linux-kernel - Re: [PATCH] iommu: check if group is NULL before remove device

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Message-ID: <YO/hpPpu6Z526+Ia@8bytes.org>
Date:   Thu, 15 Jul 2021 09:20:04 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Frank Wunderlich <linux@...web.de>
Cc:     iommu@...ts.linux-foundation.org,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        yong.wu@...iatek.com
Subject: Re: [PATCH] iommu: check if group is NULL before remove device

On Thu, Jul 15, 2021 at 09:11:50AM +0200, Frank Wunderlich wrote:
> From: Frank Wunderlich <frank-w@...lic-files.de>
> 
> if probe is failing, iommu_group may be not initialized,

Sentences start with capital letters.

IOMMU patch subjects too, after the 'iommu:' prefix.

> so freeing it will result in NULL pointer access

Please describe in more detail how this NULL-ptr dereference is
triggered.

Regards,

	Joerg