linux-kernel - Re: [PATCH v2] vmw_balloon: fixing double free when batching mode is off

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Date:   Thu, 19 Apr 2018 08:38:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Nadav Amit <namit@...are.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Xavier Deguillard <xdeguillard@...are.com>,
        pv-drivers <pv-drivers@...are.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Gil Kupfer <gilkup@...il.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "ldu@...hat.com" <ldu@...hat.com>,
        Oleksandr Natalenko <oleksandr@...hat.com>
Subject: Re: [PATCH v2] vmw_balloon: fixing double free when batching mode is
 off

On Wed, Apr 18, 2018 at 05:54:21PM +0000, Nadav Amit wrote:
> Oleksandr Natalenko <oleksandr@...hat.com> wrote:
> 
> > Hello.
> > 
> > On Fri, Mar 23, 2018 at 9:42 AM, Oleksandr Natalenko
> > <oleksandr@...hat.com> wrote:
> >>> Actually, rechecking the bug description, I might have rushed. The bug that
> >>> I encountered is related to the vunmap() but it is only caused when batching
> >>> is off, while the bug you reported has batching on.
> >>> 
> >>> It seems that your sources support batching but do not include b91f108a3d54
> >>> (“VMware balloon: Treat init like reset”), which I think would have solved
> >>> the problem. I don’t see a mainline kernel that supports batching and does
> >>> not have this patch, so it would be helpful to see the exact module that you
> >>> use.
> >> 
> >> Correct. The hash is d7568c130d0d0ff1fc5b364fc879b91f108a3d54, actually, though.
> >> Yes, we miss this commit in our code base, but also we've already
> >> provided a test kernel
> >> with this commit included to the customer. Unfortunately, we have no answer yet.
> > 
> > At least for one customer I can confirm that the kernel built with
> > both d7568c130 and the proposed patch fixes the issue.
> 
> Greg,
> 
> Can you commit please this patch? Preferably for 4.17?
> 
> There is one minor mistake in the commit message - this patch fixes
> f220a80f0c2e and not as written. Please let me know if you want a v3 or can
> amend it while committing.

Please resend, never make a maintainer have to hand-edit a patch.

thanks,

greg k-h