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MDEV-35852 : ASAN heap-use-after-free in WSREP_DEBUG after INSERT DELAYED

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Problem was that in case of INSERT DELAYED thd->query() is
freed before we call trans_rollback where WSREP_DEBUG
could access thd->query() in wsrep_thd_query().

Fix is to reset thd->query() to NULL in delayed_insert
destructor after it is freed. There is already
null guard at wsrep_thd_query().

Signed-off-by: Julius Goryavsky <julius.goryavsky@mariadb.com>
This commit is contained in:
Jan Lindström 2025-01-15 09:44:30 +02:00 committed by Julius Goryavsky
parent cbb24d9aa5
commit 43c36b3c88
6 changed files with 33 additions and 6 deletions
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8
mysql-test/suite/galera/r/MDEV-35852.result Normal file
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@ -0,0 +1,8 @@
connection node_2;
connection node_1;
CREATE TABLE t (a INT) ENGINE=InnoDB;
INSERT DELAYED INTO t VALUES ();
ERROR HY000: DELAYED option not supported for table 't'
DROP TABLE t;
INSERT DELAYED t1 () VALUES ();
ERROR 42S02: Table 'test.t1' doesn't exist

4
mysql-test/suite/galera/t/MDEV-35852.cnf Normal file
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@ -0,0 +1,4 @@
!include ../galera_2nodes.cnf
[mysqld]
wsrep-debug=1

9
mysql-test/suite/galera/t/MDEV-35852.test Normal file
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@ -0,0 +1,9 @@
--source include/galera_cluster.inc
CREATE TABLE t (a INT) ENGINE=InnoDB;
--error ER_DELAYED_NOT_SUPPORTED
INSERT DELAYED INTO t VALUES ();
DROP TABLE t;
--error ER_NO_SUCH_TABLE
INSERT DELAYED t1 () VALUES ();

13
sql/handler.cc
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@ -2158,8 +2158,10 @@ int ha_rollback_trans(THD *thd, bool all)
my_error(ER_ERROR_DURING_ROLLBACK, MYF(0), err); my_error(ER_ERROR_DURING_ROLLBACK, MYF(0), err);
error=1; error=1;
#ifdef WITH_WSREP #ifdef WITH_WSREP
WSREP_WARN("handlerton rollback failed, thd %lld %lld conf %d SQL %s", WSREP_WARN("handlerton rollback failed, thd %lld %lld "
"conf %d wsrep_err %s SQL %s",
thd->thread_id, thd->query_id, thd->wsrep_trx().state(), thd->thread_id, thd->query_id, thd->wsrep_trx().state(),
wsrep::to_c_string(thd->wsrep_cs().current_error()),
thd->query()); thd->query());
#endif /* WITH_WSREP */ #endif /* WITH_WSREP */
} }
@ -2172,11 +2174,12 @@ int ha_rollback_trans(THD *thd, bool all)
} }
#ifdef WITH_WSREP #ifdef WITH_WSREP
if (thd->is_error()) if (WSREP(thd) && thd->is_error())
{ {
WSREP_DEBUG("ha_rollback_trans(%lld, %s) rolled back: %s: %s; is_real %d", WSREP_DEBUG("ha_rollback_trans(%lld, %s) rolled back: msg %s is_real %d wsrep_err %s",
thd->thread_id, all?"TRUE":"FALSE", wsrep_thd_query(thd), thd->thread_id, all? "TRUE" : "FALSE",
thd->get_stmt_da()->message(), is_real_trans); thd->get_stmt_da()->message(), is_real_trans,
wsrep::to_c_string(thd->wsrep_cs().current_error()));
} }
// REPLACE|INSERT INTO ... SELECT uses TOI in consistency check // REPLACE|INSERT INTO ... SELECT uses TOI in consistency check

4
sql/service_wsrep.cc
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@ -1,4 +1,4 @@
/* Copyright 2018-2024 Codership Oy <info@codership.com> /* Copyright 2018-2025 Codership Oy <info@codership.com>
This program is free software; you can redistribute it and/or modify This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by it under the terms of the GNU General Public License as published by
@ -86,8 +86,10 @@ extern "C" const char *wsrep_thd_query(const THD *thd)
return "SET PASSWORD"; return "SET PASSWORD";
/* fallthrough */ /* fallthrough */
default: default:
{
return (thd->query() ? thd->query() : "NULL"); return (thd->query() ? thd->query() : "NULL");
} }
}
return "NULL"; return "NULL";
} }

1
sql/sql_insert.cc
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@ -2421,6 +2421,7 @@ public:
delayed_insert_threads--; delayed_insert_threads--;
my_free(thd.query()); my_free(thd.query());
thd.reset_query_inner();
thd.security_ctx->user= 0; thd.security_ctx->user= 0;
thd.security_ctx->host= 0; thd.security_ctx->host= 0;
} }