From f52c1db02f751d0d00591126a37e2bd14c7e9364 Mon Sep 17 00:00:00 2001
From: Erik Verbruggen <erik.verbruggen@digia.com>
Date: Thu, 11 Sep 2014 11:02:05 +0200
Subject: [PATCH] Help: fix possible nullptr deref.

Setting QTC_HELPVIEWER_BACKEND to "native" when the native backend is
not compiled in, would result in a nullptr deref.

Change-Id: I5618650e0c4ae1c986a54a46232e8f782e43f350
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
---
 src/plugins/help/helpplugin.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/plugins/help/helpplugin.cpp b/src/plugins/help/helpplugin.cpp
index 5d0f9fdcfa1..f77eed732a0 100644
--- a/src/plugins/help/helpplugin.cpp
+++ b/src/plugins/help/helpplugin.cpp
@@ -566,6 +566,9 @@ HelpViewer *HelpPlugin::createHelpViewer(qreal zoom)
     if (backend.compare(QLatin1String("native"), Qt::CaseInsensitive) == 0) {
 #ifdef QTC_MAC_NATIVE_HELPVIEWER
         viewer = new MacWebKitHelpViewer(zoom);
+#else
+        qWarning() << "native help viewer is requested, but was not enabled during compilation";
+        viewer = new TextBrowserHelpViewer(zoom);
 #endif
     } else if (backend.compare(QLatin1String("textbrowser"), Qt::CaseInsensitive) == 0) {
         viewer = new TextBrowserHelpViewer(zoom);