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netfilter: ipt_CLUSTERIP: put config instead of freeing it 

[ Upstream commit 1a9da59373 ]

Once struct is added to per-netns list it becomes visible to other cpus,
so we cannot use kfree().

Also delay setting entries refcount to 1 until after everything is
initialised so that when we call clusterip_config_put() in this spot
entries is still zero.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Florian Westphal 2018-02-16 12:49:33 +01:00 committed by Greg Kroah-Hartman
parent 596816fabe
commit 84fc57f472
1 changed files with 4 additions and 3 deletions
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7
net/ipv4/netfilter/ipt_CLUSTERIP.c
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@ -228,7 +228,6 @@ clusterip_config_init(struct net *net, const struct ipt_clusterip_tgt_info *i,
c->hash_mode = i->hash_mode;
c->hash_initval = i->hash_initval;
refcount_set(&c->refcount, 1);
refcount_set(&c->entries, 1);
spin_lock_bh(&cn->lock);
if (__clusterip_config_find(net, ip)) {
@ -259,8 +258,10 @@ clusterip_config_init(struct net *net, const struct ipt_clusterip_tgt_info *i,
c->notifier.notifier_call = clusterip_netdev_event;
err = register_netdevice_notifier(&c->notifier);
if (!err)
if (!err) {
refcount_set(&c->entries, 1);
return c;
}
#ifdef CONFIG_PROC_FS
proc_remove(c->pde);
@ -269,7 +270,7 @@ err:
spin_lock_bh(&cn->lock);
list_del_rcu(&c->list);
spin_unlock_bh(&cn->lock);
kfree(c);
clusterip_config_put(c);
return ERR_PTR(err);
}