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Bug#12699505 Memory leak in row_create_index_for_mysql()

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DB_COL_APPEARS_TWICE_IN_INDEX: Remove. This condition is already
checked and reported by MySQL before passing the index definition to
the storage engine.

row_create_index_for_mysql(): Remove the redundant check for
DB_COL_APPEARS_TWICE_IN_INDEX. When enforcing the column prefix index
limit, invoke dict_mem_index_free(index) to plug the memory leak. In
the loop, use index->n_def instead of dict_index_get_n_fields(index),
because the latter would be 0 for indexes that have not been copied to
the data dictionary cache.

innodb-use-sys-malloc.test:

Add test cases for attempting to trigger the error checks in
row_create_index_for_mysql(). Before MySQL 5.5 and WL#5743, the leak
is only reproducible if ha_innobase::max_supported_key_part_length()
returned a higher limit than the one used in
row_create_index_for_mysql().

In MySQL 5.5 and later, the leak is reproducible with
innodb_large_prefix=true.

rb:688 approved by Jimmy Yang
This commit is contained in:
Marko Mäkelä 2011-06-28 15:28:21 +03:00
parent e232ed0990
commit 37282cc6bd
7 changed files with 75 additions and 106 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

75
mysql-test/suite/innodb/r/innodb-use-sys-malloc.result
View file

@ -9,40 +9,45 @@ SELECT @@GLOBAL.innodb_use_sys_malloc;
@@GLOBAL.innodb_use_sys_malloc
1
1 Expected
drop table if exists t1;
create table t1(a int not null) engine=innodb DEFAULT CHARSET=latin1;
insert into t1 values (1),(2),(3),(4),(5),(6),(7);
create table t1(a int not null,key(a,a)) engine=innodb DEFAULT CHARSET=latin1;
ERROR 42S21: Duplicate column name 'a'
create table t1(a int,b text,key(b(768))) engine=innodb DEFAULT CHARSET=latin1;
ERROR HY000: Index column size too large. The maximum column size is 767 bytes.
create table t1(a int not null,b text) engine=innodb DEFAULT CHARSET=latin1;
insert into t1 values (1,''),(2,''),(3,''),(4,''),(5,''),(6,''),(7,'');
create index t1aa on t1(a,a);
ERROR 42S21: Duplicate column name 'a'
create index t1b on t1(b(768));
ERROR HY000: Index column size too large. The maximum column size is 767 bytes.
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) NOT NULL,
`b` text
) ENGINE=InnoDB DEFAULT CHARSET=latin1
select * from t1;
a
1
2
3
4
5
6
7
drop table t1;
SELECT @@GLOBAL.innodb_use_sys_malloc;
@@GLOBAL.innodb_use_sys_malloc
1
1 Expected
SET @@GLOBAL.innodb_use_sys_malloc=0;
ERROR HY000: Variable 'innodb_use_sys_malloc' is a read only variable
Expected error 'Read only variable'
SELECT @@GLOBAL.innodb_use_sys_malloc;
@@GLOBAL.innodb_use_sys_malloc
1
1 Expected
drop table if exists t1;
create table t1(a int not null) engine=innodb DEFAULT CHARSET=latin1;
insert into t1 values (1),(2),(3),(4),(5),(6),(7);
select * from t1;
a
1
2
3
4
5
6
7
a b
1
2
3
4
5
6
7
drop table t1;
CREATE TABLE t2(a int primary key, b text) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO t2 VALUES (1,''),(2,''),(3,''),(4,''),(5,''),(6,''),(7,'');
CREATE INDEX t2aa on t2(a,a);
ERROR 42S21: Duplicate column name 'a'
CREATE INDEX t2b on t2(b(768));
ERROR HY000: Index column size too large. The maximum column size is 767 bytes.
SELECT * FROM t2;
a b
1
2
3
4
5
6
7
DROP TABLE t2;

5
mysql-test/suite/innodb/t/innodb-use-sys-malloc-master.opt
View file

@ -1,3 +1,2 @@
--default-storage-engine=MyISAM
--loose-innodb-use-sys-malloc=true
--loose-innodb-use-sys-malloc=true
--innodb-use-sys-malloc=true
--innodb-large-prefix=true

