netfilter 01/04: conntrack: don't deliver events for racy packets

[Patrick McHardy <kaber@trash.net>]

commit b1e93a68ca41e7e73766f95ba32ca05cf9052e15
Author: Pablo Neira Ayuso <pablo@netfilter.org>
Date:   Mon Mar 16 15:06:42 2009 +0100

    netfilter: conntrack: don't deliver events for racy packets
    
    This patch skips the delivery of conntrack events if the packet
    was drop due to a race condition in the conntrack insertion.
    
    Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
    Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/include/net/netfilter/nf_conntrack_core.h b/include/net/netfilter/nf_conntrack_core.h
index c25068e..5a449b4 100644
--- a/include/net/netfilter/nf_conntrack_core.h
+++ b/include/net/netfilter/nf_conntrack_core.h
@@ -62,7 +62,8 @@ static inline int nf_conntrack_confirm(struct sk_buff *skb)
 	if (ct && ct != &nf_conntrack_untracked) {
 		if (!nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct))
 			ret = __nf_conntrack_confirm(skb);
-		nf_ct_deliver_cached_events(ct);
+		if (likely(ret == NF_ACCEPT))
+			nf_ct_deliver_cached_events(ct);
 	}
 	return ret;
 }