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Date: Tue, 28 Feb 2017 16:55:49 +0100
From: Andrea Arcangeli <aarcange@redhat.com>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Dmitry Vyukov <dvyukov@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Jan Kara <jack@suse.cz>, ross.zwisler@linux.intel.com,
        Michal Hocko <mhocko@suse.com>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        syzkaller <syzkaller@googlegroups.com>
Subject: Re: mm: fault in __do_fault
Message-ID: <20170228155549.GJ5816@redhat.com>
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 <20170228153220.GA30524@node.shutemov.name>
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On Tue, Feb 28, 2017 at 06:32:20PM +0300, Kirill A. Shutemov wrote:
> Andrea, does it look okay for you?
> 
> diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
> index 625b7285a37b..56f61f1a1dc1 100644
> --- a/fs/userfaultfd.c
> +++ b/fs/userfaultfd.c
> @@ -489,7 +489,7 @@ int handle_userfault(struct vm_fault *vmf, unsigned long reason)
>                          * in such case.
>                          */
>                         down_read(&mm->mmap_sem);
> -                       ret = 0;
> +                       ret = VM_FAULT_NOPAGE;
>                 }
>         }

Yes, I did the same fix.