linux-kernel - Re: [PATCH AUTOSEL 5.8 14/29] regmap: debugfs: Fix handling of name string for debugfs init delays

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Date:   Sun, 4 Oct 2020 08:54:29 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Charles Keepax <ckeepax@...nsource.cirrus.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH AUTOSEL 5.8 14/29] regmap: debugfs: Fix handling of name
 string for debugfs init delays

On Tue, Sep 29, 2020 at 08:33:34AM +0000, Charles Keepax wrote:
>On Mon, Sep 28, 2020 at 09:30:11PM -0400, Sasha Levin wrote:
>> From: Charles Keepax <ckeepax@...nsource.cirrus.com>
>>
>> [ Upstream commit 94cc89eb8fa5039fcb6e3e3d50f929ddcccee095 ]
>>
>> In regmap_debugfs_init the initialisation of the debugfs is delayed
>> if the root node isn't ready yet. Most callers of regmap_debugfs_init
>> pass the name from the regmap_config, which is considered temporary
>> ie. may be unallocated after the regmap_init call returns. This leads
>> to a potential use after free, where config->name has been freed by
>> the time it is used in regmap_debugfs_initcall.
>>
>
>Afraid this patch had some issues if you are back porting it you
>definitely need to take these two patches as well:
>
>commit 1d512ee861b80da63cbc501b973c53131aa22f29
>regmap: debugfs: Fix more error path regressions

Looks like 1d512ee861b is queued for the merge window even though it's a
bugfix for this release?

I'm going to drop this patch.

-- 
Thanks,
Sasha