Initialize the CPDF_Document pointer

core/fpdfapi/fpdf_parser/cpdf_parser.cpp

 // Copyright 2016 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 "core/fpdfapi/fpdf_parser/include/cpdf_parser.h"
 
 #include <vector>
 
@@ skipping 33 matching lines @@
   return pObjStream->GetDict()->GetIntegerBy("N");
 }
 
 int32_t GetStreamFirst(CPDF_StreamAcc* pObjStream) {
   return pObjStream->GetDict()->GetIntegerBy("First");
 }
 
 }  // namespace
 
 CPDF_Parser::CPDF_Parser()
-    : m_bHasParsed(false),
+    : m_pDocument(nullptr),
+      m_bHasParsed(false),
       m_bOwnFileRead(true),
       m_FileVersion(0),
       m_pTrailer(nullptr),
       m_pEncryptDict(nullptr),
       m_bVersionUpdated(false),
       m_pLinearized(nullptr),
       m_dwFirstPageNo(0),
       m_dwXrefStartObjNum(0) {
   m_pSyntax.reset(new CPDF_SyntaxParser);
 }
@@ skipping 1596 matching lines @@
   if (!LoadLinearizedAllCrossRefV4(m_LastXRefOffset, m_dwXrefStartObjNum) &&
       !LoadLinearizedAllCrossRefV5(m_LastXRefOffset)) {
     m_LastXRefOffset = 0;
     m_pSyntax->m_MetadataObjnum = dwSaveMetadataObjnum;
     return FORMAT_ERROR;
   }
 
   m_pSyntax->m_MetadataObjnum = dwSaveMetadataObjnum;
   return SUCCESS;
 }