netdev - Re: [PATCH v2] xfrm: Fix wraparound in xfrm_policy_addr

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Date:   Wed, 30 Dec 2020 19:57:25 +0100
From:   Florian Westphal <fw@...len.de>
To:     Visa Hankala <visa@...kala.org>
Cc:     Florian Westphal <fw@...len.de>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH v2] xfrm: Fix wraparound in xfrm_policy_addr_delta()

Visa Hankala <visa@...kala.org> wrote:
> Use three-way comparison for address components to avoid integer
> wraparound in the result of xfrm_policy_addr_delta(). This ensures
> that the search trees are built and traversed correctly.
> 
> Treat IPv4 and IPv6 similarly by returning 0 when prefixlen == 0.
> Prefix /0 has only one equivalence class.

Acked-by: Florian Westphal <fw@...len.de>