linux-kernel - Re: [PATCH net v2] net/sched: flower: fix possible OOB write in fl_set_geneve

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Message-ID: <a849499f-ac42-aafd-f848-3166a8f26328@amd.com>
Date:   Thu, 1 Jun 2023 09:24:10 +0100
From:   Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@....com>
To:     Hangyu Hua <hbh25y@...il.com>, jhs@...atatu.com,
        xiyou.wangcong@...il.com, jiri@...nulli.us, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        simon.horman@...igine.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v2] net/sched: flower: fix possible OOB write in
 fl_set_geneve_opt()



On 31/05/2023 11:28, Hangyu Hua wrote:
> If we send two TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets and their total
> size is 252 bytes(key->enc_opts.len = 252) then
> key->enc_opts.len = opt->length = data_len / 4 = 0 when the third
> TCA_FLOWER_KEY_ENC_OPTS_GENEVE packet enters fl_set_geneve_opt. This
> bypasses the next bounds check and results in an out-of-bounds.
> 
> Fixes: 0a6e77784f49 ("net/sched: allow flower to match tunnel options")
> Signed-off-by: Hangyu Hua <hbh25y@...il.com>

Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@....com>