super0: fix crash on assemble if homehost is not set.

[thirdparty/mdadm.git] / super0.c

diff --git a/super0.c b/super0.c
index 3f02ed403435bcaf4c5196e931539627c7ba8495..07f47924eae0bbbe15be9ef5a09ea5b518c7a980 100644 (file)
--- a/super0.c
+++ b/super0.c
@@ -1,7 +1,7 @@
 /*
  * mdadm - manage Linux "md" devices aka RAID arrays.
  *
- * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
+ * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
  *
  *
  *    This program is free software; you can redistribute it and/or modify
@@ -19,12 +19,7 @@
  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  *    Author: Neil Brown
- *    Email: <neilb@cse.unsw.edu.au>
- *    Paper: Neil Brown
- *           School of Computer Science and Engineering
- *           The University of New South Wales
- *           Sydney, 2052
- *           Australia
+ *    Email: <neilb@suse.de>
  */
 
 #define HAVE_STDINT_H 1
@@ -310,9 +305,13 @@ static int match_home0(struct supertype *st, char *homehost)
 {
        mdp_super_t *sb = st->sb;
        char buf[20];
-       char *hash = sha1_buffer(homehost,
-                                strlen(homehost),
-                                buf);
+       char *hash;
+
+       if (!homehost)
+               return 0;
+       hash = sha1_buffer(homehost,
+                          strlen(homehost),
+                          buf);
 
        return (memcmp(&sb->set_uuid2, hash, 8)==0);
 }