From 2958695c4cdc785de6ed708709af071a2d20afef Mon Sep 17 00:00:00 2001
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From: Daniel Axtens <dja@axtens.net>
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Date: Thu, 21 Jan 2021 18:54:29 +1100
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Subject: [PATCH] disk/lvm: Bail on missing PV list
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There's an if block for the presence of "physical_volumes {", but if
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that block is absent, then p remains NULL and a NULL-deref will result
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when looking for logical volumes.
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It doesn't seem like LVM makes sense without physical volumes, so error
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out rather than crashing.
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Signed-off-by: Daniel Axtens <dja@axtens.net>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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Signed-off-by: Stefan Sørensen <stefan.sorensen@spectralink.com>
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---
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grub-core/disk/lvm.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/grub-core/disk/lvm.c b/grub-core/disk/lvm.c
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index 36da575..8e560f3 100644
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--- a/grub-core/disk/lvm.c
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+++ b/grub-core/disk/lvm.c
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@@ -370,6 +370,8 @@ grub_lvm_detect (grub_disk_t disk,
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goto fail4;
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}
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}
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+ else
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+ goto fail4;
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p = grub_strstr (p, "logical_volumes {");
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if (p)
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--
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2.14.2
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