linux-kernel - Re: [PATCH] ALSA: pcm: Test for "silence" field in struct "pcm_format

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Date:   Mon, 11 Apr 2022 09:30:53 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Mark Brown <broonie@...nel.org>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org,
        syzbot+205eb15961852c2c5974@...kaller.appspotmail.com
Subject: Re: [PATCH] ALSA: pcm: Test for "silence" field in struct "pcm_format_data"

On Sat, 09 Apr 2022 03:26:55 +0200,
Fabio M. De Francesco wrote:
> 
> Syzbot reports "KASAN: null-ptr-deref Write in
> snd_pcm_format_set_silence".[1]
> 
> It is due to missing validation of the "silence" field of struct
> "pcm_format_data" in "pcm_formats" array.
> 
> Add a test for valid "pat" and, if it is not so, return -EINVAL.
> 
> [1] https://lore.kernel.org/lkml/000000000000d188ef05dc2c7279@google.com/
> 
> Reported-and-tested-by: syzbot+205eb15961852c2c5974@...kaller.appspotmail.com
> Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>

Thanks, applied now.


> ---
> 
> I wasn't able to figure out the commit for the "Fixes:" tag. If this patch
> is good, can someone please help with providing this missing information?

That must be present from the very beginning.
I just add Cc-to-stable for allowing backport to all releases.


thanks,

Takashi