From e86df0206f06b8d1e97e2b60db8f74a398d53127 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Tue, 9 Dec 2014 01:54:51 +0100
Subject: [PATCH] avdevice/xcbgrab: check xcb_query_pointer_reply_t pointer
 before use

Fixes CID1254668

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavdevice/xcbgrab.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/libavdevice/xcbgrab.c b/libavdevice/xcbgrab.c
index f2b913508a..ca85186087 100644
--- a/libavdevice/xcbgrab.c
+++ b/libavdevice/xcbgrab.c
@@ -106,12 +106,17 @@ static int xcbgrab_reposition(AVFormatContext *s,
                               xcb_get_geometry_reply_t *geo)
 {
     XCBGrabContext *c = s->priv_data;
-    int x = c->x, y = c->y, p_x = p->win_x, p_y = p->win_y;
+    int x, y, p_x, p_y;
     int w = c->width, h = c->height, f = c->follow_mouse;
 
     if (!p || !geo)
         return AVERROR(EIO);
 
+    x = c->x;
+    y = c->y;
+    p_x = p->win_x;
+    p_y = p->win_y;
+
     if (f == FOLLOW_CENTER) {
         x = p_x - w / 2;
         y = p_y - h / 2;