linux-kernel - Re: [PATCH next] drm/v3d: Fix missing error code in v3d_submit_cpu

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Date:   Mon, 4 Dec 2023 13:50:59 -0100
From:   Melissa Wen <mwen@...lia.com>
To:     Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
Cc:     Emma Anholt <emma@...olt.net>,
        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>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        dan.carpenter@...aro.org, kernel-janitors@...r.kernel.org,
        error27@...il.com
Subject: Re: [PATCH next] drm/v3d: Fix missing error code in
 v3d_submit_cpu_ioctl()

On 12/04, Harshit Mogalapalli wrote:
> Smatch warns:
> 	drivers/gpu/drm/v3d/v3d_submit.c:1222 v3d_submit_cpu_ioctl()
> 	warn: missing error code 'ret'
> 
> When there is no job type or job is submitted with wrong number of BOs
> it is an error path, ret is zero at this point which is incorrect
> return.
> 
> Fix this by changing it to -EINVAL.
> 
> Fixes: aafc1a2bea67 ("drm/v3d: Add a CPU job submission")
> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
> ---
> This is based on static analysis and only compile tested.
> ---
>  drivers/gpu/drm/v3d/v3d_submit.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/v3d/v3d_submit.c b/drivers/gpu/drm/v3d/v3d_submit.c
> index d7a9da2484fd..fcff41dd2315 100644
> --- a/drivers/gpu/drm/v3d/v3d_submit.c
> +++ b/drivers/gpu/drm/v3d/v3d_submit.c
> @@ -1219,11 +1219,13 @@ v3d_submit_cpu_ioctl(struct drm_device *dev, void *data,
>  	/* Every CPU job must have a CPU job user extension */
>  	if (!cpu_job->job_type) {
>  		DRM_DEBUG("CPU job must have a CPU job user extension.\n");
> +		ret = -EINVAL;
>  		goto fail;
>  	}
>  
>  	if (args->bo_handle_count != cpu_job_bo_handle_count[cpu_job->job_type]) {
>  		DRM_DEBUG("This CPU job was not submitted with the proper number of BOs.\n");
> +		ret = -EINVAL;

Nice catch. Thanks!

Reviewed-by: Melissa Wen <mwen@...lia.com>

I'll apply to drm-misc-next.

>  		goto fail;
>  	}
>  
> -- 
> 2.39.3
>