linux-kernel - RE: [PATCH] ASoC: max98390: Fix potential crash during param fw loading

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Date:   Wed, 3 Jun 2020 11:37:44 +0000
From:   Steve Lee <SteveS.Lee@...imintegrated.com>
To:     Mark Brown <broonie@...nel.org>
CC:     "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "ckeepax@...nsource.cirrus.com" <ckeepax@...nsource.cirrus.com>,
        "geert@...ux-m68k.org" <geert@...ux-m68k.org>,
        "rf@...nsource.wolfsonmicro.com" <rf@...nsource.wolfsonmicro.com>,
        "shumingf@...ltek.com" <shumingf@...ltek.com>,
        "srinivas.kandagatla@...aro.org" <srinivas.kandagatla@...aro.org>,
        "krzk@...nel.org" <krzk@...nel.org>,
        "dmurphy@...com" <dmurphy@...com>,
        "jack.yu@...ltek.com" <jack.yu@...ltek.com>,
        "nuno.sa@...log.com" <nuno.sa@...log.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "ryan.lee.maxim@...il.com" <ryan.lee.maxim@...il.com>,
        Ryan Lee <RyanS.Lee@...imintegrated.com>,
        "steves.lee.maxim@...il.com" <steves.lee.maxim@...il.com>
Subject: RE: [PATCH] ASoC: max98390: Fix potential crash during param fw
 loading



> -----Original Message-----
> From: Mark Brown <broonie@...nel.org>
> Sent: Wednesday, June 3, 2020 8:32 PM
> To: Steve Lee <SteveS.Lee@...imintegrated.com>
> Cc: lgirdwood@...il.com; perex@...ex.cz; tiwai@...e.com;
> ckeepax@...nsource.cirrus.com; geert@...ux-m68k.org;
> rf@...nsource.wolfsonmicro.com; shumingf@...ltek.com;
> srinivas.kandagatla@...aro.org; krzk@...nel.org; dmurphy@...com;
> jack.yu@...ltek.com; nuno.sa@...log.com; linux-kernel@...r.kernel.org;
> alsa-devel@...a-project.org; ryan.lee.maxim@...il.com; Ryan Lee
> <RyanS.Lee@...imintegrated.com>; steves.lee.maxim@...il.com
> Subject: Re: [PATCH] ASoC: max98390: Fix potential crash during param fw
> loading
> 
> On Wed, Jun 03, 2020 at 08:18:19PM +0900, Steve Lee wrote:
> 
> > +	param_start_addr = (dsm_param[0] & 0xff) | (dsm_param[1] & 0xff) <<
> 8;
> > +	param_size = (dsm_param[2] & 0xff) | (dsm_param[3] & 0xff) << 8;
> > +	if (param_size > MAX98390_DSM_PARAM_MAX_SIZE ||
> > +		param_start_addr < DSM_STBASS_HPF_B0_BYTE0) {
> > +		dev_err(component->dev,
> > +			"param fw is invalid.\n");
> > +		goto err_alloc;
> > +	}
> 
> This is now reading the size out of the header of the file which is good but it
> should also validate that the file is big enough to have this much data in it,
> otherwise it's possible to read beyond the end of the firmware file (eg, if it got
> truncated somehow).  Previously the code used the size of the file read from disk
> so that wasn't an issue.

 Thanks for quick comment. Can this case cover by below line?
+	if (fw->size < MAX98390_DSM_PARAM_MIN_SIZE) {
+		dev_err(component->dev,
+			"param fw is invalid.\n");
+		goto err_alloc;
+	}