linux-kernel - Re: [PATCH v2] net/sched: mqprio: Add length check for TCA_MQPRIO_{MAX/MIN}

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Message-ID: <2d346050-3b6f-e9ec-10bb-99447c88fdf7@user.com>
Date:   Mon, 24 Jul 2023 18:29:50 -0300
From:   Victor Nogueira <victor.nogueira.rio@...il.com>
To:     Lin Ma <linma@....edu.cn>, jhs@...atatu.com,
        xiyou.wangcong@...il.com, jiri@...nulli.us, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net/sched: mqprio: Add length check for
 TCA_MQPRIO_{MAX/MIN}_RATE64

On 23/07/2023 22:46, Lin Ma wrote:
> The nla_for_each_nested parsing in function mqprio_parse_nlattr() does
> not check the length of the nested attribute. This can lead to an
> out-of-attribute read and allow a malformed nlattr (e.g., length 0) to
> be viewed as 8 byte integer and passed to priv->max_rate/min_rate.
> 
> This patch adds the check based on nla_len() when check the nla_type(),
> which ensures that the length of these two attribute must equals
> sizeof(u64).
> 
> Fixes: 4e8b86c06269 ("mqprio: Introduce new hardware offload mode and shaper in mqprio")
> Signed-off-by: Lin Ma <linma@....edu.cn>

Reviewed-by: Victor Nogueira <victor@...atatu.com>