linux-kernel - Re: [PATCH stable 4.9] mm: memcontrol: fix NULL pointer crash in test_clear_page

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Date:   Wed, 10 Feb 2021 15:06:49 +0100
From:   Greg KH <greg@...ah.com>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Florian Fainelli <f.fainelli@...il.com>, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jaegeuk Kim <jaegeuk@...nel.org>,
        Bradley Bolen <bradleybolen@...il.com>,
        Vladimir Davydov <vdavydov@...tuozzo.com>,
        Michal Hocko <mhocko@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Prakash Gupta <guptap@...eaurora.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        "open list:CONTROL GROUP - MEMORY RESOURCE CONTROLLER (MEMCG)" 
        <cgroups@...r.kernel.org>,
        "open list:CONTROL GROUP - MEMORY RESOURCE CONTROLLER (MEMCG)" 
        <linux-mm@...ck.org>
Subject: Re: [PATCH stable 4.9] mm: memcontrol: fix NULL pointer crash in
 test_clear_page_writeback()

On Tue, Feb 09, 2021 at 04:19:46PM -0500, Johannes Weiner wrote:
> On Tue, Feb 09, 2021 at 12:26:15PM -0800, Florian Fainelli wrote:
> > From: Johannes Weiner <hannes@...xchg.org>
> > 
> > commit 739f79fc9db1b38f96b5a5109b247a650fbebf6d upstream
> 
> ...
> 
> > This patch is present in a downstream Android tree:
> > 
> > https://source.mcwhirter.io/craige/bluecross/commit/d4a742865c6b69ef931694745ef54965d7c9966c
> > 
> > and I happened to have stumbled across the same problem too.
> > 
> > Johannes can you review it for correctness with respect to the 4.9
> > kernel? Thanks!
> 
> Looks good to me.

Applied, thanks.

greg k-h