From ecdd2aeb85efe95a8a149788f77f05a102e3c3c8 Mon Sep 17 00:00:00 2001
From: Simon McVittie <smcv@debian.org>
Date: Sun, 18 Dec 2022 15:54:55 +0000
Subject: [PATCH] workspace: Don't crash on invalid argument to
 meta_workspace_index

Mitigates: https://gitlab.gnome.org/GNOME/mutter/-/issues/2559
Mitigates: https://bugs.debian.org/1024438
Signed-off-by: Simon McVittie <smcv@debian.org>
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2774>
---
 src/core/workspace.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/core/workspace.c b/src/core/workspace.c
index 5acc33420..2e626c0b5 100644
--- a/src/core/workspace.c
+++ b/src/core/workspace.c
@@ -704,7 +704,10 @@ meta_workspace_index (MetaWorkspace *workspace)
 {
   int ret;
 
+  g_return_val_if_fail (META_IS_WORKSPACE (workspace), -1);
+
   ret = g_list_index (workspace->manager->workspaces, workspace);
+
   g_return_val_if_fail (ret >= 0, -1);
 
   return ret;