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 ec3545e16..1e80137c4 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)