Crashes in DrawingAreaProxy::setExposedRect (null DrawingAreaProxy)

https://bugs.webkit.org/show_bug.cgi?id=127445

Reviewed by Anders Carlsson.

* UIProcess/API/ios/WKContentView.mm:
(-[WKContentView _updateViewExposedRect]):
* UIProcess/API/mac/WKView.mm:
(-[WKView _updateViewExposedRect]):
Null-check.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@162556 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebKit2/ChangeLog

+2014-01-22  Tim Horton  <timothy_horton@apple.com>
+
+        Crashes in DrawingAreaProxy::setExposedRect (null DrawingAreaProxy)
+        https://bugs.webkit.org/show_bug.cgi?id=127445
+
+        Reviewed by Anders Carlsson.
+
+        * UIProcess/API/ios/WKContentView.mm:
+        (-[WKContentView _updateViewExposedRect]):
+        * UIProcess/API/mac/WKView.mm:
+        (-[WKView _updateViewExposedRect]):
+        Null-check.
+
 2014-01-22  Anders Carlsson  <andersca@apple.com>
 
         Add WKWebView class

Source/WebKit2/UIProcess/API/ios/WKContentView.mm

@@ -142,7 +142,9 @@ using namespace WebKit;
 {
     FloatPoint exposedRectPosition = _currentExposedRectPosition;
     exposedRectPosition.scale(_page->pageScaleFactor(), _page->pageScaleFactor());
-    _page->drawingArea()->setExposedRect(FloatRect(exposedRectPosition, _page->drawingArea()->size()));
+
+    if (auto drawingArea = _page->drawingArea())
+        drawingArea->setExposedRect(FloatRect(exposedRectPosition, _page->drawingArea()->size()));
 }
 
 - (void)setViewportSize:(CGSize)size

Source/WebKit2/UIProcess/API/mac/WKView.mm

@@ -391,7 +391,8 @@ struct WKViewInterpretKeyEventsParameters {
     if (_data->_useContentPreparationRectForVisibleRect)
         exposedRect = NSUnionRect(_data->_contentPreparationRect, exposedRect);
 
-    _data->_page->drawingArea()->setExposedRect(_data->_clipsToVisibleRect ? FloatRect(exposedRect) : FloatRect::infiniteRect());
+    if (auto drawingArea = _data->_page->drawingArea())
+        drawingArea->setExposedRect(_data->_clipsToVisibleRect ? FloatRect(exposedRect) : FloatRect::infiniteRect());
 }
 
 - (void)setFrameSize:(NSSize)size