linux-kernel - Re: [PATCH v2] netfilter: conntrack: fix calculation of next bucket number in early

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Date:   Sat, 3 Nov 2018 14:16:20 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Vasily Khoruzhick <vasilykh@...sta.com>
Cc:     Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dmitry Safonov <dima@...sta.com>, stable@...r.kernel.org
Subject: Re: [PATCH v2] netfilter: conntrack: fix calculation of next bucket
 number in early_drop

On Thu, Oct 25, 2018 at 12:15:43PM -0700, Vasily Khoruzhick wrote:
> If there's no entry to drop in bucket that corresponds to the hash,
> early_drop() should look for it in other buckets. But since it increments
> hash instead of bucket number, it actually looks in the same bucket 8
> times: hsize is 16k by default (14 bits) and hash is 32-bit value, so
> reciprocal_scale(hash, hsize) returns the same value for hash..hash+7 in
> most cases.
> 
> Fix it by increasing bucket number instead of hash and rename _hash
> to bucket to avoid future confusion.

Applied, thanks.