federated use-after-free with temp tables and savepoints

INSTALL SONAME 'ha_federatedx';

eval CREATE SERVER srv FOREIGN DATA WRAPPER mysql OPTIONS (USER 'root', HOST '127.0.0.1', DATABASE 'test', PORT $MASTER_MYPORT);

CREATE TABLE t1 (c INT) ENGINE=MyISAM;

CREATE TABLE t2 (c INT) CONNECTION='srv/t1' ENGINE=Federated;

XA START 'a';

CREATE TEMPORARY TABLE  t2 (c INT) CONNECTION='srv/t1' ENGINE=Federated;

INSERT INTO t2 VALUES (0);

SAVEPOINT sp;

RELEASE SAVEPOINT sp;

xa end 'a';

xa prepare 'a';

xa commit 'a';

drop table t1, t2;

drop table t2;

uninstall soname 'ha_federatedx';