linux-kernel - RE: [PATCH] backlight: mp3309c: fix signedness bug in mp3309c_parse

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Date: Mon, 18 Mar 2024 11:18:20 +0000
From: FLAVIO SULIGOI <f.suligoi@...m.it>
To: 'Dan Carpenter' <dan.carpenter@...aro.org>, Andy Shevchenko
	<andriy.shevchenko@...ux.intel.com>
CC: Lee Jones <lee@...nel.org>, Daniel Thompson <daniel.thompson@...aro.org>,
	Jingoo Han <jingoohan1@...il.com>, Helge Deller <deller@....de>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: RE: [PATCH] backlight: mp3309c: fix signedness bug in
 mp3309c_parse_fwnode()

Hi Dan,

> The "num_levels" variable is used to store error codes from
> device_property_count_u32() so it needs to be signed.  This doesn't cause an
> issue at runtime because devm_kcalloc() won't allocate negative sizes.
> However, it's still worth fixing.
> 
> Fixes: b54c828bdba9 ("backlight: mp3309c: Make use of device properties")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>

I've just tested on my board with the mp3309c chip, all is ok.
Thanks!

Tested-by: Flavio Suligoi <f.suligoi@...m.it>