netdev - [PATCH v3] net: openvswitch: fix possible memory leak in ovs_meter_cmd

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Message-Id: <20230210020551.6682-1-hbh25y@gmail.com>
Date:   Fri, 10 Feb 2023 10:05:51 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     pshelar@....org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, xiangxia.m.yue@...il.com,
        simon.horman@...igine.com, echaudro@...hat.com
Cc:     netdev@...r.kernel.org, dev@...nvswitch.org,
        linux-kernel@...r.kernel.org, Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH v3] net: openvswitch: fix possible memory leak in ovs_meter_cmd_set()

old_meter needs to be free after it is detached regardless of whether
the new meter is successfully attached.

Fixes: c7c4c44c9a95 ("net: openvswitch: expand the meters supported number")
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
---

v2: use goto label and free old_meter outside of ovs lock.

v3: add the label and keep the lock in place.

 net/openvswitch/meter.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/openvswitch/meter.c b/net/openvswitch/meter.c
index 6e38f68f88c2..f2698d2316df 100644
--- a/net/openvswitch/meter.c
+++ b/net/openvswitch/meter.c
@@ -449,7 +449,7 @@ static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info *info)
 
 	err = attach_meter(meter_tbl, meter);
 	if (err)
-		goto exit_unlock;
+		goto exit_free_old_meter;
 
 	ovs_unlock();
 
@@ -472,6 +472,8 @@ static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info *info)
 	genlmsg_end(reply, ovs_reply_header);
 	return genlmsg_reply(reply, info);
 
+exit_free_old_meter:
+	ovs_meter_free(old_meter);
 exit_unlock:
 	ovs_unlock();
 	nlmsg_free(reply);
-- 
2.34.1