grub2/0231-kern-file-Do-not-leak-device_name-on-error-in-grub_f.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Daniel Axtens <dja@axtens.net>
Date: Fri, 25 Jun 2021 02:19:05 +1000
Subject: [PATCH] kern/file: Do not leak device_name on error in
 grub_file_open()

If we have an error in grub_file_open() before we free device_name, we
will leak it.

Free device_name in the error path and null out the pointer in the good
path once we free it there.

Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
(cherry picked from commit 1499a5068839fa37cb77ecef4b5bdacbd1ed12ea)
(cherry picked from commit 2ec50b289d8b24922433439533113087f111f110)
---
 grub-core/kern/file.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/grub-core/kern/file.c b/grub-core/kern/file.c
index e19aea3e51..ed69fc0f0f 100644
--- a/grub-core/kern/file.c
+++ b/grub-core/kern/file.c
@@ -81,6 +81,7 @@ grub_file_open (const char *name, enum grub_file_type type)
 
   device = grub_device_open (device_name);
   grub_free (device_name);
+  device_name = NULL;
   if (! device)
     goto fail;
 
@@ -135,6 +136,7 @@ grub_file_open (const char *name, enum grub_file_type type)
   return file;
 
  fail:
+  grub_free (device_name);
   if (device)
     grub_device_close (device);