From e375394fb9233fb1da13f7fb38e38d8aa83d1443 Mon Sep 17 00:00:00 2001
From: Steve McIntyre <steve@einval.com>
Date: Tue, 6 Dec 2022 01:45:11 +0000
Subject: kern/file: Fix error handling in grub_file_open()

grub_file_open() calls grub_file_get_device_name(), but doesn't check
the return. Instead, it checks if grub_errno is set.

However, nothing initialises grub_errno here when grub_file_open()
starts. This means that trying to open one file that doesn't exist and
then trying to open another file that does will (incorrectly) also
fail to open that second file.

Let's fix that.

Reference:https://git.savannah.gnu.org/cgit/grub.git/commit?id=e375394fb9233fb1da13f7fb38e38d8aa83d1443
Conflict:NA

Signed-off-by: Steve McIntyre <steve@einval.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/kern/file.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/grub-core/kern/file.c b/grub-core/kern/file.c
index ed69fc0..70b3c62 100644
--- a/grub-core/kern/file.c
+++ b/grub-core/kern/file.c
@@ -66,6 +66,9 @@ grub_file_open (const char *name, enum grub_file_type type)
   const char *file_name;
   grub_file_filter_id_t filter;
 
+  /* Reset grub_errno before we start. */
+  grub_errno = GRUB_ERR_NONE;
+
   grub_dprintf ("file", "Opening `%s' ...\n", name);
 
   device_name = grub_file_get_device_name (name);
-- 
2.19.1