Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:6 as permitted sender) client-ip=2620:137:e000::3:6;
Date:   Fri, 29 Sep 2023 10:26:35 -0700
From:   Kees Cook <keescook@chromium.org>
To:     "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc:     Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
        Jussi Kivilinna <jussi.kivilinna@iki.fi>,
        alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org,
        linux-hardening@vger.kernel.org
Subject: Re: [PATCH][next] ALSA: 6fire: Fix undefined behavior bug in struct
 comm_runtime
Message-ID: <202309291024.14F6DA0@keescook>
References: <ZRb0WiViajjqcyKT@work>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <ZRb0WiViajjqcyKT@work>
Precedence: bulk

On Fri, Sep 29, 2023 at 05:59:22PM +0200, Gustavo A. R. Silva wrote:
> `struct urb` is a flexible structure, which means that it contains a
> flexible-array member at the bottom. This could potentially lead to an
> overwrite of the objects following `receiver` in `struct comm_runtime`,
> among them some function pointers.
> 
> Fix this by placing the declaration of object `receiver` at the end of
> `struct comm_runtime`.
> 
> Fixes: ddb6b5a96437 ("ALSA: 6fire: fix DMA issues with URB transfer_buffer usage")
> Cc: stable@vger.kernel.org
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Should these mention -Wflex-array-member-not-at-end ?

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

-- 
Kees Cook