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

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Message-ID: <X9IzaHjsIjcn3XNX@kroah.com>
Date:   Thu, 10 Dec 2020 15:40:40 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Eric Dumazet <edumazet@...gle.com>
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 03:38:44PM +0100, Greg Kroah-Hartman wrote:
> On Thu, Dec 10, 2020 at 03:32:12PM +0100, Eric Dumazet wrote:
> > 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.
> 
> I'll drop it thanks.  Odd I lost the upstream git id on this patch, let
> me check what went wrong...

What is the git id of the revert?  This ended up already in 4.19.y,
5.4.y, and 5.9.y so needs to be reverted there.

thanks,

greg k-h