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

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Date:   Thu, 10 Dec 2020 16:36:43 +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 03:53:09PM +0100, Eric Dumazet wrote:
> On Thu, Dec 10, 2020 at 3:40 PM Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> >
> > 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.
> >
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=c02bd115b1d25931159f89c7d9bf47a30f5d4b41

Thanks, I'll drop the patch from 4.4, 4.9, and 4.14, and queue up this
revert for the other trees now.

greg k-h