From: Florian Westphal <fw@strlen.de>
Date: Fri, 16 Feb 2018 11:49:33 +0000 (+0100)
Subject: netfilter: ipt_CLUSTERIP: put config instead of freeing it
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=84fc57f472f9fcf42ba3ef27734694d1a2a75b23;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

netfilter: ipt_CLUSTERIP: put config instead of freeing it

[ Upstream commit 1a9da5937386dbe553ffcf6c65d985bd48c347c5 ]

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>
---

diff --git a/net/ipv4/netfilter/ipt_CLUSTERIP.c b/net/ipv4/netfilter/ipt_CLUSTERIP.c
index 171e74471a23..cc7c9d67ac19 100644
--- a/net/ipv4/netfilter/ipt_CLUSTERIP.c
+++ b/net/ipv4/netfilter/ipt_CLUSTERIP.c
@@ -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);
 }