netdev - [PATCH net] net/sched: fix refcnt leak in the error path of tcf_vlan

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Message-Id: <b2e7cfab172461a824959d683d8c868fe04119a3.1526467698.git.dcaratti@redhat.com>
Date:   Wed, 16 May 2018 12:54:29 +0200
From:   Davide Caratti <dcaratti@...hat.com>
To:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Jiri Pirko <jiri@...nulli.us>
Cc:     Jamal Hadi Salim <jhs@...atatu.com>,
        Roman Mashak <mrv@...atatu.com>
Subject: [PATCH net] net/sched: fix refcnt leak in the error path of tcf_vlan_init()

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>
---
 net/sched/act_vlan.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/sched/act_vlan.c b/net/sched/act_vlan.c
index 853604685965..1fb39e1f9d07 100644
--- a/net/sched/act_vlan.c
+++ b/net/sched/act_vlan.c
@@ -161,6 +161,8 @@ static int tcf_vlan_init(struct net *net, struct nlattr *nla,
 			case htons(ETH_P_8021AD):
 				break;
 			default:
+				if (exists)
+					tcf_idr_release(*a, bind);
 				return -EPROTONOSUPPORT;
 			}
 		} else {
-- 
2.17.0