netdev - [PATCH net-next] net: sched: act_ife: always release ife action on init error

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Message-Id: <1534267796-9841-1-git-send-email-vladbu@mellanox.com>
Date:   Tue, 14 Aug 2018 20:29:56 +0300
From:   Vlad Buslov <vladbu@...lanox.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us, Vlad Buslov <vladbu@...lanox.com>
Subject: [PATCH net-next] net: sched: act_ife: always release ife action on init error

Action init API was changed to always take reference to action, even when
overwriting existing action. Substitute conditional action release, which
was executed only if action is newly created, with unconditional release in
tcf_ife_init() error handling code to prevent double free or memory leak in
case of overwrite.

Fixes: 4e8ddd7f1758 ("net: sched: don't release reference on action overwrite")
Reported-by: Cong Wang <xiyou.wangcong@...il.com>
Signed-off-by: Vlad Buslov <vladbu@...lanox.com>
---
 net/sched/act_ife.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/net/sched/act_ife.c b/net/sched/act_ife.c
index 5d200495e467..c524edcad900 100644
--- a/net/sched/act_ife.c
+++ b/net/sched/act_ife.c
@@ -551,9 +551,6 @@ static int tcf_ife_init(struct net *net, struct nlattr *nla,
 				       NULL, NULL);
 		if (err) {
 metadata_parse_err:
-			if (ret == ACT_P_CREATED)
-				tcf_idr_release(*a, bind);
-
 			if (exists)
 				spin_unlock_bh(&ife->tcf_lock);
 			tcf_idr_release(*a, bind);
@@ -574,11 +571,10 @@ static int tcf_ife_init(struct net *net, struct nlattr *nla,
 		 */
 		err = use_all_metadata(ife);
 		if (err) {
-			if (ret == ACT_P_CREATED)
-				tcf_idr_release(*a, bind);
-
 			if (exists)
 				spin_unlock_bh(&ife->tcf_lock);
+			tcf_idr_release(*a, bind);
+
 			kfree(p);
 			return err;
 		}
-- 
2.7.5