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Date:   Thu, 29 Oct 2020 01:48:15 +0200
From:   Vladimir Oltean <>
To:     Roopa Prabhu <>,
        Nikolay Aleksandrov <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,,,
Subject: [PATCH net-next] net: bridge: explicitly convert between mdb entry state and port group flags

When creating a new multicast port group, there is implicit conversion
between the __u8 state member of struct br_mdb_entry and the unsigned
char flags member of struct net_bridge_port_group. This implicit
conversion relies on the fact that MDB_PERMANENT is equal to

Let's be more explicit and convert the state to flags manually.

Signed-off-by: Vladimir Oltean <>
 net/bridge/br_mdb.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index 3c8863418d0b..8846c5bcd075 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -846,6 +846,7 @@ static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
 	struct net_bridge_port_group __rcu **pp;
 	struct br_ip group, star_group;
 	unsigned long now = jiffies;
+	unsigned char flags = 0;
 	u8 filter_mode;
 	int err;
@@ -904,7 +905,10 @@ static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
 	filter_mode = br_multicast_is_star_g(&group) ? MCAST_EXCLUDE :
-	p = br_multicast_new_port_group(port, &group, *pp, entry->state, NULL,
+	if (entry->state == MDB_PERMANENT)
+	p = br_multicast_new_port_group(port, &group, *pp, flags, NULL,
 					filter_mode, RTPROT_STATIC);
 	if (unlikely(!p)) {
 		NL_SET_ERR_MSG_MOD(extack, "Couldn't allocate new port group");

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