linux-kernel - Re: [lvc-project] [PATCH] netfilter: ebtables: remove unnecessary NULL check

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Message-ID: <20230620163806.GB3799@breakpoint.cc>
Date:   Tue, 20 Jun 2023 18:38:06 +0200
From:   Florian Westphal <fw@...len.de>
To:     Igor Artemiev <Igor.A.Artemiev@...t.ru>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S . Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: Re: [lvc-project] [PATCH] netfilter: ebtables: remove unnecessary
 NULL check

Igor Artemiev <Igor.A.Artemiev@...t.ru> wrote:
> In ebt_do_table() 'private->chainstack' cannot be NULL
> and the 'cs' pointer is dereferenced below, so it does not make
> sense to compare 'private->chainstack' with NULL. 

?  Why do you think that?

> +	cs = private->chainstack[smp_processor_id()];

Looks like NULL deref to me.  Did you test this?