linux-kernel - [PATCH v7 4/6] iommu/s390: Fix incorrect aperture check

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Message-Id: <20221017124558.1386337-5-schnelle@linux.ibm.com>
Date:   Mon, 17 Oct 2022 14:45:56 +0200
From:   Niklas Schnelle <schnelle@...ux.ibm.com>
To:     iommu@...ts.linux.dev, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jason Gunthorpe <jgg@...dia.com>
Cc:     Matthew Rosato <mjrosato@...ux.ibm.com>,
        Gerd Bayer <gbayer@...ux.ibm.com>,
        Pierre Morel <pmorel@...ux.ibm.com>,
        linux-s390@...r.kernel.org, borntraeger@...ux.ibm.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com,
        gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
        svens@...ux.ibm.com, linux-kernel@...r.kernel.org
Subject: [PATCH v7 4/6] iommu/s390: Fix incorrect aperture check

The domain->geometry.aperture_end specifies the last valid address treat
it as such when checking if a DMA address is valid.

Reviewed-by: Pierre Morel <pmorel@...ux.ibm.com>
Reviewed-by: Matthew Rosato <mjrosato@...ux.ibm.com>
Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
---
v3->v4:
- Make check robust against overflow (Jason)

 drivers/iommu/s390-iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
index c4203a37faa4..fa8cb97bfc88 100644
--- a/drivers/iommu/s390-iommu.c
+++ b/drivers/iommu/s390-iommu.c
@@ -213,7 +213,7 @@ static int s390_iommu_update_trans(struct s390_domain *s390_domain,
 	int rc = 0;
 
 	if (dma_addr < s390_domain->domain.geometry.aperture_start ||
-	    dma_addr + size > s390_domain->domain.geometry.aperture_end)
+	    (dma_addr + size - 1) > s390_domain->domain.geometry.aperture_end)
 		return -EINVAL;
 
 	nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
-- 
2.34.1