File mdmon-0.9-superblock-crash.patch of Package mdadm.import4757

From c4dc5c0aa7aa412bf85f0f6d646ea0c307eb4591 Mon Sep 17 00:00:00 2001
From: Michal Marek <mmarek@suse.cz>
Date: Fri, 19 Mar 2010 11:59:20 +0100
Subject: [PATCH] mdmon: Fix crash if /proc/mdstat lists 0.9 superblocks

Signed-off-by: Michal Marek <mmarek@suse.cz>
================================================================================
--- mdadm-3.1.4/mdmon.c
+++ mdadm-3.1.4/mdmon.c
@@ -300,7 +300,8 @@
 		/* launch an mdmon instance for each container found */
 		mdstat = mdstat_read(0, 0);
 		for (e = mdstat; e; e = e->next) {
-			if (strncmp(e->metadata_version, "external:", 9) == 0 &&
+			if (e->metadata_version &&
+			    strncmp(e->metadata_version, "external:", 9) == 0 &&
 			    !is_subarray(&e->metadata_version[9])) {
 				devname = devnum2devname(e->devnum);
 				/* update cmdline so this mdmon instance can be