From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jiri Slaby <jslaby@suse.cz>
Subject: Re: copy_huge_page: unable to handle kernel NULL pointer dereference
 at 0000000000000008
Date: Tue, 31 Mar 2015 11:45:59 +0200
Message-ID: <551A6CD7.3040901@suse.cz>
References: <CABYiri9MEbEnZikqTU3d=w6rxtsgumH2gJ++Qzi1yZKGn6it+Q@mail.gmail.com> <20150224001228.GA11456@amt.cnet> <CABYiri_U7oB==4-cxegjVQJ_dX62d0tX=D0cUAPTpV_xjCukEw@mail.gmail.com> <alpine.LSU.2.11.1503281705040.13543@eggly.anvils>
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Cc: Dave Hansen <dave.hansen@intel.com>,
	Greg KH <gregkh@linuxfoundation.org>,
	Luis Henriques <luis.henriques@canonical.com>,
	Marcelo Tosatti <mtosatti@redhat.com>, stable@vger.kernel.org,
	linux-mm@kvack.org, kvm@vger.kernel.org,
	wanpeng.li@linux.intel.com, jipan yang <jipan.yang@gmail.com>
To: Hugh Dickins <hughd@google.com>, Andrey Korolyov <andrey@xdel.ru>
Return-path: <stable-owner@vger.kernel.org>
In-Reply-To: <alpine.LSU.2.11.1503281705040.13543@eggly.anvils>
Sender: stable-owner@vger.kernel.org
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On 03/29/2015, 01:25 AM, Hugh Dickins wrote:
> But you are very appositely mistaken: copy_huge_page() used to make
> the same mistake, and Dave Hansen fixed it back in v3.13, but the fix
> never went to the stable trees.
> 
> Your report was on an Ubuntu "3.11.0-15" kernel: I think Ubuntu have
> discontinued their 3.11-stable kernel series, but 3.10-longterm and
> 3.12-longterm would benefit from including this fix.  I haven't tried
> patching and  building and testing it there, but it looks reasonable.
> 
> Hugh
> 
> commit 30b0a105d9f7141e4cbf72ae5511832457d89788
> Author: Dave Hansen <dave.hansen@linux.intel.com>
> Date:   Thu Nov 21 14:31:58 2013 -0800
> 
>     mm: thp: give transparent hugepage code a separate copy_page

Applied to 3.12. Thanks.

-- 
js
suse labs