File 0012-normal-Remove-variables-hooks-on-module-unload.patch of Package grub2.37158

From fe5a2b7ed37c93e17257aad5476c67400f9349d7 Mon Sep 17 00:00:00 2001
From: B Horn <b@horn.uk>
Date: Fri, 1 Nov 2024 23:46:55 +0000
Subject: [PATCH 12/20] normal: Remove variables hooks on module unload

The normal module does not entirely cleanup after itself in
its GRUB_MOD_FINI() leaving a few variables hooks in place.
It is not possible to unload normal module now but fix the
issues for completeness.

On the occasion replace 0s with NULLs for "pager" variable
hooks unregister.

Fixes: CVE-2025-0622

Reported-by: B Horn <b@horn.uk>
Signed-off-by: B Horn <b@horn.uk>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/normal/main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/grub-core/normal/main.c b/grub-core/normal/main.c
index 3e342f787f..1c69970f2e 100644
--- a/grub-core/normal/main.c
+++ b/grub-core/normal/main.c
@@ -599,7 +599,9 @@ GRUB_MOD_FINI(normal)
   grub_xputs = grub_xputs_saved;
 
   grub_set_history (0);
-  grub_register_variable_hook ("pager", 0, 0);
+  grub_register_variable_hook ("pager", NULL, NULL);
+  grub_register_variable_hook ("color_normal", NULL, NULL);
+  grub_register_variable_hook ("color_highlight", NULL, NULL);
   grub_fs_autoload_hook = 0;
   grub_unregister_command (cmd_clear);
 }
-- 
2.48.1