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MDEV-26583 SIGSEGV's in spider_get_select_limit_from_select_lex when DELAYED INSERT is used

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Spider dereferences a freed select_lex and then results in SIGSEGV.
This commit is contained in:
Nayuta Yanagisawa
2022-01-04 13:21:14 +09:00
parent e128d852e8
commit f8c3d59274
4 changed files with 86 additions and 0 deletions
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5
sql/sql_insert.cc
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@ -2423,6 +2423,11 @@ bool delayed_get_table(THD *thd, MDL_request *grl_protection_request,
di->table_list.alias.str= di->table_list.table_name.str= di->thd.query();
di->table_list.alias.length= di->table_list.table_name.length= di->thd.query_length();
di->table_list.db= di->thd.db;
/*
Nulify select_lex because, if the thread that spawned the current one
disconnects, the select_lex will point to freed memory.
*/
di->table_list.select_lex= NULL;
/*
We need the tickets so that they can be cloned in
handle_delayed_insert

34
storage/spider/mysql-test/spider/bugfix/r/mdev_26583.result Normal file
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@ -0,0 +1,34 @@
#
# MDEV-26583 SIGSEGV's in spider_get_select_limit_from_select_lex when DELAYED INSERT is used
#
for master_1
for child2
child2_1
child2_2
child2_3
for child3
connection child2_1;
CREATE DATABASE auto_test_remote;
USE auto_test_remote;
CREATE TABLE tbl_a (
a INT AUTO_INCREMENT KEY,
b INT,INDEX i (b)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
connection master_1;
CREATE DATABASE auto_test_local;
USE auto_test_local;
CREATE TABLE tbl_a (
a INT AUTO_INCREMENT KEY,
b INT,INDEX i (b)
) ENGINE=Spider DEFAULT CHARSET=utf8 COMMENT='srv "s_2_1", table "tbl_a"';
INSERT DELAYED INTO tbl_a VALUES (0,0),(0,0),(0,0);
connection master_1;
DROP DATABASE auto_test_local;
connection child2_1;
DROP DATABASE auto_test_remote;
for master_1
for child2
child2_1
child2_2
child2_3
for child3

3
storage/spider/mysql-test/spider/bugfix/t/mdev_26583.cnf Normal file
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@ -0,0 +1,3 @@
!include include/default_mysqld.cnf
!include ../my_1_1.cnf
!include ../my_2_1.cnf

44
storage/spider/mysql-test/spider/bugfix/t/mdev_26583.test Normal file
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@ -0,0 +1,44 @@
--echo #
--echo # MDEV-26583 SIGSEGV's in spider_get_select_limit_from_select_lex when DELAYED INSERT is used
--echo #
--disable_query_log
--disable_result_log
--source ../../t/test_init.inc
--enable_result_log
--enable_query_log
--connection child2_1
CREATE DATABASE auto_test_remote;
USE auto_test_remote;
eval CREATE TABLE tbl_a (
a INT AUTO_INCREMENT KEY,
b INT,INDEX i (b)
) $CHILD2_1_ENGINE $CHILD2_1_CHARSET;
--connection master_1
CREATE DATABASE auto_test_local;
USE auto_test_local;
eval CREATE TABLE tbl_a (
a INT AUTO_INCREMENT KEY,
b INT,INDEX i (b)
) $MASTER_1_ENGINE $MASTER_1_CHARSET COMMENT='srv "s_2_1", table "tbl_a"';
INSERT DELAYED INTO tbl_a VALUES (0,0),(0,0),(0,0);
let $wait_condition=select count(*)=3 from tbl_a
source include/wait_condition.inc;
--connection master_1
DROP DATABASE auto_test_local;
--connection child2_1
DROP DATABASE auto_test_remote;
--disable_query_log
--disable_result_log
--source ../../t/test_deinit.inc
--enable_result_log
--enable_query_log