[PATCH] iommu: amd: Added value check

[Denis Arefev]

Аdded a return value check for the function
mmu_notifier_register.

Return value of a function 'mmu_notifier_register'
called at iommu_v2.c:642 is not checked,
 but it is usually checked for this function

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Denis Arefev <arefev@xxxxxxxxx>
---
 drivers/iommu/amd/iommu_v2.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/amd/iommu_v2.c b/drivers/iommu/amd/iommu_v2.c
index 5ecc0bc608ec..88134f34589f 100644
--- a/drivers/iommu/amd/iommu_v2.c
+++ b/drivers/iommu/amd/iommu_v2.c
@@ -639,7 +639,9 @@ int amd_iommu_bind_pasid(struct pci_dev *pdev, u32 pasid,
 	if (pasid_state->mm == NULL)
 		goto out_free;
 
-	mmu_notifier_register(&pasid_state->mn, mm);
+	ret = mmu_notifier_register(&pasid_state->mn, mm);
+	if (ret)
+		goto out_free;
 
 	ret = set_pasid_state(dev_state, pasid_state, pasid);
 	if (ret)
-- 
2.25.1