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

core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp

Index: core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp
diff --git a/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp b/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp
index 67ea4fee658ed59a243013e3111a6ffaf1b63ec9..467ef9b3f6853e6474b8d158818a95cf93f4a33c 100644
--- a/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp
+++ b/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp
@@ -83,6 +83,7 @@ CPDF_ShadingPattern::CPDF_ShadingPattern(CPDF_Document* pDoc, CPDF_Object* pPatt
     for (int i = 0; i < 4; i ++) {
         m_pFunctions[i] = NULL;
     }
+    m_pCountedCS = NULL;
 }
 CPDF_ShadingPattern::~CPDF_ShadingPattern()
 {
@@ -96,12 +97,13 @@ void CPDF_ShadingPattern::Clear()
         }
         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()
@@ -141,6 +143,9 @@ FX_BOOL CPDF_ShadingPattern::Load()
     }
     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;
 }