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Message-Id: <1492943001-1078-1-git-send-email-bianpan201602@163.com>
Date: Sun, 23 Apr 2017 18:23:21 +0800
From: Pan Bian <bianpan201602@....com>
To: Joerg Roedel <joro@...tes.org>, iommu@...ts.linux-foundation.org
Cc: linux-kernel@...r.kernel.org, Pan Bian <bianpan2016@....com>
Subject: [PATCH 1/1] iommu/amd: fix incorrect error handling
From: Pan Bian <bianpan2016@....com>
In function amd_iommu_bind_pasid(), the control flow jumps to label
out_free when pasid_state->mm and mm is NULL. And mmput(mm) is called.
In function mmput(mm), mm is referenced without validation. This will
result in a NULL dereference bug. This patch fixes the bug.
Signed-off-by: Pan Bian <bianpan2016@....com>
---
drivers/iommu/amd_iommu_v2.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c
index 0633439..6629c47 100644
--- a/drivers/iommu/amd_iommu_v2.c
+++ b/drivers/iommu/amd_iommu_v2.c
@@ -696,9 +696,9 @@ int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
out_unregister:
mmu_notifier_unregister(&pasid_state->mn, mm);
+ mmput(mm);
out_free:
- mmput(mm);
free_pasid_state(pasid_state);
out:
--
1.9.1
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