linux-kernel - Re: [PATCH][next] netfilter: nf_tables: Fix dereference of null pointer flow

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Date:   Fri, 25 Jun 2021 12:21:13 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Walter Harms <wharms@....de>
Cc:     Colin King <colin.king@...onical.com>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
        "coreteam@...filter.org" <coreteam@...filter.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] netfilter: nf_tables: Fix dereference of null
 pointer flow

On Fri, Jun 25, 2021 at 10:06:26AM +0000, Walter Harms wrote:
> hi Colin,
> most free_something_functions accept NULL
> these days, perhaps it would be more efficient
> to add a check in nft_flow_rule_destroy().
> There is a chance that this will catch the same
> mistake in future  also.

I'm fine with Colin patch.

Thanks.