linux-hardening - Re: [PATCH][next] wireless: wext-spy: Fix out-of-bounds warning

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Message-ID: <317099c78edb9fdde3db3f1e7c9a4f77529b281a.camel@sipsolutions.net>
Date:   Thu, 22 Apr 2021 09:04:19 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH][next] wireless: wext-spy: Fix out-of-bounds warning

On Wed, 2021-04-21 at 18:43 -0500, Gustavo A. R. Silva wrote:
> 
>  	/* Just do it */
> -	memcpy(&(spydata->spy_thr_low), &(threshold->low),
> -	       2 * sizeof(struct iw_quality));
> +	memcpy(&spydata->spy_thr_low, &threshold->low, sizeof(threshold->low));
> +	memcpy(&spydata->spy_thr_high, &threshold->high, sizeof(threshold->high));
> 

It would've been really simple to stick to 80 columns here (and
everywhere in the patch), please do that.

Also, why not just use struct assigments?

	spydata->spy_thr_low = threshold->low;

etc.

Seems far simpler (and shorter lines).

johannes