From: Jason Gunthorpe <jgg@ziepe.ca>
To: Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com>
Cc: iommu@lists.linux.dev, Joerg Roedel <joro@8bytes.org>,
Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
David Woodhouse <dwmw2@infradead.org>,
Lu Baolu <baolu.lu@linux.intel.com>
Subject: Re: UBSAN: shift-out-of-bounds in drivers/iommu/intel/iommu.h:1101:17
Date: Fri, 27 Feb 2026 20:34:05 -0400 [thread overview]
Message-ID: <20260228003405.GP44359@ziepe.ca> (raw)
In-Reply-To: <11145826.aFP6jjVeTY@jkrzyszt-mobl2.ger.corp.intel.com>
On Tue, Feb 24, 2026 at 12:16:32AM +0100, Janusz Krzysztofik wrote:
> Hello,
>
> Please have a look at
> https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/15478
>
> For me it looks like an IOMMU issue. I've added there a comment that
> summarizes my findings.
If I recall there are some error flows that will push a 0 length
gather to the driver, it is supposed to ignore a gather where
start == end
Do you think that is the issue?
Jason
next prev parent reply other threads:[~2026-02-28 0:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-23 23:16 UBSAN: shift-out-of-bounds in drivers/iommu/intel/iommu.h:1101:17 Janusz Krzysztofik
2026-02-28 0:34 ` Jason Gunthorpe [this message]
2026-03-09 10:57 ` Janusz Krzysztofik
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