Fix crash in _CMapLookupCallback

core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.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 "../../../include/fpdfapi/fpdf_parser.h"
 #include "../../../include/fpdfapi/fpdf_module.h"
 #include "../../../include/fpdfapi/fpdf_page.h"
 #include "../fpdf_page/pageint.h"
@@ skipping 1366 matching lines @@
     CPDF_Object* pObj = m_Syntax.GetObject(pObjList, objnum, gennum, 0, pContext);
     FX_FILESIZE endOffset = m_Syntax.SavePos();
     CFX_ByteString bsWord = m_Syntax.GetKeyword();
     if (bsWord == FX_BSTRC("endobj")) {
         endOffset = m_Syntax.SavePos();
     }
     FX_DWORD objSize = endOffset - objOffset;
     m_Syntax.RestorePos(SavedPos);
     if (pObj && !objnum) {
         pObj->m_ObjNum = real_objnum;
+        pObj->m_GenNum = gennum;
     }
     return pObj;
 }
 CPDF_Object* CPDF_Parser::ParseIndirectObjectAtByStrict(CPDF_IndirectObjects* pObjList, FX_FILESIZE pos, FX_DWORD objnum,
         struct PARSE_CONTEXT* pContext, FX_FILESIZE *pResultPos)
 {
     FX_FILESIZE SavedPos = m_Syntax.SavePos();
     m_Syntax.RestorePos(pos);
     FX_BOOL bIsNumber;
     CFX_ByteString word = m_Syntax.GetNextWord(bIsNumber);
@@ skipping 2983 matching lines @@
 {
     FX_INT32 iSize = m_childNode.GetSize();
     for (FX_INT32 i = 0; i < iSize; ++i) {
         CPDF_PageNode *pNode = (CPDF_PageNode*)m_childNode[i];
         if (pNode) {
             delete pNode;
         }
     }
     m_childNode.RemoveAll();
 }