linux-kernel - Re: [PATCH] drm/ssd130x: Fix possible uninitialized usage of crtc

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Date:   Fri, 27 Oct 2023 10:21:42 +0200
From:   Jocelyn Falempe <jfalempe@...hat.com>
To:     Javier Martinez Canillas <javierm@...hat.com>,
        linux-kernel@...r.kernel.org
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        Maxime Ripard <mripard@...nel.org>,
        dri-devel@...ts.freedesktop.org,
        Dan Carpenter <dan.carpenter@...aro.org>
Subject: Re: [PATCH] drm/ssd130x: Fix possible uninitialized usage of
 crtc_state variable

Hi,

On 21/10/2023 00:52, Javier Martinez Canillas wrote:
> Avoid a possible uninitialized use of the crtc_state variable in function
> ssd132x_primary_plane_atomic_check() and avoid the following Smatch warn:
> 
>      drivers/gpu/drm/solomon/ssd130x.c:921 ssd132x_primary_plane_atomic_check()
>      error: uninitialized symbol 'crtc_state'.

That looks trivial, so you can add:

Acked-by: Jocelyn Falempe <jfalempe@...hat.com>

> 
> Fixes: fdd591e00a9c ("drm/ssd130x: Add support for the SSD132x OLED controller family")
> Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> Closes: https://lore.kernel.org/dri-devel/7dd6ca45-8263-44fe-a318-2fd9d761425d@moroto.mountain/
> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
> ---
> 
>   drivers/gpu/drm/solomon/ssd130x.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c
> index 32f0857aec9f..e0174f82e353 100644
> --- a/drivers/gpu/drm/solomon/ssd130x.c
> +++ b/drivers/gpu/drm/solomon/ssd130x.c
> @@ -910,7 +910,7 @@ static int ssd132x_primary_plane_atomic_check(struct drm_plane *plane,
>   	struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
>   	struct ssd130x_plane_state *ssd130x_state = to_ssd130x_plane_state(plane_state);
>   	struct drm_crtc *crtc = plane_state->crtc;
> -	struct drm_crtc_state *crtc_state;
> +	struct drm_crtc_state *crtc_state = NULL;
>   	const struct drm_format_info *fi;
>   	unsigned int pitch;
>   	int ret;