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MDEV 22785 Crash with prepared statements and NEXTVAL()

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The problem was that a PREARE followed by a non prepared statement
using DEFAULT NEXT_VALUE() could change table->next_local to point to
a not persitent memory aria. The next EXECUTE would then try to use
the wrong pointer, which could cause a crash.
Fixed by reseting the pointer to it's old value when doing EXECUTE.
This commit is contained in:
Michael Widenius
2021-08-25 22:16:19 +03:00
parent c9851d35ad
commit b378ddb3d3
4 changed files with 38 additions and 6 deletions
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12
mysql-test/suite/sql_sequence/default.test
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@ -123,3 +123,15 @@ ALTER TABLE t1 add column c int;
ALTER TABLE t1 add column d int default next value for s_not_exits;
drop table t1;
drop sequence s1;
--echo #
--echo # MDEV 22785 Crash with prepared statements and NEXTVAL()
--echo #
CREATE SEQUENCE s;
CREATE TABLE t1 (id int NOT NULL DEFAULT NEXTVAL(s), PRIMARY KEY (id));
PREPARE stmt FROM " INSERT INTO t1 () values ()";
INSERT INTO t1 () values ();
EXECUTE stmt;
# Cleanup
DROP TABLE t1;
DROP SEQUENCE s;