linux-kernel - [PATCH v2] net: sched: fix possible refcount leak in tc_new

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Message-Id: <20220921092734.31700-1-hbh25y@gmail.com>
Date:   Wed, 21 Sep 2022 17:27:34 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, vladbu@...lanox.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hangyu Hua <hbh25y@...il.com>, Vlad Buslov <vladbu@...dia.com>
Subject: [PATCH v2] net: sched: fix possible refcount leak in tc_new_tfilter()

tfilter_put need to be called to put the refount got by tp->ops->get to
avoid possible refcount leak when chain->tmplt_ops != NULL and
chain->tmplt_ops != tp->ops.

Fixes: 7d5509fa0d3d ("net: sched: extend proto ops with 'put' callback")
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
Reviewed-by: Vlad Buslov <vladbu@...dia.com>
---

v2: fix a description error

 net/sched/cls_api.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 790d6809be81..51d175f3fbcb 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -2137,6 +2137,7 @@ static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
 	}
 
 	if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) {
+		tfilter_put(tp, fh);
 		NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind");
 		err = -EINVAL;
 		goto errout;
-- 
2.34.1