Revert of Assert that only 0-numbered objects are Released() (patchset #7 id:120001 of https://codereview.chromium.org/2375343004/ )

Reason for revert:
Broke PDFExtensionTest when rolling DEPS in Chromium.

Original issue's description:
> Assert that only 0-numbered objects are Released()
>
> This condition holds because numbered objects are brute-force
> deleted by the indirect object holder, rather than being
> released.
>
> Be careful about recursive deletion, check before advancing,
> since we no longer count on Release() doing this for us.
> Fix a few tests where the test was violating ownership rules.
>
> This should be the last step before completely removing Release()
> in favor of direct delete everywhere.
>
> Committed: https://pdfium.googlesource.com/pdfium/+/aba528a362248a54b27a7e9e046e2b65ab83f624

TBR=tsepez@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2387193003

1 files changed, 23 insertions, 14 deletions

diff --git a/core/fpdfapi/fpdf_parser/cpdf_parser.cpp b/core/fpdfapi/fpdf_parser/cpdf_parser.cpp
index bc3dfe6021..182d3869bc 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_parser.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_parser.cpp
@@ -956,34 +956,36 @@ FX_BOOL CPDF_Parser::RebuildCrossRef() {
 }
 
 FX_BOOL CPDF_Parser::LoadCrossRefV5(FX_FILESIZE* pos, FX_BOOL bMainXRef) {
-  std::unique_ptr<CPDF_Object> pObject(
-      ParseIndirectObjectAt(m_pDocument, *pos, 0));
+  CPDF_Object* pObject = ParseIndirectObjectAt(m_pDocument, *pos, 0);
   if (!pObject)
     return FALSE;
 
-  CPDF_Object* pUnownedObject = pObject.get();
-
   if (m_pDocument) {
     CPDF_Dictionary* pRootDict = m_pDocument->GetRoot();
-    if (pRootDict && pRootDict->GetObjNum() == pObject->m_ObjNum)
+    if (pRootDict && pRootDict->GetObjNum() == pObject->m_ObjNum) {
+      // If |pObject| has an objnum assigned then this will leak as Release()
+      // will early exit.
+      if (pObject->IsStream())
+        pObject->Release();
       return FALSE;
-    // Takes ownership of object (std::move someday).
-    uint32_t objnum = pObject->m_ObjNum;
-    if (!m_pDocument->ReplaceIndirectObjectIfHigherGeneration(
-            objnum, pObject.release())) {
+    }
+    if (!m_pDocument->ReplaceIndirectObjectIfHigherGeneration(pObject->m_ObjNum,
+                                                              pObject)) {
       return FALSE;
     }
   }
 
-  CPDF_Stream* pStream = pUnownedObject->AsStream();
+  CPDF_Stream* pStream = pObject->AsStream();
   if (!pStream)
     return FALSE;
 
   CPDF_Dictionary* pDict = pStream->GetDict();
   *pos = pDict->GetIntegerFor("Prev");
   int32_t size = pDict->GetIntegerFor("Size");
-  if (size < 0)
+  if (size < 0) {
+    pStream->Release();
     return FALSE;
+  }
 
   CPDF_Dictionary* pNewTrailer = ToDictionary(pDict->Clone());
   if (bMainXRef) {
@@ -1015,8 +1017,10 @@ FX_BOOL CPDF_Parser::LoadCrossRefV5(FX_FILESIZE* pos, FX_BOOL bMainXRef) {
     arrIndex.push_back(std::make_pair(0, size));
 
   pArray = pDict->GetArrayFor("W");
-  if (!pArray)
+  if (!pArray) {
+    pStream->Release();
     return FALSE;
+  }
 
   CFX_ArrayTemplate<uint32_t> WidthArray;
   FX_SAFE_UINT32 dwAccWidth = 0;
@@ -1025,8 +1029,10 @@ FX_BOOL CPDF_Parser::LoadCrossRefV5(FX_FILESIZE* pos, FX_BOOL bMainXRef) {
     dwAccWidth += WidthArray[i];
   }
 
-  if (!dwAccWidth.IsValid() || WidthArray.GetSize() < 3)
+  if (!dwAccWidth.IsValid() || WidthArray.GetSize() < 3) {
+    pStream->Release();
     return FALSE;
+  }
 
   uint32_t totalWidth = dwAccWidth.ValueOrDie();
   CPDF_StreamAcc acc;
@@ -1086,14 +1092,17 @@ FX_BOOL CPDF_Parser::LoadCrossRefV5(FX_FILESIZE* pos, FX_BOOL bMainXRef) {
         if (type == 1) {
           m_SortedOffset.insert(offset);
         } else {
-          if (offset < 0 || !IsValidObjectNumber(offset))
+          if (offset < 0 || !IsValidObjectNumber(offset)) {
+            pStream->Release();
             return FALSE;
+          }
           m_ObjectInfo[offset].type = 255;
         }
       }
     }
     segindex += count;
   }
+  pStream->Release();
   return TRUE;
 }