linux-kernel - [PATCH] iommu/sva: Fix memory leak in iommu_sva_bind

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Message-ID: <20231213111450.2487861-1-harshit.m.mogalapalli@oracle.com>
Date:   Wed, 13 Dec 2023 03:14:50 -0800
From:   Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Cc:     dan.carpenter@...aro.org, kernel-janitors@...r.kernel.org,
        error27@...il.com, harshit.m.mogalapalli@...cle.com
Subject: [PATCH] iommu/sva: Fix memory leak in iommu_sva_bind_device()

Free the handle when the domain allocation fails before unlocking and
returning.

Fixes: 092edaddb660 ("iommu: Support mm PASID 1:n with sva domains")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
---
This is based on static analysis with smatch, only compile tested.
---
 drivers/iommu/iommu-sva.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/iommu-sva.c b/drivers/iommu/iommu-sva.c
index 5175e8d85247..c3fc9201d0be 100644
--- a/drivers/iommu/iommu-sva.c
+++ b/drivers/iommu/iommu-sva.c
@@ -101,7 +101,7 @@ struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct mm_struct *mm
 	domain = iommu_sva_domain_alloc(dev, mm);
 	if (!domain) {
 		ret = -ENOMEM;
-		goto out_unlock;
+		goto out_free_handle;
 	}
 
 	ret = iommu_attach_device_pasid(domain, dev, iommu_mm->pasid);
@@ -118,6 +118,7 @@ struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct mm_struct *mm
 
 out_free_domain:
 	iommu_domain_free(domain);
+out_free_handle:
 	kfree(handle);
 out_unlock:
 	mutex_unlock(&iommu_sva_lock);
-- 
2.39.3