netdev - [PATCH net] bridge: fix br_multicast_query

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Message-ID: <1432813374.16878.5.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 28 May 2015 04:42:54 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	Linus Lüssing <linus.luessing@....de>,
	"Steinar H. Gunderson" <sesse@...fundet.no>,
	Stephen Hemminger <stephen@...workplumber.org>,
	bridge@...ts.linux-foundation.org
Subject: [PATCH net] bridge: fix br_multicast_query_expired() bug

From: Eric Dumazet <edumazet@...gle.com>

br_multicast_query_expired() querier argument is a pointer to
a struct bridge_mcast_querier :

struct bridge_mcast_querier {
        struct br_ip addr;
        struct net_bridge_port __rcu    *port;
};

Intent of the code was to clear port field, not the pointer to querier.

Fixes: 2cd4143192e8 ("bridge: memorize and export selected IGMP/MLD querier port")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Linus Lüssing <linus.luessing@....de>
Cc: Steinar H. Gunderson <sesse@...fundet.no>
---
 net/bridge/br_multicast.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index a3abe6ed111e..22fd0419b314 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1822,7 +1822,7 @@ static void br_multicast_query_expired(struct net_bridge *br,
 	if (query->startup_sent < br->multicast_startup_query_count)
 		query->startup_sent++;
 
-	RCU_INIT_POINTER(querier, NULL);
+	RCU_INIT_POINTER(querier->port, NULL);
 	br_multicast_send_query(br, NULL, query);
 	spin_unlock(&br->multicast_lock);
 }



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