linux-hardening - Re: [PATCH][next] dmaengine: stm32-mdma: Use struct_size() helper in devm

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Message-ID: <202109301100.2BB00DE96A@keescook>
Date:   Thu, 30 Sep 2021 11:00:49 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Vinod Koul <vkoul@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        dmaengine@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] dmaengine: stm32-mdma: Use struct_size() helper in
 devm_kzalloc()

On Wed, Sep 29, 2021 at 05:29:22PM -0500, Gustavo A. R. Silva wrote:
> Make use of the struct_size() helper instead of an open-coded version,
> in order to avoid any potential type mistakes or integer overflows that,
> in the worse scenario, could lead to heap overflows.
> 
> Link: https://github.com/KSPP/linux/issues/160
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Looks right to me.

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

-- 
Kees Cook