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[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>
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@ -938,6 +938,9 @@ void ip_conntrack_unexpect_related(struct ip_conntrack_expect *exp)
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write_unlock_bh(&ip_conntrack_lock);
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}
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/* We don't increase the master conntrack refcount for non-fulfilled
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* conntracks. During the conntrack destruction, the expectations are
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* always killed before the conntrack itself */
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struct ip_conntrack_expect *ip_conntrack_expect_alloc(struct ip_conntrack *me)
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{
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struct ip_conntrack_expect *new;
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@ -948,17 +951,14 @@ struct ip_conntrack_expect *ip_conntrack_expect_alloc(struct ip_conntrack *me)
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return NULL;
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}
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new->master = me;
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atomic_inc(&new->master->ct_general.use);
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atomic_set(&new->use, 1);
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return new;
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}
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void ip_conntrack_expect_put(struct ip_conntrack_expect *exp)
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{
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if (atomic_dec_and_test(&exp->use)) {
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ip_conntrack_put(exp->master);
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if (atomic_dec_and_test(&exp->use))
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kmem_cache_free(ip_conntrack_expect_cachep, exp);
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}
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}
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static void ip_conntrack_expect_insert(struct ip_conntrack_expect *exp)
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