commit 8c341c467f2562646522999eb94e1e51a3fae432
author simon.fraser@apple.com <simon.fraser@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> Fri Apr 10 05:21:14 2015 +0000
committer simon.fraser@apple.com <simon.fraser@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> Fri Apr 10 05:21:14 2015 +0000
tree e2360ab8da1e02c51a9911b1f0b62b2d3e7f0744
parent 8bf2a91fe6054696b897ef882cf2a81c8d03d9ff

Some CSS3 filters tests crash under iOS testing
https://bugs.webkit.org/show_bug.cgi?id=143594
rdar://problem/20491140

Reviewed by David Kilzer.

Some tests disable accelerated compositing via testRunner.overridePreference(). In this case,
we'd not create a root scrolling tree node, so null-check it in AsyncScrollingCoordinator::updateNonFastScrollableRegion().

* page/scrolling/AsyncScrollingCoordinator.cpp:
(WebCore::AsyncScrollingCoordinator::updateNonFastScrollableRegion):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@182621 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebCore/page/scrolling/AsyncScrollingCoordinator.cpp

diff --git a/Source/WebCore/page/scrolling/AsyncScrollingCoordinator.cpp b/Source/WebCore/page/scrolling/AsyncScrollingCoordinator.cpp
index 1209049..ce94901 100644
--- a/Source/WebCore/page/scrolling/AsyncScrollingCoordinator.cpp
+++ b/Source/WebCore/page/scrolling/AsyncScrollingCoordinator.cpp
@@ -90,6 +90,9 @@
     if (!m_nonFastScrollableRegionDirty)
         return;
 
+    if (!m_scrollingStateTree->rootStateNode())
+        return;
+
     m_scrollingStateTree->rootStateNode()->setNonFastScrollableRegion(computeNonFastScrollableRegion(m_page->mainFrame(), IntPoint()));
     m_nonFastScrollableRegionDirty = false;
 }