netdev - Re: [PATCH] netfilter: nf_tables: fix nft_counters_enabled underflow at nf_tables

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Message-ID: <20220915201948.GA4385@breakpoint.cc>
Date:   Thu, 15 Sep 2022 22:19:48 +0200
From:   Florian Westphal <fw@...len.de>
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        syzbot <syzbot+b5d82a651b71cd8a75ab@...kaller.appspotmail.com>,
        syzkaller-bugs@...glegroups.com, netfilter-devel@...r.kernel.org,
        coreteam@...filter.org,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH] netfilter: nf_tables: fix nft_counters_enabled underflow
 at nf_tables_addchain()

Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> wrote:
> syzbot is reporting underflow of nft_counters_enabled counter at
> nf_tables_addchain() [1], for commit 43eb8949cfdffa76 ("netfilter:
> nf_tables: do not leave chain stats enabled on error") missed that
> nf_tables_chain_destroy() after nft_basechain_init() in the error path of
> nf_tables_addchain() decrements the counter because nft_basechain_init()
> makes nft_is_base_chain() return true by setting NFT_CHAIN_BASE flag.
> 
> Increment the counter immediately after returning from
> nft_basechain_init().

Applied, thanks.