linux-kernel - Re: [PATCH 20/27] ACPICA: Tables: Fix invalid pointer accesses in acpi_tb_parse_root

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Date:	Mon, 5 May 2014 08:42:46 -0400
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	"Zheng, Lv" <lv.zheng@...el.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Lv Zheng <zetalog@...il.com>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"Brown, Len" <len.brown@...el.com>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"Moore, Robert" <robert.moore@...el.com>
Subject: Re: [PATCH 20/27] ACPICA: Tables: Fix invalid pointer accesses in acpi_tb_parse_root_table().

On Mon, May 5, 2014 at 12:23 AM, Zheng, Lv <lv.zheng@...el.com> wrote:
> Hi, Rafael
>
>> From: linux-acpi-owner@...r.kernel.org [mailto:linux-acpi-owner@...r.kernel.org] On Behalf Of Rafael J. Wysocki
>> Sent: Monday, May 05, 2014 8:43 AM
>>
>> On Saturday, May 03, 2014 08:59:14 AM Josh Boyer wrote:
>> > On Tue, Apr 29, 2014 at 10:05 PM, Lv Zheng <lv.zheng@...el.com> wrote:
>> > > The commit of back porting Linux XSDT validation mechanism has introduced
>> > > a regreession:
>> > >   Commit: 671cc68dc61f029d44b43a681356078e02d8dab8
>> > >   Subject: ACPICA: Back port and refine validation of the XSDT root table.
>> > > There is a pointer still accessed after unmapping.
>> > >
>> > > This patch fixes this issue.  Lv Zheng.
>> > >
>> > > Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=73911
>> > > Buglink: https://bugs.archlinux.org/task/39811
>> > > Signed-off-by: Lv Zheng <lv.zheng@...el.com>
>> > > Reported-and-tested-by: Bruce Chiarelli <mano155@...il.com>
>> > > Reported-and-tested-by: Spyros Stathopoulos <spystath@...il.com>
>> > > Signed-off-by: Bob Moore <robert.moore@...el.com>
>> > > Cc: <stable@...r.kernel.org> # 3.14.x: 671cc68: ACPICA: Back port and refine validation of the XSDT root table.
>> >
>> > This patch should get into 3.15-rcX soon.  It fixes a known regression
>> > that prevents booting on machines with AMI firmware, and that is
>> > present in 3.14 so we need it for stable as well.  Rafael?
>>
>> Lv, is it safe to take this patch alone into 3.15-rc?
>
> Yes, it's safe to only take this patch to be a regression fix.

FWIW, Fedora is carrying this on top of 3.14.2 already, and people
with the impacted machines say it's working for them.  So I agree it
should be safe.

Thanks to the both of you.

josh
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