linux-kernel - [PATCH 4.14 144/496] netfilter: ipt_CLUSTERIP: put config struct if we cant increment ct refcount

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Message-Id: <20180528100325.980698105@linuxfoundation.org>
Date:   Mon, 28 May 2018 11:58:49 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Florian Westphal <fw@...len.de>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 144/496] netfilter: ipt_CLUSTERIP: put config struct if we cant increment ct refcount

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Florian Westphal <fw@...len.de>

[ Upstream commit 8ae56822812ddedc26a152ab1916eb30120b4748 ]

This needs to put() the entry to avoid a resource leak in error path.

Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv4/netfilter/ipt_CLUSTERIP.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/net/ipv4/netfilter/ipt_CLUSTERIP.c
+++ b/net/ipv4/netfilter/ipt_CLUSTERIP.c
@@ -492,12 +492,15 @@ static int clusterip_tg_check(const stru
 				return PTR_ERR(config);
 		}
 	}
-	cipinfo->config = config;
 
 	ret = nf_ct_netns_get(par->net, par->family);
-	if (ret < 0)
+	if (ret < 0) {
 		pr_info("cannot load conntrack support for proto=%u\n",
 			par->family);
+		clusterip_config_entry_put(par->net, config);
+		clusterip_config_put(config);
+		return ret;
+	}
 
 	if (!par->net->xt.clusterip_deprecated_warning) {
 		pr_info("ipt_CLUSTERIP is deprecated and it will removed soon, "
@@ -505,6 +508,7 @@ static int clusterip_tg_check(const stru
 		par->net->xt.clusterip_deprecated_warning = true;
 	}
 
+	cipinfo->config = config;
 	return ret;
 }