This is a note to let you know that I've just added the patch titled
mptcp: reset last_snd on subflow close
to the 5.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mptcp-reset-last_snd-on-subflow-close.patch
and it can be found in the queue-5.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d04fcd890780596c9ccc4949140052e6f27c5cf2
Author: Florian Westphal <fw@xxxxxxxxx>
Date: Thu Mar 4 13:32:08 2021 -0800
mptcp: reset last_snd on subflow close
[ Upstream commit e0be4931f3fee2e04dec4013ea4f27ec2db8556f ]
Send logic caches last active subflow in the msk, so it needs to be
cleared when the cached subflow is closed.
Fixes: d5f49190def61c ("mptcp: allow picking different xmit subflows")
Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/155
Reported-by: Christoph Paasch <cpaasch@xxxxxxxxx>
Acked-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Reviewed-by: Matthieu Baerts <matthieu.baerts@xxxxxxxxxxxx>
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Mat Martineau <mathew.j.martineau@xxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 3cc7be259396..de89824a2a36 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2110,6 +2110,8 @@ static struct sock *mptcp_subflow_get_retrans(const struct mptcp_sock *msk)
void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,
struct mptcp_subflow_context *subflow)
{
+ struct mptcp_sock *msk = mptcp_sk(sk);
+
list_del(&subflow->node);
lock_sock_nested(ssk, SINGLE_DEPTH_NESTING);
@@ -2138,6 +2140,9 @@ void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,
release_sock(ssk);
sock_put(ssk);
+
+ if (ssk == msk->last_snd)
+ msk->last_snd = NULL;
}
static unsigned int mptcp_sync_mss(struct sock *sk, u32 pmtu)
