linux-kernel - Re: [PATCH][next] rapidio/rio_mport_cdev: Use array_size() helper in copy_{from,to}

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Message-ID: <202006161139.AA7D18E833@keescook>
Date:   Tue, 16 Jun 2020 11:39:39 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Matt Porter <mporter@...nel.crashing.org>,
        Alexandre Bounine <alex.bou9@...il.com>,
        linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: Re: [PATCH][next] rapidio/rio_mport_cdev: Use array_size() helper in
 copy_{from,to}_user()

On Tue, Jun 16, 2020 at 01:30:50PM -0500, Gustavo A. R. Silva wrote:
> Use array_size() helper instead of the open-coded version in
> copy_{from,to}_user(). These sorts of multiplication factors
> need to be wrapped in array_size().
> 
> This issue was found with the help of Coccinelle and, audited
> and fixed manually.
> 
> Addresses-KSPP-ID: https://github.com/KSPP/linux/issues/83
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook