From c5309abbd094af50b5d4d868b70b2221ff387b07 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Wed, 16 Jan 2019 16:24:56 +0100
Subject: [PATCH] module/xwindow: don't crash if there is no active window

---
 modules/xwindow.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/modules/xwindow.c b/modules/xwindow.c
index 138a748..8aa2b37 100644
--- a/modules/xwindow.c
+++ b/modules/xwindow.c
@@ -57,6 +57,11 @@ update_active_window(struct private *m)
         return;
     }
 
+    if (xcb_get_property_value_length(r) != sizeof(m->active_win)) {
+        free(r);
+        return;
+    }
+
     assert(sizeof(m->active_win) == xcb_get_property_value_length(r));
     memcpy(&m->active_win, xcb_get_property_value(r), sizeof(m->active_win));
     free(r);