[PATCH 4.19 008/149] iommu/amd: Call free_iova_fast with pfn in map_sg

From: Greg Kroah-Hartman
Date: Tue Mar 12 2019 - 13:57:15 EST

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


[ Upstream commit 51d8838d66d3249508940d8f59b07701f2129723 ]

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@xxxxxxxxxx>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
Signed-off-by: Jerry Snitselaar <jsnitsel@xxxxxxxxxx>
Fixes: 80187fd39dcb ("iommu/amd: Optimize map_sg and unmap_sg")
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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 34c9aa76a7bd..2a5c05ca7fca 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2561,7 +2561,7 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,

- free_iova_fast(&dma_dom->iovad, address, npages);
+ free_iova_fast(&dma_dom->iovad, address >> PAGE_SHIFT, npages);

return 0;