[PATCH 3.10 47/70] netfilter: nf_nat: fix oops on netns removal

Greg Kroah-Hartman
2014-11-19T21:17:42Z

From: Florian Westphal <fw@strlen.de>

commit 945b2b2d259d1a4364a2799e80e8ff32f8c6ee6f upstream.

Quoting Samu Kallio:

Basically what's happening is, during netns cleanup,
nf_nat_net_exit gets called before ipv4_net_exit. As I understand
it, nf_nat_net_exit is supposed to kill any conntrack entries which
have NAT context (through nf_ct_iterate_cleanup), but for some
reason this doesn't happen (perhaps something else is still holding
refs to those entries?).

When ipv4_net_exit is called, conntrack entries (including those
with NAT context) are cleaned up, but the
nat_bysource hashtable is long gone - freed in nf_nat_net_exit. The
bug happens when attempting to free a conntrack entry whose NAT hash
'prev' field points to a slot in the freed hash table (head for that
bin).

We ignore conntracks with null nat bindings. But this is wrong,
as these are in bysource hash table as well.

Restore nat-cleaning for the netns-is-being-removed case.

bug:
https://bugzilla.kernel.org/show_bug.cgi?id=65191

Fixes: c2d421e1718 ('netfilter: nf_nat: fix race when unloading protocol modules')
Reported-by: Samu Kallio <samu.kallio@aberdeencloud.com>
Debugged-by: Samu Kallio <samu.kallio@aberdeencloud.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Tested-by: Samu Kallio <samu.kallio@aberdeencloud.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
[samu.kallio@aberdeencloud.com: backport to 3.10-stable]
Signed-off-by: Samu Kallio <samu.kallio@aberdeencloud.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
net/netfilter/nf_nat_core.c | 35 ++++++++++++++++++++++++++++++++++-
1 file changed, 34 insertions(+), 1 deletion(-)

--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -487,6 +487,39 @@ static int nf_nat_proto_remove(struct nf
return i->status & IPS_NAT_MASK ? 1 : 0;
}

+static int nf_nat_proto_clean(struct nf_conn *ct, void *data)
+{
+ struct nf_conn_nat *nat = nfct_nat(ct);
+
+ if (nf_nat_proto_remove(ct, data))
+ return 1;
+
+ if (!nat || !nat->ct)
+ return 0;
+
+ /* This netns is being destroyed, and conntrack has nat null binding.
+ * Remove it from bysource hash, as the table will be freed soon.
+ *
+ * Else, when the conntrack is destoyed, nf_nat_cleanup_conntrack()
+ * will delete entry from already-freed table.
+ */
+ if (!del_timer(&ct->timeout))
+ return 1;
+
+ spin_lock_bh(&nf_nat_lock);
+ hlist_del_rcu(&nat->bysource);
+ ct->status &= ~IPS_NAT_DONE_MASK;
+ nat->ct = NULL;
+ spin_unlock_bh(&nf_nat_lock);
+
+ add_timer(&ct->timeout);
+
+ /* don't delete conntrack. Although that would make things a lot
+ * simpler, we'd end up flushing all conntracks on nat rmmod.
+ */
+ return 0;
+}
+
static void nf_nat_l4proto_clean(u8 l3proto, u8 l4proto)
{
struct nf_nat_proto_clean clean = {
@@ -749,7 +782,7 @@ static void __net_exit nf_nat_net_exit(s
{
struct nf_nat_proto_clean clean = {};

- nf_ct_iterate_cleanup(net, &nf_nat_proto_remove, &clean);
+ nf_ct_iterate_cleanup(net, nf_nat_proto_clean, &clean);
synchronize_rcu();
nf_ct_free_hashtable(net->ct.nat_bysource, net->ct.nat_htable_size);
}