[PATCH] FIX: Prevent using null list pointer

When not all attributes are supported (attributes incompatibility)
function container_content_imsm returns NULL pointer.
In this case mdadm should immediately exit with error to prevent
using null "list" pointer.

Signed-off-by: Lukasz Dorau <redacted>
---
 Incremental.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/Incremental.c b/Incremental.c
index 951c2a0..deace7d 100644
--- a/Incremental.c
+++ b/Incremental.c

@@ -1460,6 +1460,11 @@ static int Incremental_container(struct supertype *st, char *devname,
 		trustworthy = FOREIGN;
 
 	list = st->ss->container_content(st, NULL);
+	if (!list) {
+		fprintf(stderr, Name ": Cannot get container content. "
+				"Array cannot be assembled.\n");
+		return 2;
+	}
 	if (map_lock(&map))
 		fprintf(stderr, Name ": failed to get exclusive lock on "
 			"mapfile\n");

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