linux-kernel - Re: [PATCH][next] USB: serial: ti_usb_3410_5052: Use struct_size() helper in ti_write

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Message-ID: <202201201523.9751D119@keescook>
Date:   Thu, 20 Jan 2022 15:23:36 -0800
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] USB: serial: ti_usb_3410_5052: Use struct_size()
 helper in ti_write_byte()

On Thu, Jan 20, 2022 at 03:31:31PM -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/usb/serial/ti_usb_3410_5052.c:1521:16: 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>

Looks good.

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

-- 
Kees Cook