From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001

From: Daniel Axtens <dja@axtens.net>

Date: Fri, 22 Jan 2021 14:42:21 +1100

Subject: [PATCH] disk/lvm: Do not allow a LV to be it's own segment's node's

 LV

This prevents infinite recursion in the diskfilter verification code.

Signed-off-by: Daniel Axtens <dja@axtens.net>

Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

---

 grub-core/disk/lvm.c | 10 +++++++---

 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/grub-core/disk/lvm.c b/grub-core/disk/lvm.c

index 9eda28d85..7e86bb7df 100644

--- a/grub-core/disk/lvm.c

+++ b/grub-core/disk/lvm.c

@@ -840,9 +840,13 @@ error_parsing_metadata:

 		    }

 		if (lv1->segments[i].nodes[j].pv == NULL)

 		  for (lv2 = vg->lvs; lv2; lv2 = lv2->next)

-		    if (grub_strcmp (lv2->name,

-				     lv1->segments[i].nodes[j].name) == 0)

-		      lv1->segments[i].nodes[j].lv = lv2;

+		    {

+		      if (lv1 == lv2)

+		        continue;

+		      if (grub_strcmp (lv2->name,

+				       lv1->segments[i].nodes[j].name) == 0)

+			lv1->segments[i].nodes[j].lv = lv2;

+		    }

 	      }

       }