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Fix for bug#49897: crash in ptr_compare when char(0) NOT NULL

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column is used for ORDER BY

Problem: filesort isn't meant for null length sort data
(e.g. char(0)), that leads to a server crash.

Fix: disregard sort order if sort data record length is 0 (nothing
to sort).


mysql-test/r/select.result:
  Fix for bug#49897: crash in ptr_compare when char(0) NOT NULL 
  column is used for ORDER BY
    - test result.
mysql-test/t/select.test:
  Fix for bug#49897: crash in ptr_compare when char(0) NOT NULL 
  column is used for ORDER BY
    - test case.
sql/filesort.cc:
  Fix for bug#49897: crash in ptr_compare when char(0) NOT NULL 
  column is used for ORDER BY
    - assert added as filesort cannot handle null length sort data.
sql/sql_select.cc:
  Fix for bug#49897: crash in ptr_compare when char(0) NOT NULL 
  column is used for ORDER BY
    - don't sort null length data e.g. in case of ORDER BY CHAR(0).
This commit is contained in:
Ramil Kalimullin
2010-01-29 13:17:57 +04:00
parent b13ed2975d
commit 172af3722e
4 changed files with 119 additions and 0 deletions
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64
mysql-test/r/select.result
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@ -4540,4 +4540,68 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE z system NULL NULL NULL NULL 1
Warnings:
Note 1003 select '2001-01-01 00:00:00' AS `a`,'2001-01-01 00:00:00' AS `a`,'2001-01-01 00:00:00' AS `a` from `test`.`t1` `x` join `test`.`t1` `y` join `test`.`t1` `z` where 1
DROP TABLE t1;
#
# Bug #49897: crash in ptr_compare when char(0) NOT NULL
# column is used for ORDER BY
#
SET @old_sort_buffer_size= @@session.sort_buffer_size;
SET @@sort_buffer_size= 40000;
CREATE TABLE t1(a CHAR(0) NOT NULL);
INSERT INTO t1 VALUES (0), (0), (0);
INSERT INTO t1 SELECT t11.a FROM t1 t11, t1 t12;
INSERT INTO t1 SELECT t11.a FROM t1 t11, t1 t12;
INSERT INTO t1 SELECT t11.a FROM t1 t11, t1 t12;
EXPLAIN SELECT a FROM t1 ORDER BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 24492
SELECT a FROM t1 ORDER BY a;
DROP TABLE t1;
CREATE TABLE t1(a CHAR(0) NOT NULL, b CHAR(0) NOT NULL, c int);
INSERT INTO t1 VALUES (0, 0, 0), (0, 0, 2), (0, 0, 1);
INSERT INTO t1 SELECT t11.a, t11.b, t11.c FROM t1 t11, t1 t12;
INSERT INTO t1 SELECT t11.a, t11.b, t11.c FROM t1 t11, t1 t12;
INSERT INTO t1 SELECT t11.a, t11.b, t11.c FROM t1 t11, t1 t12;
EXPLAIN SELECT a FROM t1 ORDER BY a LIMIT 5;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 24492
SELECT a FROM t1 ORDER BY a LIMIT 5;
a
EXPLAIN SELECT * FROM t1 ORDER BY a, b LIMIT 5;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 24492
SELECT * FROM t1 ORDER BY a, b LIMIT 5;
a b c
0
2
1
0
2
EXPLAIN SELECT * FROM t1 ORDER BY a, b, c LIMIT 5;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 24492 Using filesort
SELECT * FROM t1 ORDER BY a, b, c LIMIT 5;
a b c
0
0
0
0
0
EXPLAIN SELECT * FROM t1 ORDER BY c, a LIMIT 5;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 24492 Using filesort
SELECT * FROM t1 ORDER BY c, a LIMIT 5;
a b c
0
0
0
0
0
SET @@sort_buffer_size= @old_sort_buffer_size;
DROP TABLE t1;
End of 5.0 tests