Do not re-create the page view when accessing from Document::removeField.

fpdfsdk/javascript/Document.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 "fpdfsdk/javascript/Document.h"
 
 #include <vector>
 
@@ skipping 445 matching lines @@
   if (CPDFDoc_Environment* pEnv = m_pDocument->GetEnv()) {
     pEnv->JS_docprint(bUI, nStart, nEnd, bSilent, bShrinkToFit, bPrintAsImage,
                       bReverse, bAnnotations);
     return TRUE;
   }
   return FALSE;
 }
 
 // removes the specified field from the document.
 // comment:
-// note: if the filed name is not retional, adobe is dumb for it.
+// note: if the filed name is not rational, adobe is dumb for it.
 
 FX_BOOL Document::removeField(IJS_Context* cc,
                               const std::vector<CJS_Value>& params,
                               CJS_Value& vRet,
                               CFX_WideString& sError) {
   if (!(m_pDocument->GetPermissions(FPDFPERM_MODIFY) ||
         m_pDocument->GetPermissions(FPDFPERM_ANNOT_FORM)))
     return FALSE;
 
   CJS_Context* pContext = static_cast<CJS_Context*>(cc);
@@ skipping 16 matching lines @@
     CFX_FloatRect rcAnnot = pWidget->GetRect();
     --rcAnnot.left;
     --rcAnnot.bottom;
     ++rcAnnot.right;
     ++rcAnnot.top;
 
     std::vector<CFX_FloatRect> aRefresh(1, rcAnnot);
     UnderlyingPageType* pPage = pWidget->GetUnderlyingPage();
     ASSERT(pPage);
 
-    CPDFSDK_PageView* pPageView = m_pDocument->GetPageView(pPage, true);
-    pPageView->DeleteAnnot(pWidget);
-    pPageView->UpdateRects(aRefresh);
+    // If there is currently no pageview associated with the page being used
+    // do not create one. We may be in the process of tearing down the document
+    // and creating a new pageview at this point will cause bad things.
+    CPDFSDK_PageView* pPageView = m_pDocument->GetPageView(pPage, false);
+    if (pPageView) {
+      pPageView->DeleteAnnot(pWidget);
+      pPageView->UpdateRects(aRefresh);
+    }
   }
   m_pDocument->SetChangeMark();
 
   return TRUE;
 }
 
 // reset filed values within a document.
 // comment:
 // note: if the fields names r not rational, aodbe is dumb for it.
 
@@ skipping 1133 matching lines @@
     }
   }
 
   for (const auto& pData : DelayDataForFieldAndControlIndex)
     Field::DoDelay(m_pDocument, pData.get());
 }
 
 CJS_Document* Document::GetCJSDoc() const {
   return static_cast<CJS_Document*>(m_pJSObject);
 }