mptcp: fix snd_wnd initialization for passive socket

commit adf1bb78dab55e36d4d557aa2fb446ebcfe9e5ce upstream.

Such value should be inherited from the first subflow, but
passive sockets always used 'rsk_rcv_wnd'.

Fixes: 6f8a612a33e4 ("mptcp: keep track of advertised windows right edge")
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://lore.kernel.org/r/20240223-upstream-net-20240223-misc-fixes-v1-5-162e87e48497@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 5b953e26a5866a389b5de54d182311a398ad5e00..5f4019b1ddf12d8f286741a4c5f64a3f99f9422a 100644 (file)
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -3220,7 +3220,7 @@ struct sock *mptcp_sk_clone_init(const struct sock *sk,
        msk->write_seq = subflow_req->idsn + 1;
        msk->snd_nxt = msk->write_seq;
        msk->snd_una = msk->write_seq;
-       msk->wnd_end = msk->snd_nxt + req->rsk_rcv_wnd;
+       msk->wnd_end = msk->snd_nxt + tcp_sk(ssk)->snd_wnd;
        msk->setsockopt_seq = mptcp_sk(sk)->setsockopt_seq;
        mptcp_init_sched(msk, mptcp_sk(sk)->sched);