netdev - Re: [MPTCP] [PATCH net 1/2] mptcp: more strict state checking for acks

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Date:   Tue, 12 Jan 2021 13:37:48 -0800 (PST)
From:   Mat Martineau <mathew.j.martineau@...ux.intel.com>
To:     Paolo Abeni <pabeni@...hat.com>
cc:     netdev@...r.kernel.org, mptcp@...ts.01.org,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [MPTCP] [PATCH net 1/2] mptcp: more strict state checking for
 acks

On Tue, 12 Jan 2021, Paolo Abeni wrote:

> Syzkaller found a way to trigger division by zero
> in mptcp_subflow_cleanup_rbuf().
>
> The current checks implemented into tcp_can_send_ack()
> are too week, let's be more accurate.
>
> Reported-by: Christoph Paasch <cpaasch@...le.com>
> Fixes: ea4ca586b16f ("mptcp: refine MPTCP-level ack scheduling")
> Fixes: fd8976790a6c ("mptcp: be careful on MPTCP-level ack.")
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> ---
> net/mptcp/protocol.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>

Reviewed-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>

--
Mat Martineau
Intel