linux-kernel - Re: [PATCH] drm/msm/adreno: Remove VLA usage

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Date:   Mon, 2 Jul 2018 10:34:08 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     Kees Cook <keescook@...omium.org>, Rob Clark <robdclark@...il.com>,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>, David Airlie <airlied@...ux.ie>,
        Jordan Crouse <jcrouse@...eaurora.org>
Subject: Re: [PATCH] drm/msm/adreno: Remove VLA usage

> @@ -91,12 +93,13 @@  static int zap_shader_load_mdt(struct msm_gpu *gpu, const char *fwname)
>  		ret = qcom_mdt_load(dev, fw, fwname, GPU_PAS_ID,
>  				mem_region, mem_phys, mem_size, NULL);
>  	} else {
> -		char newname[strlen("qcom/") + strlen(fwname) + 1];
> +		char *newname;
> 
> -		sprintf(newname, "qcom/%s", fwname);
> +		newname = kasprintf(GFP_KERNEL, "qcom/%s", fwname);
> 
>  		ret = qcom_mdt_load(dev, fw, newname, GPU_PAS_ID,
>  				mem_region, mem_phys, mem_size, NULL);

I have taken another look also at this update suggestion.
Now I wonder why the return value is not checked for the added name construction
in the way as it is specified for the function “adreno_request_fw”.
Will another condition check make sense at this place?

Regards,
Markus