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From:   Matthieu Baerts <matthieu.baerts@tessares.net>
Date:   Fri, 11 Aug 2023 17:57:16 +0200
Subject: [PATCH net-next 03/14] mptcp: avoid subflow socket usage in
 mptcp_get_port()
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References: <20230811-upstream-net-next-20230811-mptcp-get-rid-of-msk-subflow-v1-0-36183269ade8@tessares.net>
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To:     mptcp@lists.linux.dev, Mat Martineau <martineau@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        David Ahern <dsahern@kernel.org>
Cc:     netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Matthieu Baerts <matthieu.baerts@tessares.net>
Precedence: bulk

From: Paolo Abeni <pabeni@redhat.com>

We are going to remove the first subflow socket soon, so avoid
accessing it in mptcp_get_port(). Instead, access directly the
first subflow sock.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
---
 net/mptcp/protocol.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index b888d6339c80..891f49722263 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -3405,14 +3405,12 @@ static void mptcp_unhash(struct sock *sk)
 static int mptcp_get_port(struct sock *sk, unsigned short snum)
 {
 	struct mptcp_sock *msk = mptcp_sk(sk);
-	struct socket *ssock;
 
-	ssock = msk->subflow;
-	pr_debug("msk=%p, subflow=%p", msk, ssock);
-	if (WARN_ON_ONCE(!ssock))
+	pr_debug("msk=%p, ssk=%p", msk, msk->first);
+	if (WARN_ON_ONCE(!msk->first))
 		return -EINVAL;
 
-	return inet_csk_get_port(ssock->sk, snum);
+	return inet_csk_get_port(msk->first, snum);
 }
 
 void mptcp_finish_connect(struct sock *ssk)

-- 
2.40.1