linux-kernel - Re: [PATCH v2] backlight: mp3309c: fix uninitialized local variable

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Date:   Wed, 29 Nov 2023 11:53:02 -0500
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Flavio Suligoi <f.suligoi@...m.it>
Cc:     Lee Jones <lee@...nel.org>, Jingoo Han <jingoohan1@...il.com>,
        Helge Deller <deller@....de>,
        Dan Carpenter <dan.carpenter@...aro.org>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] backlight: mp3309c: fix uninitialized local variable

On Wed, Nov 29, 2023 at 05:45:14PM +0100, Flavio Suligoi wrote:
> In the function "pm3309c_parse_dt_node", when the dimming analog control
> mode (by I2C messages) is enabled, the local variable "prop_levels" is
> tested without any initialization, as indicated by the following smatch
> warning:
>
> drivers/video/backlight/mp3309c.c:279 pm3309c_parse_dt_node() error: uninitialized symbol 'prop_levels'.
>
> To avoid any problem in case of undefined behavior, we need to initialize
> it to "NULL".
>
> Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> Closes: https://lore.kernel.org/dri-devel/af0a1870-693b-442f-9b11-0503cfcd944a@moroto.mountain/
> Fixes: 2e914516a58c ("backlight: mp3309c: Add support for MPS MP3309C")
> Signed-off-by: Flavio Suligoi <f.suligoi@...m.it>

Reviewed-by: Daniel Thompson <daniel.thompson@...aro.org>


Daniel.