From: Peter Xu <peterx@redhat.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: iommu@lists.linux-foundation.org, tursulin@ursulin.net,
dwmw2@infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] iommu/vt-d: Fix shift overflow in qi_flush_dev_iotlb
Date: Wed, 13 Dec 2017 15:13:55 +0800 [thread overview]
Message-ID: <20171213071355.GD7780@xz-mi> (raw)
In-Reply-To: <20171212224250.22173.74201.stgit@gimli.home>
On Tue, Dec 12, 2017 at 03:43:08PM -0700, Alex Williamson wrote:
[...]
> diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
> index 9a7ffd13c7f0..87888b102057 100644
> --- a/drivers/iommu/dmar.c
> +++ b/drivers/iommu/dmar.c
> @@ -1345,7 +1345,9 @@ void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 qdep,
> struct qi_desc desc;
>
> if (mask) {
> - BUG_ON(addr & ((1 << (VTD_PAGE_SHIFT + mask)) - 1));
> + BUG_ON((mask > MAX_AGAW_PFN_WIDTH) ||
> + ((mask == MAX_AGAW_PFN_WIDTH) && addr) ||
> + (addr & ((1 << (VTD_PAGE_SHIFT + mask)) - 1)));
Could it work if we just use 1ULL instead of 1 here? Thanks,
--
Peter Xu
next prev parent reply other threads:[~2017-12-13 7:14 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-12 22:43 [PATCH] iommu/vt-d: Fix shift overflow in qi_flush_dev_iotlb Alex Williamson
2017-12-13 7:13 ` Peter Xu [this message]
2017-12-13 15:58 ` Alex Williamson
2017-12-13 16:41 ` Hook, Gary
2017-12-13 17:15 ` Alex Williamson
2017-12-13 17:31 ` Hook, Gary
2017-12-15 7:29 ` Peter Xu
2017-12-15 3:12 ` kbuild test robot
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