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Date: Thu, 28 Sep 2017 12:16:37 +0200
From: Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [PATCH 1/3] userfaultfd: non-cooperative: fix fork fctx->new
 memleak
Message-ID: <20170928101637.GG30973@redhat.com>
References: <20170302173738.18994-1-aarcange@redhat.com>
 <20170302173738.18994-2-aarcange@redhat.com>
 <CA+1xoqc0W4CXEJ-hXL5=KnzskazR1E2p+rQuEop_Y0tHoanyUA@mail.gmail.com>
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To: Sasha Levin <levinsasha928@gmail.com>
Cc: linux-mm <linux-mm@kvack.org>, Andrew Morton <akpm@linux-foundation.org>, Mike Rapoport <rppt@linux.vnet.ibm.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, Mike Kravetz <mike.kravetz@oracle.com>, Pavel Emelyanov <xemul@parallels.com>, Hillf Danton <hillf.zj@alibaba-inc.com>, alexander.levin@verizon.com

Hello Sasha,

On Thu, Sep 28, 2017 at 02:26:42AM -0700, Sasha Levin wrote:
> On Thu, Mar 2, 2017 at 9:37 AM, Andrea Arcangeli <aarcange@redhat.com> wrote:
> > From: Mike Rapoport <rppt@linux.vnet.ibm.com>
> >
> > We have a memleak in the ->new ctx if the uffd of the parent is closed
> > before the fork event is read, nothing frees the new context.
> 
> Hey Mike,
> 
> This seems to result in the following:

Andrew just included this fix in -mm:

https://lkml.org/lkml/2017/9/20/571

Thanks,
Andrea

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