Bug #14365 Partitions: crash if value too small

Description:
I have a table with LIST partitions.
If I insert a value that's in the list, okay.
If I insert a value that's greater than anything in the list, error -- which is okay.
If I insert a value that's smaller than anything in the list, crash.

How to repeat:
mysql> create table t28 (s1 int) partition by list (s1) (partition p1 values in (2),partition p2 values in (3));
Query OK, 0 rows affected (0.00 sec)

mysql> insert into t28 values (2),(3);
Query OK, 2 rows affected (0.00 sec)
Records: 2  Duplicates: 0  Warnings: 0

mysql> insert into t28 values (4);
ERROR 1030 (HY000): Got error 1 from storage engine
mysql> insert into t28 values (1);
ERROR 2013 (HY000): Lost connection to MySQL server during query

I was able to repeat this in 5.1.2bk

Error in binary search, using unsigned int when signed int was needed

This bug has been fixed and will appear in 5.1.6

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.

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Additional info:

Documented bugfix in 5.1.6 changelog. Closed.