Fixup MSan embeddertests

fpdfsdk/fpdfformfill.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "public/fpdf_formfill.h"
 
 #include <memory>
 #include <vector>
@@ skipping 259 matching lines @@
 
   CPDFSDK_FormFillEnvironment* pEnv = HandleToCPDFSDKEnvironment(hHandle);
 
 #ifdef PDF_ENABLE_XFA
   CPDFXFA_App::GetInstance()->RemoveFormFillEnv(pEnv);
 
   // Reset the focused annotations and remove the SDK document from the
   // XFA document.
   if (CPDFSDK_Document* pSDKDoc = pEnv->GetSDKDocument()) {
     pSDKDoc->ClearAllFocusedAnnots();
-    pSDKDoc->GetXFADocument()->SetSDKDoc(nullptr);
+    // If the document was closed first, it's possible the XFA document
+    // is now a nullptr.
+    if (pSDKDoc->GetXFADocument())
+      pSDKDoc->GetXFADocument()->SetSDKDoc(nullptr);
   }
 #endif  // PDF_ENABLE_XFA
 
   delete pEnv;
 }
 
 DLLEXPORT FPDF_BOOL STDCALL FORM_OnMouseMove(FPDF_FORMHANDLE hHandle,
                                              FPDF_PAGE page,
                                              int modifier,
                                              double page_x,
@@ skipping 445 matching lines @@
       CPDF_Action action = aa.GetAction(CPDF_AAction::OpenPage);
       pActionHandler->DoAction_Page(action, CPDF_AAction::OpenPage, pSDKDoc);
     }
   } else {
     if (aa.ActionExist(CPDF_AAction::ClosePage)) {
       CPDF_Action action = aa.GetAction(CPDF_AAction::ClosePage);
       pActionHandler->DoAction_Page(action, CPDF_AAction::ClosePage, pSDKDoc);
     }
   }
 }