linux-hardening - Re: [PATCH][next] usb: host: fotg210: Use struct

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Message-ID: <202201201524.F8A4377@keescook>
Date:   Thu, 20 Jan 2022 15:25:09 -0800
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     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: host: fotg210: Use struct_size() helper in
 kzalloc()

On Thu, Jan 20, 2022 at 04:20:43PM -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/host/fotg210-hcd.c:4017:20: 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>

Good-bye more open-coded calculations. :)

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

-- 
Kees Cook