case_stmt_action_when($3, false)))
               MYSQL_YYABORT;
+            Lex->pop_select(); //main select
             /* For expr $3 */
             if (unlikely(lex->sphead->restore_lex(thd)))
               MYSQL_YYABORT;
@@ -4699,9 +4738,15 @@ opt_sp_for_loop_direction:
         ;
 
 sp_for_loop_index_and_bounds:
-          ident_directly_assignable sp_for_loop_bounds
+          ident_directly_assignable
           {
-            if (unlikely(Lex->sp_for_loop_declarations(thd, &$$, &$1, $2)))
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
+          }
+          sp_for_loop_bounds
+          {
+            Lex->pop_select(); //main select
+            if (unlikely(Lex->sp_for_loop_declarations(thd, &$$, &$1, $3)))
               MYSQL_YYABORT;
           }
         ;
@@ -4747,8 +4792,11 @@ while_body:
             LEX *lex= Lex;
             if (unlikely(lex->sp_while_loop_expression(thd, $1)))
               MYSQL_YYABORT;
+            Lex->pop_select(); //main select
             if (lex->sphead->restore_lex(thd))
               MYSQL_YYABORT;
+            if (lex->main_select_push(true))
+               MYSQL_YYABORT;
           }
           sp_proc_stmts1 END LOOP_SYM
           {
@@ -4759,7 +4807,11 @@ while_body:
 
 repeat_body:
           sp_proc_stmts1 UNTIL_SYM 
-          { Lex->sphead->reset_lex(thd); }
+          {
+            Lex->sphead->reset_lex(thd);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
+          }
           expr END REPEAT_SYM
           {
             LEX *lex= Lex;
@@ -4770,6 +4822,7 @@ repeat_body:
             if (unlikely(i == NULL) ||
                 unlikely(lex->sphead->add_instr(i)))
               MYSQL_YYABORT;
+            Lex->pop_select(); //main select
             if (lex->sphead->restore_lex(thd))
               MYSQL_YYABORT;
             /* We can shortcut the cont_backpatch here */
@@ -4798,6 +4851,8 @@ sp_labeled_control:
             if (unlikely(Lex->sp_push_loop_label(thd, &$1)))
               MYSQL_YYABORT;
             Lex->sphead->reset_lex(thd);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
           }
           while_body pop_sp_loop_label
           { }
@@ -4849,6 +4904,8 @@ sp_unlabeled_control:
             if (unlikely(Lex->sp_push_loop_empty_label(thd)))
               MYSQL_YYABORT;
             Lex->sphead->reset_lex(thd);
+            if (Lex->main_select_push(true))
+              MYSQL_YYABORT;
           }
           while_body
           {
@@ -7914,7 +7971,7 @@ alter:
           {
             Lex->create_info.default_table_charset= NULL;
             Lex->create_info.used_fields= 0;
-            if (Lex->main_select_push())
+            if (Lex->main_select_push(true))
               MYSQL_YYABORT;
           }
           create_database_options
@@ -13372,7 +13429,7 @@ do:
           {
             LEX *lex=Lex;
             lex->sql_command = SQLCOM_DO;
-            if (lex->main_select_push())
+            if (lex->main_select_push(true))
               MYSQL_YYABORT;
             mysql_init_select(lex);
           }
@@ -16619,7 +16676,7 @@ set:
           SET
           {
             LEX *lex=Lex;
-            if (lex->main_select_push())
+            if (lex->main_select_push(true))
               MYSQL_YYABORT;
             lex->set_stmt_init();
             lex->var_list.empty();