59
mysql-test/suite/innodb/t/innodb-use-sys-malloc.test
View file

@ -1,4 +1,4 @@
--source include/have_innodb.inc
-- source include/have_innodb.inc
#display current value of innodb_use_sys_malloc
SELECT @@GLOBAL.innodb_use_sys_malloc;
@ -13,36 +13,33 @@ SELECT @@GLOBAL.innodb_use_sys_malloc;
--echo 1 Expected
#do some stuff to see if it works.
--disable_warnings
drop table if exists t1;
--enable_warnings
# Do some stuff to see if it works.
# Also, test the code paths of
# Bug #12699505 MEMORY LEAK IN ROW_CREATE_INDEX_FOR_MYSQL()
# (the leak would only be triggered if
# ha_innobase::max_supported_key_part_length() were set
# higher than the limit used in row_create_index_for_mysql())
create table t1(a int not null) engine=innodb DEFAULT CHARSET=latin1;
insert into t1 values (1),(2),(3),(4),(5),(6),(7);
select * from t1;
drop table t1;
--source include/have_innodb.inc
#display current value of innodb_use_sys_malloc
SELECT @@GLOBAL.innodb_use_sys_malloc;
--echo 1 Expected
#try changing it. Should fail.
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
SET @@GLOBAL.innodb_use_sys_malloc=0;
--echo Expected error 'Read only variable'
SELECT @@GLOBAL.innodb_use_sys_malloc;
--echo 1 Expected
#do some stuff to see if it works.
--disable_warnings
drop table if exists t1;
--enable_warnings
create table t1(a int not null) engine=innodb DEFAULT CHARSET=latin1;
insert into t1 values (1),(2),(3),(4),(5),(6),(7);
--error ER_DUP_FIELDNAME
create table t1(a int not null,key(a,a)) engine=innodb DEFAULT CHARSET=latin1;
# thanks to --innodb-large-prefix=1 this will not be truncated to b(767)
-- error ER_INDEX_COLUMN_TOO_LONG
create table t1(a int,b text,key(b(768))) engine=innodb DEFAULT CHARSET=latin1;
create table t1(a int not null,b text) engine=innodb DEFAULT CHARSET=latin1;
insert into t1 values (1,''),(2,''),(3,''),(4,''),(5,''),(6,''),(7,'');
--error ER_DUP_FIELDNAME
create index t1aa on t1(a,a);
-- error ER_INDEX_COLUMN_TOO_LONG
create index t1b on t1(b(768));
SHOW CREATE TABLE t1;
select * from t1;
drop table t1;
CREATE TABLE t2(a int primary key, b text) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO t2 VALUES (1,''),(2,''),(3,''),(4,''),(5,''),(6,''),(7,'');
--error ER_DUP_FIELDNAME
CREATE INDEX t2aa on t2(a,a);
-- error ER_INDEX_COLUMN_TOO_LONG
CREATE INDEX t2b on t2(b(768));
SELECT * FROM t2;
DROP TABLE t2;

1
storage/innobase/handler/ha_innodb.cc
View file

@ -990,7 +990,6 @@ convert_error_code_to_mysql(
misleading, a new MySQL error
code should be introduced */
case DB_COL_APPEARS_TWICE_IN_INDEX:
case DB_CORRUPTION:
return(HA_ERR_CRASHED);

2
storage/innobase/include/db0err.h
View file

@ -64,8 +64,6 @@ enum db_err {
DB_CANNOT_ADD_CONSTRAINT, /* adding a foreign key constraint
to a table failed */
DB_CORRUPTION, /* data structure corruption noticed */
DB_COL_APPEARS_TWICE_IN_INDEX, /* InnoDB cannot handle an index
where same column appears twice */
DB_CANNOT_DROP_CONSTRAINT, /* dropping a foreign key constraint
from a table failed */
DB_NO_SAVEPOINT, /* no savepoint exists with the given

37
storage/innobase/row/row0mysql.c
View file

@ -2015,41 +2015,13 @@ row_create_index_for_mysql(
trx_start_if_not_started(trx);
/* Check that the same column does not appear twice in the index.
Starting from 4.0.14, InnoDB should be able to cope with that, but
safer not to allow them. */
for (i = 0; i < dict_index_get_n_fields(index); i++) {
ulint j;
for (j = 0; j < i; j++) {
if (0 == ut_strcmp(
dict_index_get_nth_field(index, j)->name,
dict_index_get_nth_field(index, i)->name)) {
ut_print_timestamp(stderr);
fputs(" InnoDB: Error: column ", stderr);
ut_print_name(stderr, trx, FALSE,
dict_index_get_nth_field(
index, i)->name);
fputs(" appears twice in ", stderr);
dict_index_name_print(stderr, trx, index);
fputs("\n"
"InnoDB: This is not allowed"
" in InnoDB.\n", stderr);
err = DB_COL_APPEARS_TWICE_IN_INDEX;
goto error_handling;
}
}
/* Check also that prefix_len and actual length
is less than that from DICT_MAX_FIELD_LEN_BY_FORMAT() */
for (i = 0; i < index->n_def; i++) {
/* Check that prefix_len and actual length
< DICT_MAX_INDEX_COL_LEN */
len = dict_index_get_nth_field(index, i)->prefix_len;
if (field_lengths) {
if (field_lengths && field_lengths[i]) {
len = ut_max(len, field_lengths[i]);
}
@ -2057,6 +2029,7 @@ row_create_index_for_mysql(
if (len > (ulint) DICT_MAX_FIELD_LEN_BY_FORMAT(table)) {
err = DB_TOO_BIG_INDEX_COL;
dict_mem_index_free(index);
goto error_handling;
}
}

2
storage/innobase/ut/ut0ut.c
View file

@ -674,8 +674,6 @@ ut_strerr(
return("Cannot add constraint");
case DB_CORRUPTION:
return("Data structure corruption");
case DB_COL_APPEARS_TWICE_IN_INDEX:
return("Column appears twice in index");
case DB_CANNOT_DROP_CONSTRAINT:
return("Cannot drop constraint");
case DB_NO_SAVEPOINT: