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

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Message-Id: <20230605070158.48403-1-hbh25y@gmail.com>
Date:   Mon,  5 Jun 2023 15:01:58 +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
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH net] net: sched: fix possible refcount leak in tc_chain_tmplt_add()

try_module_get can be called in tcf_proto_lookup_ops. So if ops don't
implement the corresponding function we should call module_put to drop
the refcount.

Fixes: 9f407f1768d3 ("net: sched: introduce chain templates")
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
---
 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 2621550bfddc..92bfb892e638 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -2952,6 +2952,7 @@ static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net,
 		return PTR_ERR(ops);
 	if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) {
 		NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier");
+		module_put(ops->owner);
 		return -EOPNOTSUPP;
 	}
 
-- 
2.34.1