linux-kernel - [PATCH 5.4 44/57] vfio: avoid possible overflow in vfio_iommu_type1_pin

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Date:   Mon,  4 May 2020 19:57:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yan Zhao <yan.y.zhao@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>
Subject: [PATCH 5.4 44/57] vfio: avoid possible overflow in vfio_iommu_type1_pin_pages

From: Yan Zhao <yan.y.zhao@...el.com>

commit 0ea971f8dcd6dee78a9a30ea70227cf305f11ff7 upstream.

add parentheses to avoid possible vaddr overflow.

Fixes: a54eb55045ae ("vfio iommu type1: Add support for mediated devices")
Signed-off-by: Yan Zhao <yan.y.zhao@...el.com>
Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/vfio/vfio_iommu_type1.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -593,7 +593,7 @@ static int vfio_iommu_type1_pin_pages(vo
 			continue;
 		}
 
-		remote_vaddr = dma->vaddr + iova - dma->iova;
+		remote_vaddr = dma->vaddr + (iova - dma->iova);
 		ret = vfio_pin_page_external(dma, remote_vaddr, &phys_pfn[i],
 					     do_accounting);
 		if (ret)