From 23dbe7912dad6be71bb9e69cb819d05e2442d362 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Thu, 25 May 2006 15:09:37 -0700 Subject: [LLC]: use rcu_dereference on receive handler The receive hander pointer might be modified during network changes of protocol. So use rcu_dereference (only matters on alpha). Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- net/llc/llc_input.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/net/llc/llc_input.c b/net/llc/llc_input.c index d62e0f9b9da3..cb9f7f058f75 100644 --- a/net/llc/llc_input.c +++ b/net/llc/llc_input.c @@ -142,6 +142,8 @@ int llc_rcv(struct sk_buff *skb, struct net_device *dev, struct llc_sap *sap; struct llc_pdu_sn *pdu; int dest; + int (*rcv)(struct sk_buff *, struct net_device *, + struct packet_type *, struct net_device *); /* * When the interface is in promisc. mode, drop all the crap that it @@ -169,8 +171,9 @@ int llc_rcv(struct sk_buff *skb, struct net_device *dev, * First the upper layer protocols that don't need the full * LLC functionality */ - if (sap->rcv_func) { - sap->rcv_func(skb, dev, pt, orig_dev); + rcv = rcu_dereference(sap->rcv_func); + if (rcv) { + rcv(skb, dev, pt, orig_dev); goto out_put; } dest = llc_pdu_type(skb); -- cgit v1.2.3-59-g8ed1b