Fix the OpenSSL implementation of ExportKeyingMaterial.

net/socket/ssl_client_socket_openssl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // OpenSSL binding for SSLClientSocket. The class layout and general principle
 // of operation is derived from SSLClientSocketNSS.
 
 #include "net/socket/ssl_client_socket_openssl.h"
 
 #include <errno.h>
@@ skipping 404 matching lines @@
 }
 
 int SSLClientSocketOpenSSL::ExportKeyingMaterial(
     const base::StringPiece& label,
     bool has_context, const base::StringPiece& context,
     unsigned char* out, unsigned int outlen) {
   crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
 
   int rv = SSL_export_keying_material(
       ssl_, out, outlen, label.data(), label.size(),
-      reinterpret_cast<const unsigned char*>(context.data()),
-      context.length(), context.length() > 0);
+      reinterpret_cast<const unsigned char*>(context.data()), context.length(),
+      has_context ? 1 : 0);
 
   if (rv != 1) {
     int ssl_error = SSL_get_error(ssl_, rv);
     LOG(ERROR) << "Failed to export keying material;"
                << " returned " << rv
                << ", SSL error code " << ssl_error;
     return MapOpenSSLError(ssl_error, err_tracer);
   }
   return OK;
 }
@@ skipping 1510 matching lines @@
 
   return result;
 }
 
 scoped_refptr<X509Certificate>
 SSLClientSocketOpenSSL::GetUnverifiedServerCertificateChain() const {
   return server_cert_;
 }
 
 }  // namespace net