Add consistency check for DTLS fragments
Fix for CVE-2014-0195

A buffer overrun attack can be triggered by sending invalid DTLS fragments
to an OpenSSL DTLS client or server. This is potentially exploitable to
run arbitrary code on a vulnerable client or server.

Fixed by adding consistency check for DTLS fragments.

http://git.openssl.org/gitweb/?p=openssl.git;a=commit;h=410e444b71bca5af929fe82162cbe37e31c82083