linux-kernel - Re: [PATCH] staging: greybus: fix stack size warning with UBSAN

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Date:   Mon, 4 Jan 2021 09:22:04 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Vaibhav Agarwal <vaibhav.sr@...il.com>,
        Mark Greer <mgreer@...malcreek.com>,
        Johan Hovold <johan@...nel.org>, Alex Elder <elder@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Arnd Bergmann <arnd@...db.de>, Coiby Xu <coiby.xu@...il.com>,
        greybus-dev@...ts.linaro.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] staging: greybus: fix stack size warning with UBSAN

On Sun, Jan 03, 2021 at 11:35:32PM +0100, Arnd Bergmann wrote:
> @@ -1050,78 +1088,28 @@ static int gbaudio_tplg_create_widget(struct gbaudio_module_info *module,
>  	strlcpy(temp_name, w->name, NAME_SIZE);
>  	snprintf(w->name, NAME_SIZE, "GB %d %s", module->dev_id, temp_name);
>  
> +	if (w->type > ARRAY_SIZE(gbaudio_widgets)) {
                    ^^

Off by one.  >= here.


> +		ret = -EINVAL;
> +		goto error;
> +	}
> +	*dw = gbaudio_widgets[w->type];
> +	dw->name = w->name;

regards,
dan carpenter