From: Matthieu Baerts <matttbe@kernel.org>
To: quanyeyang@proton.me, MPTCP Linux <mptcp@lists.linux.dev>
Cc: stable@vger.kernel.org, Tao Cui <cui.tao@linux.dev>
Subject: Re: [PATCH mptcp-net] mptcp: pm: cap userspace extra_subflows at U8_MAX
Date: Wed, 2 Sep 2026 18:36:41 +0200 [thread overview]
Message-ID: <5bfa969b-fd91-4797-a0ba-100762233ea6@kernel.org> (raw)
In-Reply-To: <20260902-mptcp-pm-extra-subflows-v1-1-68540a866e5a@proton.me>
Hi Quanye,
+cc Tao
On 02/09/2026 17:39, Quanye Yang via B4 Relay wrote:
> From: Quanye Yang <quanyeyang@proton.me>
>
> The userspace PM increments extra_subflows with no upper bound. The
> field is a u8, so the 256th extra subflow wraps the counter to 0 and
> the next close hits WARN_ON_ONCE().
>
> Refuse admission at U8_MAX for incoming MP_JOIN and for the Netlink
> create path.
Thank you for the patch. It looks like Tao already addresses the same
issues, see:
https://lore.kernel.org/20260831093206.689827-1-cui.tao@linux.dev
Do you mind syncing with him, please?
Cheers,
Matt
--
Sponsored by the NGI0 Core fund.
next prev parent reply other threads:[~2026-09-02 16:36 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-02 15:39 [PATCH mptcp-net] mptcp: pm: cap userspace extra_subflows at U8_MAX Quanye Yang
2026-09-02 15:39 ` Quanye Yang via B4 Relay
2026-09-02 15:49 ` sashiko-bot
2026-09-02 16:36 ` Matthieu Baerts [this message]
2026-09-02 16:52 ` Matthieu Baerts
2026-09-02 17:02 ` MPTCP CI
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