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

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Message-ID: <20230724160214.424573ac@kernel.org>
Date:   Mon, 24 Jul 2023 16:02:14 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Lin Ma <linma@....edu.cn>
Cc:     jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        davem@...emloft.net, edumazet@...gle.com, 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 Mon, 24 Jul 2023 09:46:25 +0800 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).

How do you run get_maintainer? You didn't CC the author of the code.