FIX: Prevent using null list pointer

When not all attributes are supported (attributes incompatibility)
function container_content_imsm returns NULL pointer.
We need to cope with a NULL list better.

Reported-by: Lukasz Dorau <lukasz.dorau@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/policy.c b/policy.c
index ebb14814..2bbbac86 100644
--- a/policy.c
+++ b/policy.c
@@ -678,6 +678,8 @@ struct domainlist *domain_from_array(struct mdinfo *mdi, const char *metadata)
 {
 	struct domainlist *domlist = NULL;
 
+	if (!mdi)
+		return NULL;
 	for (mdi = mdi->devs ; mdi ; mdi = mdi->next)
 		domainlist_add_dev(&domlist, makedev(mdi->disk.major,
 						     mdi->disk.minor),