Fix a small leak in CPDF_DataAvail::CheckTrailer().

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 <utility>
 #include <vector>
 
 #include "../../../include/fpdfapi/fpdf_module.h"
@@ skipping 4086 matching lines @@
     }
   }
   if (m_dwPrevXRefOffset) {
     SetStartOffset(m_dwPrevXRefOffset);
     m_docStatus = PDF_DATAAVAIL_CROSSREF;
   } else {
     m_docStatus = PDF_DATAAVAIL_LOADALLCRSOSSREF;
   }
   return TRUE;
 }
+
 FX_BOOL CPDF_DataAvail::CheckTrailer(IFX_DownloadHints* pHints) {
   int32_t iTrailerSize =
       (int32_t)(m_Pos + 512 > m_dwFileLen ? m_dwFileLen - m_Pos : 512);
   if (m_pFileAvail->IsDataAvail(m_Pos, iTrailerSize)) {
     int32_t iSize = (int32_t)(m_Pos + iTrailerSize - m_dwTrailerOffset);
     CFX_BinaryBuf buf(iSize);
     uint8_t* pBuf = buf.GetBuffer();
     if (!pBuf) {
       m_docStatus = PDF_DATAAVAIL_ERROR;
       return FALSE;
     }
     if (!m_pFileRead->ReadBlock(pBuf, m_dwTrailerOffset, iSize)) {
       return FALSE;
     }
     CFX_SmartPointer<IFX_FileStream> file(
         FX_CreateMemoryStream(pBuf, (size_t)iSize, FALSE));
     m_syntaxParser.InitParser(file.Get(), 0);
-    CPDF_Object* pTrailer = m_syntaxParser.GetObject(NULL, 0, 0, 0);
+    CPDF_Object* pTrailer = m_syntaxParser.GetObject(nullptr, 0, 0);
     if (!pTrailer) {
       m_Pos += m_syntaxParser.SavePos();
       pHints->AddSegment(m_Pos, iTrailerSize);
       return FALSE;
     }
     if (pTrailer->GetType() != PDFOBJ_DICTIONARY) {
+      pTrailer->Release();
       return FALSE;
     }
     CPDF_Dictionary* pTrailerDict = pTrailer->GetDict();
     if (pTrailerDict) {
       CPDF_Object* pEncrypt = pTrailerDict->GetElement("Encrypt");
       if (pEncrypt && pEncrypt->GetType() == PDFOBJ_REFERENCE) {
         m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
         pTrailer->Release();
         return TRUE;
       }
@@ skipping 17 matching lines @@
       return TRUE;
     }
     m_dwPrevXRefOffset = 0;
     m_docStatus = PDF_DATAAVAIL_TRAILER_APPEND;
     pTrailer->Release();
     return TRUE;
   }
   pHints->AddSegment(m_Pos, iTrailerSize);
   return FALSE;
 }
+
 FX_BOOL CPDF_DataAvail::CheckPage(int32_t iPage, IFX_DownloadHints* pHints) {
   while (TRUE) {
     switch (m_docStatus) {
       case PDF_DATAAVAIL_PAGETREE:
         if (!LoadDocPages(pHints)) {
           return FALSE;
         }
         break;
       case PDF_DATAAVAIL_PAGE:
         if (!LoadDocPage(iPage, pHints)) {
@@ skipping 532 matching lines @@
   return FALSE;
 }
 CPDF_PageNode::~CPDF_PageNode() {
   int32_t iSize = m_childNode.GetSize();
   for (int32_t i = 0; i < iSize; ++i) {
     CPDF_PageNode* pNode = (CPDF_PageNode*)m_childNode[i];
     delete pNode;
   }
   m_childNode.RemoveAll();
 }