linux-kernel - Re: [PATCH] crypto: caam - Avoid GCC memset bug warning

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Date:   Wed, 28 Dec 2022 10:39:17 +0100
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Anders Roxell <anders.roxell@...aro.org>,
        Kees Cook <keescook@...omium.org>,
        Horia Geantă <horia.geanta@....com>,
        Gaurav Jain <gaurav.jain@....com>,
        Pankaj Gupta <pankaj.gupta@....com>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
        linux-crypto@...r.kernel.org, kernel@...gutronix.de,
        "David S. Miller" <davem@...emloft.net>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] crypto: caam - Avoid GCC memset bug warning

On Wed, Dec 28, 2022 at 04:46:39PM +0800, Herbert Xu wrote:
> Certain versions of gcc don't like the memcpy with a NULL dst
> (which only happens with a zero length).  This only happens
> when debugging is enabled so add an if clause to work around
> these warnings.
> 
> A similar warning used to be generated by sparse but that was
> fixed years ago.
> 
> Link: https://lore.kernel.org/lkml/202210290446.qBayTfzl-lkp@intel.com
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Kees Cook <keescook@...omium.org>
> Reported-by: Uwe Kleine-K�nig <u.kleine-koenig@...gutronix.de>

Huh, broken encoding in the mail. I'd appreciate someone to doublecheck
it's fine in the final commit.

Tested-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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