linux-kernel - Re: [PATCH v2] net: dccp: delete redundant ackvec record in dccp_insert

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Message-ID: <CANn89iLT+HZKi0JtQA7HtUnMKfDSWBbZ+jeLmCH9kq+-oVxatA@mail.gmail.com>
Date:   Wed, 22 Feb 2023 09:59:58 +0100
From:   Eric Dumazet <edumazet@...gle.com>
To:     Hangyu Hua <hbh25y@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        gerrit@....abdn.ac.uk, ian.mcdonald@...di.co.nz,
        dccp@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: dccp: delete redundant ackvec record in dccp_insert_options()

On Wed, Feb 22, 2023 at 7:25 AM Hangyu Hua <hbh25y@...il.com> wrote:
>
> A useless record can be insert into av_records when dccp_insert_options()
> fails after dccp_insert_option_ackvec(). Repeated triggering may cause
> av_records to have a lot of useless record with the same avr_ack_seqno.

Do you have a repro for this bug ?
It is not clear if this can actually happen.
Presumably skb are sized so that they can hold all possible standard
DCCP options.
DCCP_MAX_OPT_LEN is 992 bytes.

Fact that your first patch was not even compiled is not giving us a good signal.