linux-kernel - Re: [PATCH][next] NTB/msi: Use struct_size() helper in devm

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Date:   Thu, 20 Jan 2022 15:34:02 -0800
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Jon Mason <jdmason@...zu.us>, Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <allenbh@...il.com>, linux-ntb@...glegroups.com,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] NTB/msi: Use struct_size() helper in devm_kzalloc()

On Thu, Jan 20, 2022 at 05:02:47PM -0600, 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 worst scenario, could lead to heap overflows.
> 
> Also, address the following sparse warnings:
> drivers/ntb/msi.c:46:23: warning: using sizeof on a flexible structure
> 
> Link: https://github.com/KSPP/linux/issues/174
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Heh, the variable was even named struct_size. ;)

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

-- 
Kees Cook