From 99583ddd81e42158ff740b4a7fc51389854ba057 Mon Sep 17 00:00:00 2001
From: Frederik Hertzum <frederik.hertzum@proton.me>
Date: Sat, 5 Jul 2025 12:33:56 +0200
Subject: [PATCH] add null pointer checks for listener, dev and ti

---
 Xi/exevents.c     |  4 ++--
 Xi/exevents.c.rej | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+), 2 deletions(-)
 create mode 100644 Xi/exevents.c.rej

diff --git a/Xi/exevents.c b/Xi/exevents.c
index 41a4097cc..dcbf9a1a8 100644
--- a/Xi/exevents.c
+++ b/Xi/exevents.c
@@ -1294,13 +1294,13 @@ RetrieveTouchDeliveryData(DeviceIntPtr dev, TouchPointInfoPtr ti,
     *mask = NULL;
     *grab = NULL;
 
-    if (listener->type == LISTENER_GRAB ||
+    if (listener && listener->type == LISTENER_GRAB ||
         listener->type == LISTENER_POINTER_GRAB) {
         *grab = listener->grab;
 
         BUG_RETURN_VAL(!*grab, FALSE);
     }
-    else if (ti->emulate_pointer && dev->deviceGrab.grab &&
+    else if (ti && ti->emulate_pointer && dev && dev->deviceGrab.grab &&
              !dev->deviceGrab.fromPassiveGrab) {
         /* There may be an active pointer grab on the device */
         *grab = dev->deviceGrab.grab;
diff --git a/Xi/exevents.c.rej b/Xi/exevents.c.rej
new file mode 100644
index 000000000..56408cf07
--- /dev/null
+++ b/Xi/exevents.c.rej
@@ -0,0 +1,18 @@
+--- exevents.c
++++ exevents.c
+@@ -1294,13 +1294,13 @@ RetrieveTouchDeliveryData(DeviceIntPtr dev, TouchPointInfoPtr ti,
+     *mask = NULL;
+     *grab = NULL;
+ 
+-    if (listener->type == LISTENER_GRAB ||
++    if (listener && listener->type == LISTENER_GRAB ||
+         listener->type == LISTENER_POINTER_GRAB) {
+         *grab = listener->grab;
+ 
+         BUG_RETURN_VAL(!*grab, FALSE);
+     }
+-    else if (ti->emulate_pointer && dev->deviceGrab.grab &&
++    else if (ti && ti->emulate_pointer && dev && dev->deviceGrab.grab &&
+              !dev->deviceGrab.fromPassiveGrab) {
+         /* There may be an active pointer grab on the device */
+         *grab = dev->deviceGrab.grab;