1 files changed, 2 insertions, 1 deletions

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index f701a21acb3..fdbd41c76ec 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -719,7 +719,8 @@ static int br_multicast_add_group(struct net_bridge *br,
                 goto err;
 
         if (!port) {
-                hlist_add_head(&mp->mglist, &br->mglist);
+                if (hlist_unhashed(&mp->mglist))
+                        hlist_add_head(&mp->mglist, &br->mglist);
                 mod_timer(&mp->timer, now + br->multicast_membership_interval);
                 goto out;
         }