linux-kernel - Re: [PATCH] EDAC/mc: Fix use-after-free and memleaks during device removal

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Message-ID: <20191222172241.t7kquivbvawlbhx6@rric.localdomain>
Date:   Sun, 22 Dec 2019 17:22:48 +0000
From:   Robert Richter <rrichter@...vell.com>
To:     Borislav Petkov <bp@...en8.de>
CC:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        James Morse <james.morse@....com>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        John Garry <john.garry@...wei.com>
Subject: Re: [PATCH] EDAC/mc: Fix use-after-free and memleaks during device
 removal

On 22.12.19 13:15:00, Borislav Petkov wrote:
> On Wed, Dec 18, 2019 at 06:22:08AM +0000, Robert Richter wrote:

> > 1) Use-after-free:
> > 
> > On 27.11.19 17:07:33, John Garry wrote:
> > > [   22.104498] BUG: KASAN: use-after-free in
> > > edac_remove_sysfs_mci_device+0x148/0x180
> > 
> > The use-after-free is triggered in edac_remove_sysfs_mci_device(). It
> > became an issue with commit c498afaf7df8 ("EDAC: Introduce an
> > mci_for_each_dimm() iterator").
> 
> ... which means:
> 
> Fixes: c498afaf7df8 ("EDAC: Introduce an mci_for_each_dimm() iterator")
> 
> ?

Wouldn't say c498afaf7df8 is broken, it is the release code itself.
This patch reveals it. But for patch logistics use the above tag.

-Robert