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netfilter: conntrack: fix removal of conntrack entries when l4tracker is removed 

nf_ct_l4proto_unregister_one() leaves conntracks added by
to-be-removed tracker behind, nf_ct_l4proto_unregister has to iterate
for each protocol to be removed.

v2: call nf_ct_iterate_destroy without holding nf_ct_proto_mutex.

Fixes: 2c41f33c1b ("netfilter: move table iteration out of netns exit paths")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2018-08-02 12:30:09 +02:00 committed by Pablo Neira Ayuso
parent 6a48de0144
commit 1c117d3b72
1 changed files with 10 additions and 5 deletions
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15
net/netfilter/nf_conntrack_proto.c
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@ -312,7 +312,9 @@ void nf_ct_l4proto_unregister_one(const struct nf_conntrack_l4proto *l4proto)
__nf_ct_l4proto_unregister_one(l4proto);
mutex_unlock(&nf_ct_proto_mutex);
synchronize_rcu();
synchronize_net();
/* Remove all contrack entries for this protocol */
nf_ct_iterate_destroy(kill_l4proto, (void *)l4proto);
}
EXPORT_SYMBOL_GPL(nf_ct_l4proto_unregister_one);
@ -333,14 +335,17 @@ static void
nf_ct_l4proto_unregister(const struct nf_conntrack_l4proto * const l4proto[],
unsigned int num_proto)
{
int i;
mutex_lock(&nf_ct_proto_mutex);
while (num_proto-- != 0)
__nf_ct_l4proto_unregister_one(l4proto[num_proto]);
for (i = 0; i < num_proto; i++)
__nf_ct_l4proto_unregister_one(l4proto[i]);
mutex_unlock(&nf_ct_proto_mutex);
synchronize_net();
/* Remove all contrack entries for this protocol */
nf_ct_iterate_destroy(kill_l4proto, (void *)l4proto);
for (i = 0; i < num_proto; i++)
nf_ct_iterate_destroy(kill_l4proto, (void *)l4proto[i]);
}
static int