linux-kernel - Re: [PATCH 4.4 15/39] geneve: pull IP header before ECN decapsulation

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Date:   Thu, 10 Dec 2020 15:32:12 +0100
From:   Eric Dumazet <edumazet@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org,
        syzbot <syzkaller@...glegroups.com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH 4.4 15/39] geneve: pull IP header before ECN decapsulation

On Thu, Dec 10, 2020 at 3:26 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> From: Eric Dumazet <edumazet@...gle.com>
>
> IP_ECN_decapsulate() and IP6_ECN_decapsulate() assume
> IP header is already pulled.
>
> geneve does not ensure this yet.
>
> Fixing this generically in IP_ECN_decapsulate() and
> IP6_ECN_decapsulate() is not possible, since callers
> pass a pointer that might be freed by pskb_may_pull()
>
> syzbot reported :
>

Note that we had to revert this patch, so you can either scratp this
backport, or make sure to backport the revert.

Thanks !