From 91c46e2e60da0b43a1e8740729737318862f64eb Mon Sep 17 00:00:00 2001
From: Pablo Neira Ayuso <pablo@netfilter.org>
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 <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
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)
--
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