File xembedsniproxy-fix-possible-crash.patch of Package plasma5-workspace

From a17de5957d4ba0f07c77fa99860c9046ff8aa1be Mon Sep 17 00:00:00 2001
From: Wolfgang Bauer <wbauer@tmo.at>
Date: Sat, 17 Jun 2017 19:19:40 +0200
Subject: [xembedsniproxy] Fix memleak and possible crash

Check the return value of xcb_get_window_attributes_reply() to prevent a crash if getting the window attributes would fail for some reason.

Also free the returned structure after usage to avoid memleaks.
This is necessary according to https://xcb.freedesktop.org/windowcontextandmanipulation (see the end of the page).

Differential Revision: https://phabricator.kde.org/D6252
---
 xembed-sni-proxy/sniproxy.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xembed-sni-proxy/sniproxy.cpp b/xembed-sni-proxy/sniproxy.cpp
index 5974baf..b2f64fb 100644
--- a/xembed-sni-proxy/sniproxy.cpp
+++ b/xembed-sni-proxy/sniproxy.cpp
@@ -209,8 +209,9 @@ SNIProxy::SNIProxy(xcb_window_t wid, QObject* parent):
     //if the client does supports that we send directly, otherwise we'll use xtest
     auto waCookie = xcb_get_window_attributes(c, wid);
     auto windowAttributes = xcb_get_window_attributes_reply(c, waCookie, nullptr);
-    if (! (windowAttributes->all_event_masks & XCB_EVENT_MASK_BUTTON_PRESS)) {
+    if (windowAttributes && ! (windowAttributes->all_event_masks & XCB_EVENT_MASK_BUTTON_PRESS)) {
         m_injectMode = XTest;
+        free(windowAttributes);
     }
 
     //there's no damage event for the first paint, and sometimes it's not drawn immediately
-- 
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