From 91c46e2e60da0b43a1e8740729737318862f64eb Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Tue, 6 Sep 2005 15:10:23 -0700 Subject: [PATCH] [NETFILTER]: Don't increase master refcount on expectations As it's been discussed [1][2]. We shouldn't increase the master conntrack refcount for non-fulfilled conntracks. During the conntrack destruction, the expectations are always killed before the conntrack itself, this guarantees that there won't be any orphan expectation. [1]https://lists.netfilter.org/pipermail/netfilter-devel/2005-August/020783.html [2]https://lists.netfilter.org/pipermail/netfilter-devel/2005-August/020904.html Signed-off-by: Pablo Neira Ayuso Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/ipv4/netfilter/ip_conntrack_core.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/net/ipv4/netfilter/ip_conntrack_core.c b/net/ipv4/netfilter/ip_conntrack_core.c index e23e8ca476c0..babce304c619 100644 --- a/net/ipv4/netfilter/ip_conntrack_core.c +++ b/net/ipv4/netfilter/ip_conntrack_core.c @@ -938,6 +938,9 @@ void ip_conntrack_unexpect_related(struct ip_conntrack_expect *exp) write_unlock_bh(&ip_conntrack_lock); } +/* We don't increase the master conntrack refcount for non-fulfilled + * conntracks. During the conntrack destruction, the expectations are + * always killed before the conntrack itself */ struct ip_conntrack_expect *ip_conntrack_expect_alloc(struct ip_conntrack *me) { struct ip_conntrack_expect *new; @@ -948,17 +951,14 @@ struct ip_conntrack_expect *ip_conntrack_expect_alloc(struct ip_conntrack *me) return NULL; } new->master = me; - atomic_inc(&new->master->ct_general.use); atomic_set(&new->use, 1); return new; } void ip_conntrack_expect_put(struct ip_conntrack_expect *exp) { - if (atomic_dec_and_test(&exp->use)) { - ip_conntrack_put(exp->master); + if (atomic_dec_and_test(&exp->use)) kmem_cache_free(ip_conntrack_expect_cachep, exp); - } } static void ip_conntrack_expect_insert(struct ip_conntrack_expect *exp) -- 2.20.1