Check for NULL pointer before assigning the test data

content/common/sandbox_mac_unittest_helper.mm

 // Copyright (c) 2011 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/common/sandbox_mac_unittest_helper.h"
 
 extern "C" {
 #include <sandbox.h>
 }
 
@@ skipping 130 matching lines @@
 
   const char* test_data = getenv(kTestDataKey);
 
   // Find Test Function to run;
   scoped_ptr<sandboxtest::MacSandboxTestCase>
       test_case(sandboxtest::SandboxTestForName(sandbox_test_name));
   if (!test_case.get()) {
     LOG(ERROR) << "Invalid sandbox test name (" << sandbox_test_name << ")";
     return -1;
   }
-  test_case->SetTestData(test_data);
+  if (test_data)
+    test_case->SetTestData(test_data);
 
   // Run Test.
   if (!test_case->BeforeSandboxInit()) {
     LOG(ERROR) << sandbox_test_name << "Failed test before sandbox init";
     return -1;
   }
 
   Sandbox::SandboxWarmup(sandbox_type);
 
   if (!Sandbox::EnableSandbox(sandbox_type, FilePath())) {
     LOG(ERROR) << "Failed to initialize sandbox " << sandbox_type;
     return -1;
   }
 
   if (!test_case->SandboxedTest()) {
     LOG(ERROR) << sandbox_test_name << "Failed sandboxed test";
     return -1;
   }
 
   return 0;
 }
 
 }  // namespace