linux-kernel - Re: [PATCH] netfilter: Don't parse CTCP message if shorter than minimum length

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Date:   Wed, 21 Jun 2023 10:44:49 +0200
From:   Florian Westphal <fw@...len.de>
To:     Sohom <sohomdatta1@...il.com>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Sohom <sohomdatta1+git@...il.com>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] netfilter: Don't parse CTCP message if shorter than
 minimum length

Sohom <sohomdatta1@...il.com> wrote:
> If the CTCP message is shorter than 10 + 21 + MINMATCHLEN
> then exit early and don't parse the rest of the message.

Please send a v2 explaining why, not what.

> +	if (data >= data_limit - (10 + 21 + MINMATCHLEN)) {
> +		goto out;
> +	}

Please run your patches through scripts/checkpatch.pl,
we don't use { } for single-line conditional bodies.

>  	/* Skip any whitespace */
> -	while (data < data_limit - 10) {
> +	while (data < data_limit) {

Why this change?