Fix a hang issue due to inconsistent page number in the test file

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 "../../../../third_party/numerics/safe_math.h"
@@ skipping 3971 matching lines @@
         pPage->Release();
         m_docStatus = PDF_DATAAVAIL_ERROR;
         return FALSE;
     }
     pPage->Release();
     return TRUE;
 }
 FX_BOOL CPDF_DataAvail::CheckPageNode(CPDF_PageNode &pageNodes, FX_INT32 iPage, FX_INT32 &iCount, IFX_DownloadHints* pHints)
 {
     FX_INT32 iSize = pageNodes.m_childNode.GetSize();
-    if (!iSize) {
+    if (iSize <= 0 || iPage >= iSize) {
         m_docStatus = PDF_DATAAVAIL_ERROR;
         return FALSE;
     }
     for (FX_INT32 i = 0; i < iSize; ++i) {
         CPDF_PageNode *pNode = (CPDF_PageNode*)pageNodes.m_childNode.GetAt(i);
         if (!pNode) {
             continue;
         }
         switch (pNode->m_type) {
             case PDF_PAGENODE_UNKOWN:
@@ skipping 402 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();
 }