Sanity check record length before skipping explicit IV in TLS 1.2, 1.1 and

DTLS to fix DoS attack.

Thanks to Codenomicon for discovering this issue using Fuzz-o-Matic
fuzzing as a service testing platform.
(CVE-2012-2333)

ssl/d1_enc.c

@@ -260,7 +260,7 @@ int dtls1_enc(SSL *s, int send)
 				}
 			/* TLS 1.0 does not bound the number of padding bytes by the block size.
 			 * All of them must have value 'padding_length'. */
-			if (i > (int)rec->length)
+			if (i + bs > (int)rec->length)
 				{
 				/* Incorrect padding. SSLerr() and ssl3_alert are done
 				 * by caller: we don't want to reveal whether this is