From 7a38b21f49961ffc4c2b6a6327a7a933a5278636 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20L=C3=BCbking?= <thomas.luebking@gmail.com>
Date: Sun, 18 Jan 2015 00:51:14 +0100
Subject: [PATCH] do not reinterpret_cast insufficient data

BUG: 341010
FIXED-IN: 5.5
REVIEW: 125513
---
 effects/kscreen/kscreen.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/effects/kscreen/kscreen.cpp b/effects/kscreen/kscreen.cpp
index ab13f46514..67f4551c98 100644
--- a/effects/kscreen/kscreen.cpp
+++ b/effects/kscreen/kscreen.cpp
@@ -122,7 +122,7 @@ void KscreenEffect::propertyNotify(EffectWindow *window, long int atom)
         return;
     }
     QByteArray byteData = effects->readRootProperty(m_atom, XCB_ATOM_CARDINAL, 32);
-    auto *data = reinterpret_cast<uint32_t *>(byteData.data());
+    const uint32_t *data = byteData.isEmpty() ? nullptr : reinterpret_cast<const uint32_t *>(byteData.data());
     if (!data // Property was deleted
         || data[0] == 0) { // normal state - KWin should have switched to it
         if (m_state != StateNormal) {