linux-kernel - Re: [bug] NULL pointer deref after 3f6634d997db ("iommu: Use right way to retrieve iommu

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Message-ID: <YnJpQiEJWNjyOyji@8bytes.org>
Date:   Wed, 4 May 2022 13:53:38 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Jan Stancek <jstancek@...hat.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Ben Skeggs <bskeggs@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@....de>, bgoncalv@...hat.com
Subject: Re: [bug] NULL pointer deref after 3f6634d997db ("iommu: Use right
 way to retrieve iommu_ops")

Hi Robin,

On Wed, May 04, 2022 at 12:14:07PM +0100, Robin Murphy wrote:
> Oof, this can probably be hit with vfio-noiommu too, and by the look of
> things, `echo auto > /sys/kernel/iommu_groups/0/type` would likely blow
> up as well. Does the patch below work for you?

Thanks for the quick patch! I am delaying to send iommu-fixes upstream
for now in the hope the fix can make it into the branch asap. Please
send it out as a separate patch as soon as it is successfully tested.

Regards,

	Joerg