Store the address of the page data map's value for proper referencing.

core/src/fpdfapi/fpdf_page/fpdf_page_pattern.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_page.h"
 #include "pageint.h"
 
 CPDF_Pattern::CPDF_Pattern(const CFX_AffineMatrix* pParentMatrix) :
@@ skipping 65 matching lines @@
         }
     } else {
         m_pShadingObj = pPatternObj;
     }
     m_ShadingType = 0;
     m_pCS = NULL;
     m_nFuncs = 0;
     for (int i = 0; i < 4; i ++) {
         m_pFunctions[i] = NULL;
     }
+    m_pCountedCS = NULL;
 }
 CPDF_ShadingPattern::~CPDF_ShadingPattern()
 {
     Clear();
 }
 void CPDF_ShadingPattern::Clear()
 {
     for (int i = 0; i < m_nFuncs; i ++) {
         if (m_pFunctions[i]) {
             delete m_pFunctions[i];
         }
         m_pFunctions[i] = NULL;
     }
-    CPDF_ColorSpace* pCS = m_pCS;
-    if (!m_bForceClear && pCS && m_pDocument) {
+    CPDF_ColorSpace* pCS = m_pCountedCS ? m_pCountedCS->m_Obj : NULL;
+    if (pCS && m_pDocument) {
         m_pDocument->GetPageData()->ReleaseColorSpace(pCS->GetArray());
     }
     m_ShadingType = 0;
     m_pCS = NULL;
+    m_pCountedCS = NULL;
     m_nFuncs = 0;
 }
 FX_BOOL CPDF_ShadingPattern::Load()
 {
     if (m_ShadingType != 0) {
         return TRUE;
     }
     CPDF_Dictionary* pShadingDict = m_pShadingObj ? m_pShadingObj->GetDict() : NULL;
     if (pShadingDict == NULL) {
         return FALSE;
@@ skipping 19 matching lines @@
             m_pFunctions[0] = CPDF_Function::Load(pFunc);
             m_nFuncs = 1;
         }
     }
     CPDF_Object* pCSObj = pShadingDict->GetElementValue(FX_BSTRC("ColorSpace"));
     if (pCSObj == NULL) {
         return FALSE;
     }
     CPDF_DocPageData* pDocPageData = m_pDocument->GetPageData();
     m_pCS = pDocPageData->GetColorSpace(pCSObj, NULL);
+    if (m_pCS) {
+        m_pCountedCS = pDocPageData->FindColorSpacePtr(m_pCS->GetArray());
+    }
     m_ShadingType = pShadingDict->GetInteger(FX_BSTRC("ShadingType"));
     return TRUE;
 }
 FX_BOOL CPDF_ShadingPattern::Reload()
 {
     Clear();
     return Load();
 }
 FX_BOOL CPDF_MeshStream::Load(CPDF_Stream* pShadingStream, CPDF_Function** pFuncs, int nFuncs, CPDF_ColorSpace* pCS)
 {
@@ skipping 127 matching lines @@
             }
         }
         stream.m_BitStream.SkipBits(stream.m_nComps * stream.m_nCompBits * color_count);
         if (bGouraud) {
             stream.m_BitStream.ByteAlign();
         }
     }
     rect.Transform(pMatrix);
     return rect;
 }