linux-kernel - Re: [PATCH] pwm: lp3943: Use of_property_count_u32

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Message-ID: <4uo63ppnjpk6kf3ogzyh4gqukc5nyu3lkwhhgfxhamwlcbji2w@7ft3td4qbgtf>
Date: Fri, 2 Aug 2024 04:06:09 +0200
From: Uwe Kleine-König <u.kleine-koenig@...libre.com>
To: Rob Herring <robh@...nel.org>
Cc: linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pwm: lp3943: Use of_property_count_u32_elems() to get
 property length

Hello Rob,

On Thu, Aug 01, 2024 at 09:52:18AM -0600, Rob Herring wrote:
> On Thu, Aug 1, 2024 at 2:58 AM Uwe Kleine-König
> <u.kleine-koenig@...libre.com> wrote:
> > On Wed, Jul 31, 2024 at 02:14:03PM -0600, Rob Herring (Arm) wrote:
> > > Replace of_get_property() with the type specific
> > > of_property_count_u32_elems() to get the property length.
> > >
> > > This is part of a larger effort to remove callers of of_get_property()
> > > and similar functions. of_get_property() leaks the DT property data
> > > pointer which is a problem for dynamically allocated nodes which may
> > > be freed.
> >
> > To understand that right: The problem is that of_get_property() returns
> > pp->value, which might be freed. In this driver this isn't problematic
> > as the returned value is just used for a NULL check. So this isn't
> > urgent and queuing it for the next merge window is fine, right?
> 
> Yes, 6.12 is fine.

Thanks for confirming, queued in
https://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux.git pwm/for-next
for 6.12-rc.

Best regards
Uwe

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