netdev - [PATCH net] rtnetlink: fix netns leak with rtnl

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Message-ID: <20250205221037.2474426-1-nicolas.dichtel@6wind.com>
Date: Wed,  5 Feb 2025 23:10:37 +0100
From: Nicolas Dichtel <nicolas.dichtel@...nd.com>
To: "David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Kuniyuki Iwashima <kuniyu@...zon.com>
Cc: Simon Horman <horms@...nel.org>,
	Nikolay Aleksandrov <razor@...ckwall.org>,
	netdev@...r.kernel.org,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	stable@...r.kernel.org
Subject: [PATCH net] rtnetlink: fix netns leak with rtnl_setlink()

A call to rtnl_nets_destroy() is needed to release references taken on
netns put in rtnl_nets.

CC: stable@...r.kernel.org
Fixes: 636af13f213b ("rtnetlink: Register rtnl_dellink() and rtnl_setlink() with RTNL_FLAG_DOIT_PERNET_WIP.")
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
---
 net/core/rtnetlink.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 1f4d4b5570ab..d1e559fce918 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -3432,6 +3432,7 @@ static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 		err = -ENODEV;
 
 	rtnl_nets_unlock(&rtnl_nets);
+	rtnl_nets_destroy(&rtnl_nets);
 errout:
 	return err;
 }
-- 
2.47.1