Fix bug 574524: DtlsTransportChannel crashes after SSL closes remotely

webrtc/base/opensslstreamadapter.cc

Index: webrtc/base/opensslstreamadapter.cc
diff --git a/webrtc/base/opensslstreamadapter.cc b/webrtc/base/opensslstreamadapter.cc
index 270faa0809f42013c01aeb35854d7c98b3b9cc1f..616914a654530143f16a7947beed26bc13824432 100644
--- a/webrtc/base/opensslstreamadapter.cc
+++ b/webrtc/base/opensslstreamadapter.cc
@@ -618,6 +618,10 @@ StreamResult OpenSSLStreamAdapter::Read(void* data, size_t data_len,
       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: