Bug 353851 - "accumulation of outer chrome windows in mOpener chains (window.opener)". r+sr=jst. a=blocking1.9.

dom/src/base/nsGlobalWindow.cpp

@@ -930,8 +930,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsGlobalWindow)
 
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mContext)
 
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mOpener)
-
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mControllers)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mArguments)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mArgumentsLast)
@@ -974,8 +972,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsGlobalWindow)
   NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mContext)
 
-  NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mOpener)
-
   NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mControllers)
   NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mArguments)
   NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mArgumentsLast)
@@ -2073,7 +2069,9 @@ nsGlobalWindow::SetOpenerWindow(nsIDOMWindowInternal* aOpener,
   NS_ASSERTION(aOpener || !aOriginalOpener,
                "Shouldn't set mHadOriginalOpener if aOpener is null");
 
-  mOpener = aOpener;
+  mOpener = do_GetWeakReference(aOpener);
+  NS_ASSERTION(mOpener, "Opener must support weak references!");
+
   if (aOriginalOpener) {
     mHadOriginalOpener = PR_TRUE;
   }
@@ -2801,11 +2799,15 @@ nsGlobalWindow::GetOpener(nsIDOMWindowInternal** aOpener)
   FORWARD_TO_OUTER(GetOpener, (aOpener), NS_ERROR_NOT_INITIALIZED);
 
   *aOpener = nsnull;
-  // First, check if we were called from a privileged chrome script
 
+  nsCOMPtr<nsIDOMWindowInternal> opener = do_QueryReferent(mOpener);
+  if (!opener) {
+    return NS_OK;
+  }
+
+  // First, check if we were called from a privileged chrome script
   if (nsContentUtils::IsCallerTrustedForRead()) {
-    *aOpener = mOpener;
-    NS_IF_ADDREF(*aOpener);
+    NS_ADDREF(*aOpener = opener);
     return NS_OK;
   }
 
@@ -2825,7 +2827,7 @@ nsGlobalWindow::GetOpener(nsIDOMWindowInternal** aOpener)
         PRUint32 appType;
         nsresult rv = openerRootDocShell->GetAppType(&appType);
         if (NS_SUCCEEDED(rv) && appType != nsIDocShell::APP_TYPE_MAIL) {
-          *aOpener = mOpener;
+          *aOpener = opener;
         }
       }
     }

dom/src/base/nsGlobalWindow.h

@@ -663,7 +663,7 @@ protected:
   PRPackedBool                  mIsChrome : 1;
 
   nsCOMPtr<nsIScriptContext>    mContext;
-  nsCOMPtr<nsIDOMWindowInternal> mOpener;
+  nsWeakPtr                     mOpener;
   nsCOMPtr<nsIControllers>      mControllers;
   nsCOMPtr<nsIArray>            mArguments;
   nsCOMPtr<nsIArray>            mArgumentsLast;