Commit 23dbe791 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller
Browse files

[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: default avatarStephen Hemminger <shemminger@osdl.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 29efcd26
......@@ -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);
......
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