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Date: Sun, 1 Oct 2023 08:51:32 +0200
From: "Gustavo A. R. Silva" <>
To: Kees Cook <>,
 "Gustavo A. R. Silva" <>
Cc: Jaroslav Kysela <>, Takashi Iwai <>,
 Jussi Kivilinna <>,,,
Subject: Re: [PATCH][next] ALSA: 6fire: Fix undefined behavior bug in struct

On 9/29/23 19:26, Kees Cook wrote:
> 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:
>> Signed-off-by: Gustavo A. R. Silva <>
> Should these mention -Wflex-array-member-not-at-end ?

Probably, yes. I wasn't sure about mentioning it because it's not been released yet.

> Reviewed-by: Kees Cook <>


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