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Date: Sun, 1 Oct 2023 08:53:30 +0200
From: "Gustavo A. R. Silva" <>
To: Kees Cook <>,
 "Gustavo A. R. Silva" <>
Cc: Jaroslav Kysela <>, Takashi Iwai <>,
 Torsten Schenk <>,,,
Subject: Re: [PATCH][next] ALSA: 6fire: Fix undefined behavior bug in struct

On 9/29/23 19:27, Kees Cook wrote:
> On Fri, Sep 29, 2023 at 06:06:32PM +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 `out_urb` in `struct midi_runtime`,
>> among them a function pointer.
>> Fix this by placing the declaration of object `out_urb` at the end of
>> `struct midi_runtime`.
>> Fixes: c6d43ba816d1 ("ALSA: usb/6fire - Driver for TerraTec DMX 6Fire USB")
>> Cc:
>> Signed-off-by: Gustavo A. R. Silva <>
> Another good find. :)

There are more coming. :)

> Reviewed-by: Kees Cook <>


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