linux-kernel - Re: [PATCH] i2c: mux: harden i2c_mux

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Message-ID: <YytwVuLBo4pPHKEO@shikoro>
Date:   Wed, 21 Sep 2022 22:13:10 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Peter Rosin <peda@...ntia.se>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] i2c: mux: harden i2c_mux_alloc() against integer
 overflows

On Thu, Sep 15, 2022 at 02:30:58PM +0300, Dan Carpenter wrote:
> A couple years back we went through the kernel an automatically
> converted size calculations to use struct_size() instead.  The
> struct_size() calculation is protected against integer overflows.
> 
> However it does not make sense to use the result from struct_size()
> for additional math operations as that would negate any safeness.
> 
> Fixes: 1f3b69b6b939 ("i2c: mux: Use struct_size() in devm_kzalloc()")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

Applied to for-current, thanks!


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