linux-kernel - Re: [PATCH 2/2] drm/framebuffer: Fix use of uninitialized variable

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Message-ID: <20230804140650.GH12951@pendragon.ideasonboard.com>
Date:   Fri, 4 Aug 2023 17:06:50 +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 2/2] drm/framebuffer: Fix use of uninitialized variable

On Fri, Aug 04, 2023 at 01:57:40PM +0300, Tomi Valkeinen wrote:
> smatch reports:
> 
> drivers/gpu/drm/drm_framebuffer.c:654 drm_mode_getfb2_ioctl() error: uninitialized symbol 'ret'.
> 
> 'ret' is possibly not set when there are no errors, causing the error
> above. I can't say if that ever happens in real-life, but in any case I
> think it is good to initialize 'ret' to 0.

I don't think it can happen in practice, but tools have no way to know
that.

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

> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
> ---
>  drivers/gpu/drm/drm_framebuffer.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
> index aff3746dedfb..1955eaeba0ab 100644
> --- a/drivers/gpu/drm/drm_framebuffer.c
> +++ b/drivers/gpu/drm/drm_framebuffer.c
> @@ -570,7 +570,7 @@ int drm_mode_getfb2_ioctl(struct drm_device *dev,
>  	struct drm_mode_fb_cmd2 *r = data;
>  	struct drm_framebuffer *fb;
>  	unsigned int i;
> -	int ret;
> +	int ret = 0;
>  
>  	if (!drm_core_check_feature(dev, DRIVER_MODESET))
>  		return -EINVAL;
> 

-- 
Regards,

Laurent Pinchart