linux-kernel - [PATCH 3.10 16/44] iommu/vt-d: Fix an off-by-one bug in __domain

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Date:	Tue, 13 Jan 2015 23:23:37 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Jiang Liu <jiang.liu@...ux.intel.com>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 3.10 16/44] iommu/vt-d: Fix an off-by-one bug in __domain_mapping()

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

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

From: Jiang Liu <jiang.liu@...ux.intel.com>

commit cc4f14aa170d895c9a43bdb56f62070c8a6da908 upstream.

There's an off-by-one bug in function __domain_mapping(), which may
trigger the BUG_ON(nr_pages < lvl_pages) when
	(nr_pages + 1) & superpage_mask == 0

The issue was introduced by commit 9051aa0268dc "intel-iommu: Combine
domain_pfn_mapping() and domain_sg_mapping()", which sets sg_res to
"nr_pages + 1" to avoid some of the 'sg_res==0' code paths.

It's safe to remove extra "+1" because sg_res is only used to calculate
page size now.

Reported-And-Tested-by: Sudeep Dutt <sudeep.dutt@...el.com>
Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
Acked-By: David Woodhouse <David.Woodhouse@...el.com>
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iommu/intel-iommu.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1796,7 +1796,7 @@ static int __domain_mapping(struct dmar_
 	struct dma_pte *first_pte = NULL, *pte = NULL;
 	phys_addr_t uninitialized_var(pteval);
 	int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT;
-	unsigned long sg_res;
+	unsigned long sg_res = 0;
 	unsigned int largepage_lvl = 0;
 	unsigned long lvl_pages = 0;
 
@@ -1807,10 +1807,8 @@ static int __domain_mapping(struct dmar_
 
 	prot &= DMA_PTE_READ | DMA_PTE_WRITE | DMA_PTE_SNP;
 
-	if (sg)
-		sg_res = 0;
-	else {
-		sg_res = nr_pages + 1;
+	if (!sg) {
+		sg_res = nr_pages;
 		pteval = ((phys_addr_t)phys_pfn << VTD_PAGE_SHIFT) | prot;
 	}
 


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