Bug #13445 Partitions: crash if key method

Description:
If I use the KEY method of partitioning, and I
have a multi-column key, and I have a few rows
in the table, then SELECT causes a crash.

How to repeat:
mysql> create table tw (s1 int, s2 int, primary key (s1,s2)) engine=innodb partition by key (s2,s1) partitions 4;
Query OK, 0 rows affected (0.02 sec)

mysql> insert into tw values (0,0),(1,1),(2,2),(3,3),(4,4),(5,5),(6,6);
Query OK, 7 rows affected (0.01 sec)
Records: 7  Duplicates: 0  Warnings: 0

mysql> select * from tw where s1 = 4;
ERROR 2013 (HY000): Lost connection to MySQL server during query

Small lapse in get_partition_set

Patch pushed and will appear in 5.1.6

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Additional info:

Documented bugfix in 5.1.6 changelog. Closed.