linux-kernel - Re: [PATCH][next] drm/gud: Use size_add() in call to struct

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Message-Id: <169601489950.3012131.9568928913525935036.b4-ty@chromium.org>
Date:   Fri, 29 Sep 2023 12:15:00 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Noralf Trønnes <noralf@...nnes.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Peter Stuge <peter@...ge.se>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] drm/gud: Use size_add() in call to struct_size()

On Fri, 15 Sep 2023 12:43:20 -0600, Gustavo A. R. Silva wrote:
> If, for any reason, the open-coded arithmetic causes a wraparound, the
> protection that `struct_size()` adds against potential integer overflows
> is defeated. Fix this by hardening call to `struct_size()` with `size_add()`.
> 
> 

Applied to for-next/hardening, thanks!

[1/1] drm/gud: Use size_add() in call to struct_size()
      https://git.kernel.org/kees/c/836ccb46073e

Take care,

-- 
Kees Cook