monmap: fix crash from dup initial seed mons

Fix bug reproduced by

	-m hostname,ip_that_hosthname_resolves_to

Backport: argonaut
Reported-by: Drunkard Zhang <gongfan193@gmail.com>
Signed-off-by: Sage Weil <sage@inktank.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/mon/MonMap.cc b/src/mon/MonMap.cc
index 8d26d41f7b1..5a9d6ce96bd 100644
--- a/src/mon/MonMap.cc
+++ b/src/mon/MonMap.cc
@@ -188,7 +188,9 @@ int MonMap::build_from_host_list(std::string hostlist, std::string prefix)
       addrs[i].set_port(CEPH_MON_PORT);
     string name = prefix;
     name += n;
-    add(name, addrs[i]);
+    if (!contains(addrs[i]) &&
+	!contains(name))
+      add(name, addrs[i]);
   }
   return 0;
 }