[mutter] wayland/seat: Unset resource user data when disabling

[Marge Bot <marge-bot src gnome org>]

commit 9827687ca10b71100339788e2f79e364504a9e17
Author: Jonas Ådahl <jadahl gmail com>
Date:   Mon Apr 12 14:54:15 2021 +0200

    wayland/seat: Unset resource user data when disabling
    
    We make objects inert when disabling the seat, but we requests may still
    have effect. This is especially bad if disabling is followed by
    destroying, but also means e.g. set_cursor() not doing an early out
    after the pointer capability was disabled.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1822>

 src/wayland/meta-wayland-pointer.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)
---
diff --git a/src/wayland/meta-wayland-pointer.c b/src/wayland/meta-wayland-pointer.c
index dc84293058..3132abfd22 100644
--- a/src/wayland/meta-wayland-pointer.c
+++ b/src/wayland/meta-wayland-pointer.c
@@ -121,21 +121,25 @@ meta_wayland_pointer_client_free (MetaWaylandPointerClient *pointer_client)
     {
       wl_list_remove (wl_resource_get_link (resource));
       wl_list_init (wl_resource_get_link (resource));
+      wl_resource_set_user_data (resource, NULL);
     }
   wl_resource_for_each_safe (resource, next, &pointer_client->swipe_gesture_resources)
     {
       wl_list_remove (wl_resource_get_link (resource));
       wl_list_init (wl_resource_get_link (resource));
+      wl_resource_set_user_data (resource, NULL);
     }
   wl_resource_for_each_safe (resource, next, &pointer_client->pinch_gesture_resources)
     {
       wl_list_remove (wl_resource_get_link (resource));
       wl_list_init (wl_resource_get_link (resource));
+      wl_resource_set_user_data (resource, NULL);
     }
   wl_resource_for_each_safe (resource, next, &pointer_client->relative_pointer_resources)
     {
       wl_list_remove (wl_resource_get_link (resource));
       wl_list_init (wl_resource_get_link (resource));
+      wl_resource_set_user_data (resource, NULL);
     }
 
   g_free (pointer_client);
@@ -200,6 +204,10 @@ meta_wayland_pointer_unbind_pointer_client_resource (struct wl_resource *resourc
   MetaWaylandPointerClient *pointer_client;
   struct wl_client *client = wl_resource_get_client (resource);
 
+  pointer = wl_resource_get_user_data (resource);
+  if (!pointer)
+    return;
+
   wl_list_remove (wl_resource_get_link (resource));
 
   pointer_client = meta_wayland_pointer_get_pointer_client (pointer, client);
@@ -1105,9 +1113,13 @@ pointer_set_cursor (struct wl_client *client,
                     struct wl_resource *surface_resource,
                     int32_t hot_x, int32_t hot_y)
 {
-  MetaWaylandPointer *pointer = wl_resource_get_user_data (resource);
+  MetaWaylandPointer *pointer;
   MetaWaylandSurface *surface;
 
+  pointer = wl_resource_get_user_data (resource);
+  if (!pointer)
+    return;
+
   surface = (surface_resource ? wl_resource_get_user_data (surface_resource) : NULL);
 
   if (pointer->focus_surface == NULL)