Ignore out-of-order DTLS ChangeCipherSpec.

net/third_party/nss/ssl/ssl3con.c

 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /*
  * SSL3 Protocol
  *
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 /* TODO(ekr): Implement HelloVerifyRequest on server side. OK for now. */
 
@@ skipping 3603 matching lines @@
     SSL3WaitState              ws      = ss->ssl3.hs.ws;
     SSL3ChangeCipherSpecChoice change;
 
     PORT_Assert( ss->opt.noLocks || ssl_HaveRecvBufLock(ss) );
     PORT_Assert( ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss) );
 
     SSL_TRC(3, ("%d: SSL3[%d]: handle change_cipher_spec record",
                 SSL_GETPID(), ss->fd));
 
     if (ws != wait_change_cipher) {
+        if (IS_DTLS(ss)) {
+            /* Ignore this because it's out of order. */
+            SSL_TRC(3, ("%d: SSL3[%d]: discard out of order "
+                        "DTLS change_cipher_spec",
+                        SSL_GETPID(), ss->fd));
+            buf->len = 0;
+            return SECSuccess;
+        }
         (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message);
         PORT_SetError(SSL_ERROR_RX_UNEXPECTED_CHANGE_CIPHER);
         return SECFailure;
     }
 
     if(buf->len != 1) {
         (void)ssl3_DecodeError(ss);
         PORT_SetError(SSL_ERROR_RX_MALFORMED_CHANGE_CIPHER);
         return SECFailure;
     }
@@ skipping 9207 matching lines @@
             PORT_Free(ss->ssl3.hs.recvdFragments.buf);
         }
     }
 
     ss->ssl3.initialized = PR_FALSE;
 
     SECITEM_FreeItem(&ss->ssl3.nextProto, PR_FALSE);
 }
 
 /* End of ssl3con.c */