[mutter] wayland/pointer-constraints: Reject invalid lifetime

[Jonas Ådahl <jadahl src gnome org>]

commit 7719e33e68da9ea3b8105f7a557ab7fb24b9ddf8
Author: Vasilis Liaskovitis <vliaskovitis suse com>
Date:   Wed May 22 16:15:34 2019 +0200

    wayland/pointer-constraints: Reject invalid lifetime
    
    https://gitlab.gnome.org/GNOME/mutter/issues/425

 src/wayland/meta-wayland-pointer-constraints.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)
---
diff --git a/src/wayland/meta-wayland-pointer-constraints.c b/src/wayland/meta-wayland-pointer-constraints.c
index a33b672f1..aa59dbcb4 100644
--- a/src/wayland/meta-wayland-pointer-constraints.c
+++ b/src/wayland/meta-wayland-pointer-constraints.c
@@ -862,6 +862,19 @@ init_pointer_constraint (struct wl_resource                      *resource,
       return;
     }
 
+  switch (lifetime)
+    {
+    case ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_ONESHOT:
+    case ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_PERSISTENT:
+      break;
+
+    default:
+      wl_resource_post_error (resource,
+                              WL_DISPLAY_ERROR_INVALID_OBJECT,
+                              "Invalid constraint lifetime");
+      return;
+    }
+
   constraint = meta_wayland_pointer_constraint_new (surface, seat,
                                                     region,
                                                     lifetime,