linux-kernel - [PATCH] iommu: amd: call free_iova_fast with pfn in map

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Message-Id: <20190117192902.15158-1-jsnitsel@redhat.com>
Date:   Thu, 17 Jan 2019 12:29:02 -0700
From:   Jerry Snitselaar <jsnitsel@...hat.com>
To:     iommu@...ts.linux-foundation.org
Cc:     linux-kernel@...r.kernel.org, Joerg Roedel <joro@...tes.org>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: [PATCH] iommu: amd: call free_iova_fast with pfn in map_sg

In the error path of map_sg, free_iova_fast is being called with
address instead of the pfn. This results in a bad value getting into
the rcache, and can result in hitting a BUG_ON when
iova_magazine_free_pfns is called.

Cc: Joerg Roedel <joro@...tes.org>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Signed-off-by: Jerry Snitselaar <jsnitsel@...hat.com>
---
 drivers/iommu/amd_iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 87ba23a75b38..418df8ff3e50 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2623,7 +2623,7 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
 	}
 
 out_free_iova:
-	free_iova_fast(&dma_dom->iovad, address, npages);
+	free_iova_fast(&dma_dom->iovad, address >> PAGE_SHIFT, npages);
 
 out_err:
 	return 0;
-- 
2.20.1.98.gecbdaf0899