cmp_item_sort_string::cmp() wasn't checking values_res variable for null.
Later called function was dereferenced it and crashed server.

Added null check to cmp_item_sort_string::cmp().

Changed variable type and added comment in sp.c.

into  mysql.com:/usr/home/pem/bug14233/mysql-5.0

into  mysql.com:/home/stewart/Documents/MySQL/5.0/bug15512

into mysql.com:/M50/mysql-5.0

into  mysql.com:/home/matthias/Arbeit/mysql-5.0/src-Z

Solution according to the comments made by Guilhem
- rpl_relayrotate  Remove the SHOW SLAVE STATUS  It is not needed.
- rpl_until, rpl_deadlock Omit the printing of the "Slave_IO_Running" value

(Backport of an identical change from 5.0)

into mysql.com:/M50/mysql-5.0

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0

  is not defined.

into  a193-229-222-105.elisa-laajakaista.fi:/home/my/bk/mysql-5.0

into  a193-229-222-105.elisa-laajakaista.fi:/home/my/bk/mysql-4.1

  Make __cxa_pure_virtual weak symbol

into mysql.com:/Users/kent/mysql/bk/mysql-5.0

into  devsrv-b.mysql.com:/space/magnus/my50-bug11731

into  sanja.is.com.ua:/home/bell/mysql/bk/work-merge1-5.0

into  devsrv-b.mysql.com:/space/magnus/my50-bug11731

 used instead of column", the bug is to be fixed later.

into  sanja.is.com.ua:/home/bell/mysql/bk/work-merge1-5.0

of SELECT from query begining, to be independet of query buffer
allocation.
Correct procedure used to find beginning of the current statement
during parsing (BUG#14885).

into  sanja.is.com.ua:/home/bell/mysql/bk/work-merge1-5.0

  After merge fix

into  devsrv-b.mysql.com:/space/magnus/my50-bug11731

 - Add tests to mysqltest.test
 - Problem no longer exists 

into moonbone.local:/work/15028-bug-4.1-mysql

into  mysql.com:/usr/home/pem/bug14376/mysql-5.0

into  sanja.is.com.ua:/home/bell/mysql/bk/work-merge1-5.0

into  mysql.com:/usr/home/ram/work/5.0.b12956

into  sanja.is.com.ua:/home/bell/mysql/bk/work-merge1-5.0