XFA: Change the destruction order inside CPDFXFA_Document to avoid UAFs.

R=jun_fang@foxitsoftware.com, tsepez@chromium.org

Review URL: https://codereview.chromium.org/1566903002 .

1 files changed, 9 insertions, 25 deletions

diff --git a/fpdfsdk/src/fpdfxfa/fpdfxfa_doc.cpp b/fpdfsdk/src/fpdfxfa/fpdfxfa_doc.cpp
index 16f3209af3..fb30ba44d0 100644
--- a/fpdfsdk/src/fpdfxfa/fpdfxfa_doc.cpp
+++ b/fpdfsdk/src/fpdfxfa/fpdfxfa_doc.cpp
@@ -45,14 +45,17 @@ CPDFXFA_Document::CPDFXFA_Document(CPDF_Document* pPDFDoc,
 }

 

 CPDFXFA_Document::~CPDFXFA_Document() {

+  if (m_pJSContext && m_pSDKDoc && m_pSDKDoc->GetEnv())

+    m_pSDKDoc->GetEnv()->GetJSRuntime()->ReleaseContext(m_pJSContext);

+

+  delete m_pSDKDoc;

+

   if (m_pPDFDoc) {

-    CPDF_Parser* pParser = (CPDF_Parser*)m_pPDFDoc->GetParser();

-    if (pParser == NULL) {

-      delete m_pPDFDoc;

-    } else {

+    CPDF_Parser* pParser = m_pPDFDoc->GetParser();

+    if (pParser)

       delete pParser;

-    }

-    m_pPDFDoc = NULL;

+    else

+      delete m_pPDFDoc;

   }

   if (m_pXFADoc) {

     IXFA_App* pApp = m_pApp->GetXFAApp();

@@ -63,17 +66,6 @@ CPDFXFA_Document::~CPDFXFA_Document() {
       }

     }

   }

-

-  if (m_pJSContext) {

-    if (m_pSDKDoc && m_pSDKDoc->GetEnv()) {

-      m_pSDKDoc->GetEnv()->GetJSRuntime()->ReleaseContext(m_pJSContext);

-      m_pJSContext = NULL;

-    }

-  }

-

-  if (m_pSDKDoc)

-    delete m_pSDKDoc;

-  m_pSDKDoc = NULL;

 }

 

 FX_BOOL CPDFXFA_Document::LoadXFADoc() {

@@ -204,13 +196,6 @@ CPDFSDK_Document* CPDFXFA_Document::GetSDKDocument(
   return m_pSDKDoc;

 }

 

-void CPDFXFA_Document::ReleaseSDKDoc() {

-  if (m_pSDKDoc)

-    delete m_pSDKDoc;

-

-  m_pSDKDoc = NULL;

-}

-

 void CPDFXFA_Document::FXRect2PDFRect(const CFX_RectF& fxRectF,

                                       CPDF_Rect& pdfRect) {

   pdfRect.left = fxRectF.left;

@@ -219,7 +204,6 @@ void CPDFXFA_Document::FXRect2PDFRect(const CFX_RectF& fxRectF,
   pdfRect.bottom = fxRectF.top;

 }

 

-//////////////////////////////////////////////////////////////////////////

 void CPDFXFA_Document::SetChangeMark(IXFA_Doc* hDoc) {

   if (hDoc == m_pXFADoc && m_pSDKDoc) {

     m_pSDKDoc->SetChangeMark();