linux-kernel - [PATCH] iommu: amd: Added value check

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Message-Id: <20221118094402.122027-1-arefev@swemel.ru>
Date:   Fri, 18 Nov 2022 12:44:02 +0300
From:   Denis Arefev <arefev@...mel.ru>
To:     Joerg Roedel <joro@...tes.org>
Cc:     Will Deacon <will@...nel.org>, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org,
        trufanov@...mel.ru, vfh@...mel.ru
Subject: [PATCH] iommu: amd: Added value check

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@...mel.ru>
---
 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