The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x adf1bb78dab55e36d4d557aa2fb446ebcfe9e5ce # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024030417-jaws-icky-a0f2@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

adf1bb78dab5 ("mptcp: fix snd_wnd initialization for passive socket")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From adf1bb78dab55e36d4d557aa2fb446ebcfe9e5ce Mon Sep 17 00:00:00 2001 From: Paolo Abeni pabeni@redhat.com Date: Fri, 23 Feb 2024 17:14:15 +0100 Subject: [PATCH] mptcp: fix snd_wnd initialization for passive socket

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-v1-5-162... Signed-off-by: Jakub Kicinski kuba@kernel.org

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 442fa7d9b57a..2c8f931c6d5b 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -3211,7 +3211,7 @@ 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);