Fix bug 574524: DtlsTransportChannel crashes after SSL closes remotely

webrtc/base/opensslstreamadapter.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 600 matching lines @@
       return SR_SUCCESS;
     case SSL_ERROR_WANT_READ:
       LOG(LS_VERBOSE) << " -- error want read";
       return SR_BLOCK;
     case SSL_ERROR_WANT_WRITE:
       LOG(LS_VERBOSE) << " -- error want write";
       ssl_read_needs_write_ = true;
       return SR_BLOCK;
     case SSL_ERROR_ZERO_RETURN:
       LOG(LS_VERBOSE) << " -- remote side closed";
+      // When we're closed at SSL layer, also close the stream level which
+      // performs necessary clean up. Otherwise, a new incoming packet after
+      // this could overflow the stream buffer.
+      this->stream()->Close();
       return SR_EOS;
       break;
     default:
       LOG(LS_VERBOSE) << " -- error " << code;
       Error("SSL_read", (ssl_error ? ssl_error : -1), false);
       if (error)
         *error = ssl_error_code_;
       return SR_ERROR;
   }
   // not reached
@@ skipping 532 matching lines @@
     }
   } else {
     RTC_NOTREACHED();
     return kDefaultSslEcCipher12;
   }
 }
 
 }  // namespace rtc
 
 #endif  // HAVE_OPENSSL_SSL_H