linux-kernel - [PATCH net 0/2] mptcp: fix warn on bad status

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Message-Id: <20251212-net-mptcp-subflow_data_ready-warn-v1-0-d1f9fd1c36c8@kernel.org>
Date: Fri, 12 Dec 2025 13:54:02 +0100
From: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
To: Mat Martineau <martineau@...nel.org>, Geliang Tang <geliang@...nel.org>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>, Kuniyuki Iwashima <kuniyu@...gle.com>, 
 Dmytro Shytyi <dmytro@...tyi.net>
Cc: Evan Li <evan.li@...ux.alibaba.com>, kitta <kitta@...ux.alibaba.com>, 
 netdev@...r.kernel.org, mptcp@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 "Matthieu Baerts (NGI0)" <matttbe@...nel.org>, stable@...r.kernel.org, 
 syzbot+0ff6b771b4f7a5bce83b@...kaller.appspotmail.com
Subject: [PATCH net 0/2] mptcp: fix warn on bad status

Two somewhat related fixes addressing different issues found by
syzkaller, and producing the exact same splat: a WARNING in
subflow_data_ready().

- Patch 1: fallback earlier on simultaneous connections to avoid a
  warning. A fix for v5.19.

- Patch 2: ensure context reset on disconnect, also to avoid a similar
  warning. A fix for v6.2.

Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
---
Paolo Abeni (2):
      mptcp: fallback earlier on simult connection
      mptcp: ensure context reset on disconnect()

 net/mptcp/options.c  | 10 ++++++++++
 net/mptcp/protocol.c |  8 +++++---
 net/mptcp/protocol.h |  9 ++++-----
 net/mptcp/subflow.c  |  6 ------
 4 files changed, 19 insertions(+), 14 deletions(-)
---
base-commit: 885bebac9909994050bbbeed0829c727e42bd1b7
change-id: 20251212-net-mptcp-subflow_data_ready-warn-fd8126208c90

Best regards,
-- 
Matthieu Baerts (NGI0) <matttbe@...nel.org>