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

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Message-ID: <20210702005648.GC29227@salvia>
Date:   Fri, 2 Jul 2021 02:56:48 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Colin King <colin.king@...onical.com>
Cc:     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, coreteam@...filter.org,
        netdev@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] netfilter: nf_tables: Fix dereference of null
 pointer flow

On Thu, Jun 24, 2021 at 08:57:18PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> In the case where chain->flags & NFT_CHAIN_HW_OFFLOAD is false then
> nft_flow_rule_create is not called and flow is NULL. The subsequent
> error handling execution via label err_destroy_flow_rule will lead
> to a null pointer dereference on flow when calling nft_flow_rule_destroy.
> Since the error path to err_destroy_flow_rule has to cater for null
> and non-null flows, only call nft_flow_rule_destroy if flow is non-null
> to fix this issue.

Applied, thanks.