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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
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