linux-kernel - [PATCH 4.14 003/165] net/sched: fix refcnt leak in the error path of tcf_vlan

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Date:   Thu, 24 May 2018 11:36:49 +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, Roman Mashak <mrv@...atatu.com>,
        Davide Caratti <dcaratti@...hat.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.14 003/165] net/sched: fix refcnt leak in the error path of tcf_vlan_init()

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

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

From: Davide Caratti <dcaratti@...hat.com>

[ Upstream commit 5a4931ae0193f8a4a97e8260fd0df1d705d83299 ]

Similarly to what was done with commit a52956dfc503 ("net sched actions:
fix refcnt leak in skbmod"), fix the error path of tcf_vlan_init() to avoid
refcnt leaks when wrong value of TCA_VLAN_PUSH_VLAN_PROTOCOL is given.

Fixes: 5026c9b1bafc ("net sched: vlan action fix late binding")
CC: Roman Mashak <mrv@...atatu.com>
Signed-off-by: Davide Caratti <dcaratti@...hat.com>
Acked-by: Jamal Hadi Salim <jhs@...atatu.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/sched/act_vlan.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/sched/act_vlan.c
+++ b/net/sched/act_vlan.c
@@ -154,6 +154,8 @@ static int tcf_vlan_init(struct net *net
 			case htons(ETH_P_8021AD):
 				break;
 			default:
+				if (exists)
+					tcf_idr_release(*a, bind);
 				return -EPROTONOSUPPORT;
 			}
 		} else {