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[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>
This commit is contained in:
Stephen Hemminger 2006-05-25 15:09:37 -07:00 committed by David S. Miller
parent 29efcd2666
commit 23dbe7912d
1 changed files with 5 additions and 2 deletions
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7
net/llc/llc_input.c
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@ -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);