Bug #8771 crashes when the ucs2 text value is NULL
Submitted: 24 Feb 2005 10:32 Modified: 2 Mar 2005 13:23
Reporter: [ name withheld ]
Status: Closed
Category:Server: InnoDB Severity:S1 (Critical)
Version:4.1.10 OS:Any (any)
Assigned to: Marko Mäkelä Target Version:

[24 Feb 2005 10:32] [ name withheld ] 
Description:
If the character-set of the text field is ucs2, and the value is NULL,
mysqld crashes when SELECT command was executed.

I'm using InnoDB.
This issue doesn't appear in 4.1.9.

How to repeat:
CREATE DATABASE testdb CHARACTER SET ucs2;
USE testdb;
CREATE TABLE table1 (
	id		INT		NOT NULL,
	data		MEDIUMTEXT	    NULL,
	PRIMARY KEY (id)
	);

INSERT INTO table1 VALUES (1, NULL);

/* Everything above is OK. but the next line causes crash. */

SELECT * FROM table1;
[24 Feb 2005 10:45] Hartmut Holzgraefe 
Works fine on Linux, seems to be a Windows only problem?
[24 Feb 2005 10:51] Victoria Reznichenko 
Verified with 4.1.11-debug-log
[24 Feb 2005 20:36] Marko Mäkelä 
Victoria,
Please, always post a stack trace when InnoDB is involved. I fixed some bugs in the UCS2
handling of InnoDB some time ago. Does this bug occur with ENGINE=MyISAM?
[28 Feb 2005 15:44] Marko Mäkelä 
It is an InnoDB assertion failure. When a NULL BLOB record is converted from InnoDB to
MySQL, the area reserved for it should not be padded with spaces (the two bytes 0x00 0x20
in UCS2) but with zero bytes. I'll adjust the "if" condition.
[2 Mar 2005 13:23] Marko Mäkelä 
Thank you for your bug report. This issue has been committed to our
source repository of that product and will be incorporated into the
next release.

If necessary, you can access the source repository and build the latest
available version, including the bugfix, yourself. More information 
about accessing the source trees is available at
    http://www.mysql.com/doc/en/Installing_source_tree.html

Additional info:

I pushed the fix to the 4.1 source tree yesterday, and I just merged it to the 5.0 tree.
The fix should be included in 4.1.11 and 5.0.3.