From 859828c0ea476b42f3a93d69d117aaba90994b6f Mon Sep 17 00:00:00 2001 From: Jiri Pirko Date: Thu, 5 Dec 2013 16:27:37 +0100 Subject: br: fix use of ->rx_handler_data in code executed on non-rx_handler path br_stp_rcv() is reached by non-rx_handler path. That means there is no guarantee that dev is bridge port and therefore simple NULL check of ->rx_handler_data is not enough. There is need to check if dev is really bridge port and since only rcu read lock is held here, do it by checking ->rx_handler pointer. Note that synchronize_net() in netdev_rx_handler_unregister() ensures this approach as valid. Introduced originally by: commit f350a0a87374418635689471606454abc7beaa3a "bridge: use rx_handler_data pointer to store net_bridge_port pointer" Fixed but not in the best way by: commit b5ed54e94d324f17c97852296d61a143f01b227a "bridge: fix RCU races with bridge port" Reintroduced by: commit 716ec052d2280d511e10e90ad54a86f5b5d4dcc2 "bridge: fix NULL pointer deref of br_port_get_rcu" Please apply to stable trees as well. Thanks. RH bugzilla reference: https://bugzilla.redhat.com/show_bug.cgi?id=1025770 Reported-by: Laine Stump Debugged-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin Signed-off-by: Jiri Pirko Acked-by: Michael S. Tsirkin Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- net/bridge/br_stp_bpdu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/bridge/br_stp_bpdu.c') diff --git a/net/bridge/br_stp_bpdu.c b/net/bridge/br_stp_bpdu.c index 8660ea3be705..bdb459d21ad8 100644 --- a/net/bridge/br_stp_bpdu.c +++ b/net/bridge/br_stp_bpdu.c @@ -153,7 +153,7 @@ void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, if (buf[0] != 0 || buf[1] != 0 || buf[2] != 0) goto err; - p = br_port_get_rcu(dev); + p = br_port_get_check_rcu(dev); if (!p) goto err; -- cgit v1.2.3-59-g8ed1b