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authorPablo Neira Ayuso <pablo@netfilter.org>2012-03-06 01:22:55 +0000
committerDavid S. Miller <davem@davemloft.net>2012-03-06 14:43:50 -0500
commit741385119706d4370eb7899c5ca96ad125c520e5 (patch)
treeba34e2f3100a95f11a55bdf3b782169095661e47 /net
parent739e4505a0e8209622dc71743bfa1c804eacf7f4 (diff)
downloadlinux-linaro-stable-741385119706d4370eb7899c5ca96ad125c520e5.tar.gz
netfilter: nf_conntrack: fix early_drop with reliable event delivery
If reliable event delivery is enabled and ctnetlink fails to deliver the destroy event in early_drop, the conntrack subsystem cannot drop any the candidate flow that was planned to be evicted. Reported-by: Kerin Millar <kerframil@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/netfilter/nf_conntrack_core.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index ed86a3be678e..fa4b82c8ae80 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -635,8 +635,12 @@ static noinline int early_drop(struct net *net, unsigned int hash)
if (del_timer(&ct->timeout)) {
death_by_timeout((unsigned long)ct);
- dropped = 1;
- NF_CT_STAT_INC_ATOMIC(net, early_drop);
+ /* Check if we indeed killed this entry. Reliable event
+ delivery may have inserted it into the dying list. */
+ if (test_bit(IPS_DYING_BIT, &ct->status)) {
+ dropped = 1;
+ NF_CT_STAT_INC_ATOMIC(net, early_drop);
+ }
}
nf_ct_put(ct);
return dropped;