linux-kernel - Re: [PATCH] ASoC:codecs: lpass: Fix for KASAN use_after

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Date:   Tue, 9 May 2023 23:12:46 +0900
From:   Mark Brown <broonie@...nel.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Ravulapati Vishnu Vardhan Rao <quic_visr@...cinc.com>,
        Banajit Goswami <bgoswami@...cinc.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        "moderated list:QCOM AUDIO (ASoC) DRIVERS" 
        <alsa-devel@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC:codecs: lpass: Fix for KASAN use_after_free out of
 bounds

On Tue, May 09, 2023 at 01:26:32PM +0100, Srinivas Kandagatla wrote:
> On 09/05/2023 11:32, Ravulapati Vishnu Vardhan Rao wrote:

> >   	val = ucontrol->value.enumerated.item[0];
> > +	if (val < 0 && val > 15)
> > +		return -EINVAL;

> how about

> if (val >= e->items)
> 	return -EINVAL;

The enum value is passed as an int so is signed unfortunately.

> We could get these checks if CONFIG_SND_CTL_INTPUT_VALIDATION  was enabled.

You can't rely on that being set.

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