Fixed bug#54375 - Error in stored procedure leaves connection

in different default schema.

In strict mode, when data truncation or conversion happens,
THD::killed is set to THD::KILL_BAD_DATA.

This is abuse of KILL mechanism to guarantee that execution
of statement is aborted.

The stored procedures execution, on the other hand,
upon detection that a connection was killed, would
terminate immediately, without trying to restore the caller's
context, in particular, restore the caller's current schema.

The fix is, when terminating a stored procedure execution,
to only bypass cleanup if the entire connection was killed,
not in case of other forms of KILL.

mysql-test/r/sp-bugs.result

@@ -73,4 +73,40 @@ CALL p1 ();
 ERROR HY000: Trigger does not exist
 DROP TABLE t1;
 DROP PROCEDURE p1;
+#
+# Bug#54375: Error in stored procedure leaves connection
+# in different default schema
+#
+SET @@SQL_MODE = 'STRICT_ALL_TABLES';
+DROP DATABASE IF EXISTS db1;
+CREATE DATABASE db1;
+USE db1;
+DROP TABLE IF EXISTS t1;
+CREATE TABLE t1 (c1 int NOT NULL PRIMARY KEY);
+INSERT INTO t1 VALUES (1);
+CREATE FUNCTION f1 (
+some_value int
+)
+RETURNS smallint
+DETERMINISTIC
+BEGIN
+INSERT INTO t1 SET c1 = some_value;
+RETURN(LAST_INSERT_ID());
+END$$
+DROP DATABASE IF EXISTS db2;
+CREATE DATABASE db2;
+USE db2;
+SELECT DATABASE();
+DATABASE()
+db2
+SELECT db1.f1(1);
+ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
+SELECT DATABASE();
+DATABASE()
+db2
+USE test;
+DROP FUNCTION db1.f1;
+DROP TABLE db1.t1;
+DROP DATABASE db1;
+DROP DATABASE db2;
 End of 5.1 tests

mysql-test/t/sp-bugs.test

@@ -101,4 +101,41 @@ CALL p1 ();
 DROP TABLE t1;
 DROP PROCEDURE p1;
 
+--echo #
+--echo # Bug#54375: Error in stored procedure leaves connection
+--echo # in different default schema
+--echo #
+
+--disable_warnings
+SET @@SQL_MODE = 'STRICT_ALL_TABLES';
+DROP DATABASE IF EXISTS db1;
+CREATE DATABASE db1;
+USE db1;
+DROP TABLE IF EXISTS t1;
+CREATE TABLE t1 (c1 int NOT NULL PRIMARY KEY);
+INSERT INTO t1 VALUES (1);
+DELIMITER $$;
+CREATE FUNCTION f1 (
+	some_value int
+)
+RETURNS smallint
+DETERMINISTIC
+BEGIN
+	INSERT INTO t1 SET c1 = some_value;
+        RETURN(LAST_INSERT_ID());
+END$$
+DELIMITER ;$$
+DROP DATABASE IF EXISTS db2;
+CREATE DATABASE db2;
+--enable_warnings
+USE db2;
+SELECT DATABASE();
+--error ER_DUP_ENTRY
+SELECT db1.f1(1);
+SELECT DATABASE();
+USE test;
+DROP FUNCTION db1.f1;
+DROP TABLE db1.t1;
+DROP DATABASE db1;
+DROP DATABASE db2;
 --echo End of 5.1 tests

sql/sp_head.cc

@@ -1372,7 +1372,7 @@ sp_head::execute(THD *thd)
     If the DB has changed, the pointer has changed too, but the
     original thd->db will then have been freed
   */
-  if (cur_db_changed && !thd->killed)
+  if (cur_db_changed && thd->killed != THD::KILL_CONNECTION)
   {
     /*
       Force switching back to the saved current database, because it may be