[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 <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/llc/llc_input.c b/net/llc/llc_input.c
index d62e0f9..cb9f7f0 100644
--- a/net/llc/llc_input.c
+++ b/net/llc/llc_input.c
@@ -142,6 +142,8 @@
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 @@
* 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);