File 0005-fs-hfsplus-Set-a-grub_errno-if-mount-fails.patch of Package grub2.37796

From 7a548091bb0f99636a8eafade31a9307c5d773e6 Mon Sep 17 00:00:00 2001
From: B Horn <b@horn.uk>
Date: Sun, 12 May 2024 06:22:51 +0100
Subject: [PATCH 05/20] fs/hfsplus: Set a grub_errno if mount fails

It was possible for mount to fail but not set grub_errno. This led to
a possible double decrement of the module reference count if the NULL
page was mapped.

Fixing in general as a similar bug was fixed in commit 61b13c187
(fs/hfsplus: Set grub_errno to prevent NULL pointer access) and there
are likely more variants around.

Fixes: CVE-2024-45783

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/fs/hfsplus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/grub-core/fs/hfsplus.c b/grub-core/fs/hfsplus.c
index dae43becc9..503a57fbfd 100644
--- a/grub-core/fs/hfsplus.c
+++ b/grub-core/fs/hfsplus.c
@@ -377,7 +377,7 @@ grub_hfsplus_mount (grub_disk_t disk)
 
  fail:
 
-  if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
+  if (grub_errno == GRUB_ERR_OUT_OF_RANGE || grub_errno == GRUB_ERR_NONE)
     grub_error (GRUB_ERR_BAD_FS, "not a HFS+ filesystem");
 
   grub_free (data);
-- 
2.48.1