From 0000000000000000000000000000000000000000 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.

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 0eaf8365279..7df04565561 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;