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MDEV-32025 Crashes in MDL_key::mdl_key_init with lower-case-table-names=2

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Backporting a part of MDEV-32026 (which also fixed MDEV-32025 in 11.3)
from 11.3 to 10.4.

The reported crash happened with --lower-case-table-names=2
on statements like:

ALTER DATABASE Db1 DEFAULT CHARACTER SET utf8;
ALTER DATABASE `#mysql50#D+b1` UPGRADE DATA DIRECTORY NAME;

lock_schema_name() expects a normalized database name
and assert if a non-normalized name comes.

mysql_alter_db_internal() and mysql_upgrade_db() get
a non-normalized database name in the parameter.
Fixing them to normalize the database name before passing
it to lock_schema_name().
This commit is contained in:
Alexander Barkov
2023-09-04 14:12:12 +04:00
parent e913f4e11e
commit 179424db5f
3 changed files with 47 additions and 3 deletions
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21
mysql-test/main/lowercase_table2.result Normal file → Executable file
View File

@ -358,3 +358,24 @@ disconnect conn1;
drop user 'mysqltest_1'@'localhost';
drop tables a, B;
drop database db1;
#
# MDEV-32025 Crashes in MDL_key::mdl_key_init with lower-case-table-names=2
#
CREATE DATABASE `#mysql50#D+b1`;
ALTER DATABASE `#mysql50#D+b1` UPGRADE DATA DIRECTORY NAME;
SHOW CREATE DATABASE `D+b1`;
Database Create Database
D+b1 CREATE DATABASE `D+b1` /*!40100 DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci */
SHOW CREATE DATABASE `d+b1`;
Database Create Database
d+b1 CREATE DATABASE `d+b1` /*!40100 DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci */
DROP DATABASE `D+b1`;
CREATE DATABASE Db1;
ALTER DATABASE Db1 DEFAULT CHARACTER SET utf8;
SHOW CREATE DATABASE Db1;
Database Create Database
Db1 CREATE DATABASE `Db1` /*!40100 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci */
SHOW CREATE DATABASE db1;
Database Create Database
db1 CREATE DATABASE `db1` /*!40100 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci */
DROP DATABASE Db1;

18
mysql-test/main/lowercase_table2.test
View File

@ -313,4 +313,20 @@ connection default;
disconnect conn1;
drop user 'mysqltest_1'@'localhost';
drop tables a, B;
drop database db1;
drop database db1;
--echo #
--echo # MDEV-32025 Crashes in MDL_key::mdl_key_init with lower-case-table-names=2
--echo #
CREATE DATABASE `#mysql50#D+b1`;
ALTER DATABASE `#mysql50#D+b1` UPGRADE DATA DIRECTORY NAME;
SHOW CREATE DATABASE `D+b1`;
SHOW CREATE DATABASE `d+b1`;
DROP DATABASE `D+b1`;
CREATE DATABASE Db1;
ALTER DATABASE Db1 DEFAULT CHARACTER SET utf8;
SHOW CREATE DATABASE Db1;
SHOW CREATE DATABASE db1;
DROP DATABASE Db1;

11
sql/sql_db.cc
View File

@ -715,7 +715,10 @@ mysql_alter_db_internal(THD *thd, const LEX_CSTRING *db,
int error= 0;
DBUG_ENTER("mysql_alter_db");
if (lock_schema_name(thd, db->str))
char dbnorm_buffer[SAFE_NAME_LEN + 1];
const char *dbnorm= normalize_db_name(db->str, dbnorm_buffer,
sizeof(dbnorm_buffer));
if (lock_schema_name(thd, dbnorm))
DBUG_RETURN(TRUE);
/*
@ -1686,8 +1689,12 @@ bool mysql_upgrade_db(THD *thd, const LEX_CSTRING *old_db)
new_db.str= old_db->str + MYSQL50_TABLE_NAME_PREFIX_LENGTH;
new_db.length= old_db->length - MYSQL50_TABLE_NAME_PREFIX_LENGTH;
char dbnorm_buffer_old[SAFE_NAME_LEN + 1];
const char *old_dbnorm= normalize_db_name(old_db->str, dbnorm_buffer_old,
sizeof(dbnorm_buffer_old));
/* Lock the old name, the new name will be locked by mysql_create_db().*/
if (lock_schema_name(thd, old_db->str))
if (lock_schema_name(thd, old_dbnorm))
DBUG_RETURN(1);
/*