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SubjectRe: [PATCH] iommu: amd: call free_iova_fast with pfn in map_sg
On Thu Jan 17 19, Jerry Snitselaar wrote:
>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@8bytes.org>
>Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
>Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.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
>


I forgot to add the Fixes line.

Fixes: 80187fd39dcb ("iommu/amd: Optimize map_sg and unmap_sg")

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