diff -Nru mdadm-3.2.5/debian/changelog mdadm-3.2.5/debian/changelog
--- mdadm-3.2.5/debian/changelog	2016-05-18 22:49:31.000000000 +0000
+++ mdadm-3.2.5/debian/changelog	2017-10-09 14:06:22.000000000 +0000
@@ -1,3 +1,11 @@
+mdadm (3.2.5-5ubuntu4.4) trusty; urgency=medium
+
+  * Prevent segfault when get_md_name() returns NULL
+    This fixes mdadm segfaults when running inside a container.
+    (LP: #1617919)
+
+ -- Dan Streetman <dan.streetman@canonical.com>  Mon, 09 Oct 2017 10:06:22 -0400
+
 mdadm (3.2.5-5ubuntu4.3) trusty; urgency=medium
 
   * debian/source_mdadm.py: fix bytes versus strings mismatch that
diff -Nru mdadm-3.2.5/debian/patches/mdadm-monitor-fix-nullptr-dereference-when-get_md_na.patch mdadm-3.2.5/debian/patches/mdadm-monitor-fix-nullptr-dereference-when-get_md_na.patch
--- mdadm-3.2.5/debian/patches/mdadm-monitor-fix-nullptr-dereference-when-get_md_na.patch	1970-01-01 00:00:00.000000000 +0000
+++ mdadm-3.2.5/debian/patches/mdadm-monitor-fix-nullptr-dereference-when-get_md_na.patch	2017-10-09 14:06:22.000000000 +0000
@@ -0,0 +1,41 @@
+From: Sergey Vidishev <sergeyv@yandex-team.ru>
+Subject: mdadm: monitor: fix nullptr dereference when get_md_name() returns NULL
+Origin: https://github.com/neilbrown/mdadm/commit/1e08717f0b7856b389e9d5eb2dc330d146636183
+Bug-Ubuntu: https://bugs.launchpad.net/bugs/1617919
+
+Function add_new_arrays() expects that function get_md_name() should
+return pointer to devname, but also get_md_name() may return NULL. So
+check the pointer before use it in add_new_arrays().
+
+Signed-off-by: Sergey Vidishev <sergeyv@yandex-team.ru>
+Signed-off-by: NeilBrown <neilb@suse.de>
+---
+ Monitor.c | 10 +++++++++-
+ 1 file changed, 9 insertions(+), 1 deletion(-)
+
+--- a/Monitor.c
++++ b/Monitor.c
+@@ -677,6 +677,7 @@
+ {
+ 	struct mdstat_ent *mse;
+ 	int new_found = 0;
++	char *name;
+ 
+ 	for (mse=mdstat; mse; mse=mse->next)
+ 		if (mse->devnum != INT_MAX &&
+@@ -689,7 +690,14 @@
+ 			int fd;
+ 			if (st == NULL)
+ 				continue;
+-			st->devname = strdup(get_md_name(mse->devnum));
++
++			name = get_md_name(mse->devnum);
++			if (!name) {
++				free(st);
++				continue;
++			}
++
++			st->devname = strdup(name);
+ 			if ((fd = open(st->devname, O_RDONLY)) < 0 ||
+ 			    ioctl(fd, GET_ARRAY_INFO, &array)< 0) {
+ 				/* no such array */
diff -Nru mdadm-3.2.5/debian/patches/series mdadm-3.2.5/debian/patches/series
--- mdadm-3.2.5/debian/patches/series	2014-02-17 13:44:06.000000000 +0000
+++ mdadm-3.2.5/debian/patches/series	2017-10-09 14:06:22.000000000 +0000
@@ -12,3 +12,4 @@
 mdmon-fix-arg-parsing.patch
 mdmon-fix-arg-processing-for-a.patch
 dmraid-fallback.patch
+mdadm-monitor-fix-nullptr-dereference-when-get_md_na.patch