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Bug#13002783 PARTIALLY UNINITIALIZED CASCADE UPDATE VECTOR

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In the ON UPDATE CASCADE clause of FOREIGN KEY constraints, the
calculated update vector was not fully initialized. This bug was
introduced in the InnoDB Plugin when implementing support for
ROW_FORMAT=DYNAMIC.

Additionally, the data type information was not initialized, but
apparently it has never been needed in this case.  Nevertheless, it is
not good programming practice to pass uninitialized values around.

calc_row_difference(): Declare the update field uninitialized in
Valgrind. Copy the data type information as well, except when the
field is SQL NULL. In the built-in InnoDB, initialize
ufield->extern_storage = FALSE (an initialization bug that had gone
unnoticed this far). The InnoDB Plugin and later have this flag to
dfield_t and have always initialized it properly.

row_ins_cascade_calc_update_vec(): Reduce the scope of some
pointers. Initialize orig_len. (This caused the bug in InnoDB Plugin
and later.)

row_ins_foreign_check_on_constraint(): Simplify a condition. Declare
the update vector uninitialized.

rb:771 approved by Jimmy Yang
This commit is contained in:
Marko Mäkelä
2011-10-25 17:33:38 +03:00
parent dce337406e
commit 013ba71dfd
9 changed files with 102 additions and 24 deletions
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16
mysql-test/suite/innodb/r/innodb.result
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@ -1293,6 +1293,20 @@ ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fail
update t3 set t3.id=7 where t1.id =1 and t2.id = t1.id and t3.id = t2.id;
ERROR 42S22: Unknown column 't1.id' in 'where clause'
drop table t3,t2,t1;
CREATE TABLE t1 (
c1 VARCHAR(8), c2 VARCHAR(8),
PRIMARY KEY (c1, c2)
) ENGINE=InnoDB;
CREATE TABLE t2 (
c0 INT PRIMARY KEY,
c1 VARCHAR(8) UNIQUE,
FOREIGN KEY (c1) REFERENCES t1 (c1) ON UPDATE CASCADE
) ENGINE=InnoDB;
INSERT INTO t1 VALUES ('old', 'somevalu'), ('other', 'anyvalue');
INSERT INTO t2 VALUES (10, 'old'), (20, 'other');
UPDATE t1 SET c1 = 'other' WHERE c1 = 'old';
ERROR 23000: Upholding foreign key constraints for table 't1', entry '', key 2 would lead to a duplicate entry
DROP TABLE t2,t1;
create table t1(
id int primary key,
pid int,
@ -1671,7 +1685,7 @@ variable_value - @innodb_rows_deleted_orig
71
SELECT variable_value - @innodb_rows_inserted_orig FROM information_schema.global_status WHERE LOWER(variable_name) = 'innodb_rows_inserted';
variable_value - @innodb_rows_inserted_orig
1063
1067
SELECT variable_value - @innodb_rows_updated_orig FROM information_schema.global_status WHERE LOWER(variable_name) = 'innodb_rows_updated';
variable_value - @innodb_rows_updated_orig
865