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MDEV-7820 Server crashes in in my_strcasecmp_utf8 on subquery in ORDER BY clause of GROUP_CONCAT

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It is possible for Item_field to have a NULL field_name. This is true if
the Item_field is created based on a field in a temporary table that has
no name. It is thus necessary to do a null check before attempting a
strcmp.
This commit is contained in:
Vicențiu Ciorbaru 2015-04-15 16:23:43 +03:00
parent cc84ac3be4
commit eb47b226d2
3 changed files with 31 additions and 1 deletions
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12
mysql-test/r/func_gconcat.result
View File

@ -1091,3 +1091,15 @@ insert into t1 values ('a'),('b');
select 1 from t1 where a in (select group_concat(a) from t1);
1
drop table t1;
CREATE TABLE t1 (f1 VARCHAR(10)) ENGINE=MyISAM;
INSERT INTO t1 VALUES ('a'),('b');
CREATE TABLE t2 (f2 VARCHAR(10)) ENGINE=MyISAM;
INSERT INTO t2 VALUES ('c');
CREATE TABLE t3 (f3 VARCHAR(10)) ENGINE=MyISAM;
INSERT INTO t3 VALUES ('d'),('e');
SELECT GROUP_CONCAT( f2 ORDER BY ( f2 IN ( SELECT f1 FROM t1 WHERE f1 <= f2 ) ) ) AS field
FROM ( SELECT * FROM t2 ) AS sq2, t3
ORDER BY field;
field
c,c
drop table t3, t2, t1;

18
mysql-test/t/func_gconcat.test
View File

@ -803,3 +803,21 @@ create table t1 (a char(1) character set utf8);
insert into t1 values ('a'),('b');
select 1 from t1 where a in (select group_concat(a) from t1);
drop table t1;
#
# MDEV-7820 Server crashes in in my_strcasecmp_utf8 on subquery in ORDER BY clause of GROUP_CONCAT
#
CREATE TABLE t1 (f1 VARCHAR(10)) ENGINE=MyISAM;
INSERT INTO t1 VALUES ('a'),('b');
CREATE TABLE t2 (f2 VARCHAR(10)) ENGINE=MyISAM;
INSERT INTO t2 VALUES ('c');
CREATE TABLE t3 (f3 VARCHAR(10)) ENGINE=MyISAM;
INSERT INTO t3 VALUES ('d'),('e');
SELECT GROUP_CONCAT( f2 ORDER BY ( f2 IN ( SELECT f1 FROM t1 WHERE f1 <= f2 ) ) ) AS field
FROM ( SELECT * FROM t2 ) AS sq2, t3
ORDER BY field;
drop table t3, t2, t1;

2
sql/sql_base.cc
View File

@ -7256,7 +7256,7 @@ find_item_in_list(Item *find, List<Item> &items, uint *counter,
Item_field for tables.
*/
Item_ident *item_ref= (Item_ident *) item;
if (item_ref->name && item_ref->table_name &&
if (field_name && item_ref->name && item_ref->table_name &&
!my_strcasecmp(system_charset_info, item_ref->name, field_name) &&
!my_strcasecmp(table_alias_charset, item_ref->table_name,
table_name) &&