[PATCH 4.19 180/264] vfio iommu type1: Fix memory leak in vfio_iommu_type1_pin_pages

[Greg Kroah-Hartman]

From: Xiaoyang Xu <xuxiaoya...@huawei.com>

[ Upstream commit 2e6cfd496f5b57034cf2aec738799571b5a52124 ]

pfn is not added to pfn_list when vfio_add_to_pfn_list fails.
vfio_unpin_page_external will exit directly without calling
vfio_iova_put_vfio_pfn.  This will lead to a memory leak.

Fixes: a54eb55045ae ("vfio iommu type1: Add support for mediated devices")
Signed-off-by: Xiaoyang Xu <xuxiaoya...@huawei.com>
[aw: simplified logic, add Fixes]
Signed-off-by: Alex Williamson <alex.william...@redhat.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/vfio/vfio_iommu_type1.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 05d8553635ee7..95ce167a8ad92 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -636,7 +636,8 @@ static int vfio_iommu_type1_pin_pages(void *iommu_data,
 
                ret = vfio_add_to_pfn_list(dma, iova, phys_pfn[i]);
                if (ret) {
-                       vfio_unpin_page_external(dma, iova, do_accounting);
+                       if (put_pfn(phys_pfn[i], dma->prot) && do_accounting)
+                               vfio_lock_acct(dma, -1, true);
                        goto pin_unwind;
                }
        }
-- 
2.25.1