From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Daniel Axtens <dja@axtens.net>
Date: Thu, 21 Jan 2021 18:54:29 +1100
Subject: [PATCH] disk/lvm: Bail on missing PV list

There's an if block for the presence of "physical_volumes {", but if
that block is absent, then p remains NULL and a NULL-deref will result
when looking for logical volumes.

It doesn't seem like LVM makes sense without physical volumes, so error
out rather than crashing.

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

diff --git a/grub-core/disk/lvm.c b/grub-core/disk/lvm.c
index 7a8d61ffb20..939afa17d28 100644
--- a/grub-core/disk/lvm.c
+++ b/grub-core/disk/lvm.c
@@ -371,6 +371,8 @@ error_parsing_metadata:
 	      goto fail4;
 	    }
 	}
+      else
+        goto fail4;
 
       p = grub_strstr (p, "logical_volumes {");
       if (p)