Samba CVE 2013-4124 integer overflow exploit added

Hello!

I wrote metasploit module for exploitation CVE 2013-4124, but I'm not sure that my code is clear enough for pulling it. Can anyone criticize it (Im new metasploit user, maybe I miss something important)?

I tested exploit under Debian 6.0 x86 with 3.5.21 samba version (and It's works!^_^).

Thx.