linux-kernel - Re: [PATCH 1/2] drm/drm_file: fix use of uninitialized variable

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Message-ID: <20230804135032.GG12951@pendragon.ideasonboard.com>
Date:   Fri, 4 Aug 2023 16:50:32 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Francesco Dolcini <francesco.dolcini@...adex.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] drm/drm_file: fix use of uninitialized variable

On Fri, Aug 04, 2023 at 01:57:39PM +0300, Tomi Valkeinen wrote:
> smatch reports:
> 
> drivers/gpu/drm/drm_file.c:967 drm_show_memory_stats() error: uninitialized symbol 'supported_status'.
> 
> 'supported_status' is only set in one code path. I'm not familiar with
> the code to say if that path will always be ran in real life, but
> whether that is the case or not, I think it is good to initialize
> 'supported_status' to 0 to silence the warning (and possibly fix a bug).
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>

> ---
>  drivers/gpu/drm/drm_file.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c
> index 883d83bc0e3d..cc06e1836bf5 100644
> --- a/drivers/gpu/drm/drm_file.c
> +++ b/drivers/gpu/drm/drm_file.c
> @@ -924,7 +924,7 @@ void drm_show_memory_stats(struct drm_printer *p, struct drm_file *file)
>  {
>  	struct drm_gem_object *obj;
>  	struct drm_memory_stats status = {};
> -	enum drm_gem_object_status supported_status;
> +	enum drm_gem_object_status supported_status = 0;
>  	int id;
>  
>  	spin_lock(&file->table_lock);
> 

-- 
Regards,

Laurent Pinchart