Ensure we don't leak a callback object when starting a sandboxed process.

content/browser/android/sandboxed_process_launcher.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.
 
 #include "content/browser/android/sandboxed_process_launcher.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "jni/SandboxedProcessLauncher_jni.h"
 
 using base::android::AttachCurrentThread;
 using base::android::ToJavaArrayOfStrings;
 using base::android::ScopedJavaLocalRef;
 using base::GlobalDescriptors;
 using content::StartSandboxedProcessCallback;
 
 namespace content {
 
 // Called from SandboxedProcessLauncher.java when the SandboxedProcess was
 // started.
 // |client_context| is the pointer to StartSandboxedProcessCallback which was
 // passed in from StartSandboxedProcess.
-// |handle| is the processID of the child process as originated in Java.
+// |handle| is the processID of the child process as originated in Java, 0 if
+// the SandboxedProcess could not be created.
 static void OnSandboxedProcessStarted(JNIEnv*,
                                       jclass,
                                       jint client_context,
                                       jint handle) {
   StartSandboxedProcessCallback* callback =
       reinterpret_cast<StartSandboxedProcessCallback*>(client_context);
-  callback->Run(static_cast<base::ProcessHandle>(handle));
+  if (handle)
+    callback->Run(static_cast<base::ProcessHandle>(handle));
   delete callback;
 }
 
 void StartSandboxedProcess(
     const CommandLine::StringVector& argv,
     int ipc_fd,
     const GlobalDescriptors::Mapping& files_to_register,
     const StartSandboxedProcessCallback& callback) {
   JNIEnv* env = AttachCurrentThread();
   DCHECK(env);
@@ skipping 25 matching lines @@
   JNIEnv* env = AttachCurrentThread();
   DCHECK(env);
   Java_SandboxedProcessLauncher_stop(env, static_cast<jint>(handle));
 }
 
 bool RegisterSandboxedProcessLauncher(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content