linux-kernel - [PATCH 5.19 074/101] net: sched: act_ct: fix possible refcount leak in tcf_ct

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Date:   Mon,  3 Oct 2022 09:11:10 +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, Hangyu Hua <hbh25y@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 074/101] net: sched: act_ct: fix possible refcount leak in tcf_ct_init()

From: Hangyu Hua <hbh25y@...il.com>

[ Upstream commit 6e23ec0ba92d426c77a73a9ccab16346e5e0ef49 ]

nf_ct_put need to be called to put the refcount got by tcf_ct_fill_params
to avoid possible refcount leak when tcf_ct_flow_table_get fails.

Fixes: c34b961a2492 ("net/sched: act_ct: Create nf flow table per zone")
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
Link: https://lore.kernel.org/r/20220923020046.8021-1-hbh25y@gmail.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/sched/act_ct.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index e013253b10d1..4d44a1bf4a04 100644
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -1393,7 +1393,7 @@ static int tcf_ct_init(struct net *net, struct nlattr *nla,
 
 	err = tcf_ct_flow_table_get(params);
 	if (err)
-		goto cleanup;
+		goto cleanup_params;
 
 	spin_lock_bh(&c->tcf_lock);
 	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
@@ -1408,6 +1408,9 @@ static int tcf_ct_init(struct net *net, struct nlattr *nla,
 
 	return res;
 
+cleanup_params:
+	if (params->tmpl)
+		nf_ct_put(params->tmpl);
 cleanup:
 	if (goto_ch)
 		tcf_chain_put_by_act(goto_ch);
-- 
2.35.1