From 3ef383aa9616e183cb1eda38fdbe4d7a2ebdfd4c Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@intel.com>
Date: Tue, 4 Aug 2009 10:17:23 -0700
Subject: [PATCH] Assemble: fix handling of empty container

# mdadm --create /dev/md/ddf /dev/sd[b-e] -n 4 -e ddf
mdadm: container /dev/md/ddf prepared.
# mdadm -Ss
mdadm: stopped /dev/md126
# mdadm -As
mdadm: Container /dev/md/ddf0 has been assembled with 4 drives
Segmentation fault

Reported-by: Artur Wojcik <artur.wojcik@intel.com>
Reported-by: Jacek Danecki <jacek.danecki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 Assemble.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Assemble.c b/Assemble.c
index 3c3a004f..4578906e 100644
--- a/Assemble.c
+++ b/Assemble.c
@@ -320,6 +320,8 @@ int Assemble(struct supertype *st, char *mddev,
 				content = tmpdev->content;
 			else
 				content = tst->ss->container_content(tst);
+			if (!content)
+				goto loop; /* empty container */
 
 			tmpdev->content = content->next;
 			if (tmpdev->content == NULL)
-- 
2.47.2