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

[Sasha Levin]

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@xxxxxxxxxxxxxxxxxxxxx>
> >
> > [ 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