From 5955a69bc4281d159a19424917382aa32faa6e95 Mon Sep 17 00:00:00 2001
From: Daniel Axtens <dja@axtens.net>
Date: Mon, 11 Jan 2021 16:57:37 +1100
Subject: [PATCH] commands/ls: Require device_name is not NULL before printing

This can be triggered with:
  ls -l (0 0*)
and causes a NULL deref in grub_normal_print_device_info().

I'm not sure if there's any implication with the IEEE 1275 platform.

Reference: http://git.savannah.gnu.org/cgit/grub.git/commit/?id=6afbe6063c95b827372f9ec310c9fc7461311eb1

Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/commands/ls.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/grub-core/commands/ls.c b/grub-core/commands/ls.c
index 5b7491a..326d2d6 100644
--- a/grub-core/commands/ls.c
+++ b/grub-core/commands/ls.c
@@ -196,7 +196,7 @@ grub_ls_list_files (char *dirname, int longlist, int all, int human)
       goto fail;
     }
 
-  if (! *path)
+  if (! *path && device_name)
     {
       if (grub_errno == GRUB_ERR_UNKNOWN_FS)
 	grub_errno = GRUB_ERR_NONE;
-- 
2.19.1

