linux-hardening - Re: [PATCH] ALSA: lola: Bounds check loop iterator against streams array size

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Date:   Sat, 21 May 2022 08:49:20 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Kees Cook <keescook@...omium.org>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] ALSA: lola: Bounds check loop iterator against streams array size

On Fri, 20 May 2022 18:55:37 +0200,
Kees Cook wrote:
> 
> GCC 12 sees that it's technically possible for num_streams to be larger
> than ARRAY_SIZE(pcm->streams). Bounds-check the iterator.
> 
> ../sound/pci/lola/lola_pcm.c: In function 'lola_pcm_update':
> ../sound/pci/lola/lola_pcm.c:567:64: warning: array subscript [0, 31] is outside array bounds of 'struct lola_stream[16]' [-Warray-bounds]
>   567 |                         struct lola_stream *str = &pcm->streams[i];
>       |                                                    ~~~~~~~~~~~~^~~
> In file included from ../sound/pci/lola/lola_pcm.c:15:
> ../sound/pci/lola/lola.h:307:28: note: while referencing 'streams'
>   307 |         struct lola_stream streams[MAX_STREAM_COUNT];
>       |                            ^~~~~~~
> 
> Cc: Jaroslav Kysela <perex@...ex.cz>
> Cc: Takashi Iwai <tiwai@...e.com>
> Cc: alsa-devel@...a-project.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Thanks, applied now.


Takashi