linux-kernel - [PATCH 4.14 078/178] iommu/amd: Limit the IOVA page range to the specified addresses

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Date:   Mon, 18 Dec 2017 16:48:34 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Gary R Hook <gary.hook@....com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.14 078/178] iommu/amd: Limit the IOVA page range to the specified addresses

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gary R Hook <gary.hook@....com>


[ Upstream commit b92b4fb5c14257c0e7eae291ecc1f7b1962e1699 ]

The extent of pages specified when applying a reserved region should
include up to the last page of the range, but not the page following
the range.

Signed-off-by: Gary R Hook <gary.hook@....com>
Fixes: 8d54d6c8b8f3 ('iommu/amd: Implement apply_dm_region call-back')
Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/iommu/amd_iommu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3155,7 +3155,7 @@ static void amd_iommu_apply_resv_region(
 	unsigned long start, end;
 
 	start = IOVA_PFN(region->start);
-	end   = IOVA_PFN(region->start + region->length);
+	end   = IOVA_PFN(region->start + region->length - 1);
 
 	WARN_ON_ONCE(reserve_iova(&dma_dom->iovad, start, end) == NULL);
 }