linux-kernel - Re: [lvc-project] [PATCH] netfilter: xt_recent: Fix attempt to update removed entry

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Date:   Thu, 9 Feb 2023 16:07:33 +0100
From:   Florian Westphal <fw@...len.de>
To:     Igor Artemiev <Igor.A.Artemiev@...t.ru>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: Re: [lvc-project] [PATCH] netfilter: xt_recent: Fix attempt to
 update removed entry

Igor Artemiev <Igor.A.Artemiev@...t.ru> wrote:
> When both --remove and --update flag are specified, there's a code
> path at which the entry to be updated is removed beforehand,
> that leads to kernel crash. Update entry, if --remove flag
> don't specified.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.

How did you manage to do this?  --update and --remove are supposed
to be mutually exclusive.