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From: "Kun(llfl)" <llfl@linux.alibaba.com>
To: Joerg Roedel <joro@8bytes.org>,
	Vasant Hegde <vasant.hegde@amd.com>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>,
	Will Deacon <will@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	iommu@lists.linux.dev,
	linux-kernel@vger.kernel.org
Subject: [PATCH 1/1] iommu/amd: Fix memory leak in alloc_pci_segment()
Date: Thu, 25 Apr 2024 16:48:31 +0800
Message-ID: <92ff13341044a39953f0ba116cf7f9881488f8c8.1714034489.git.llfl@linux.alibaba.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

Fix the memory leak issue that occurs when resource allocation fails in
alloc_pci_segment(). The dev_table, alias_table, and rlookup_table were
introduced individually in commits 04230c119930, 99fc4ac3d297,
and eda797a27795, but they all fail to release allocated resources
when other allocations fail.

Fixes: 04230c119930 ("iommu/amd: Introduce per PCI segment device table")
Reported-by: Xuchun Shang <xuchun.shang@linux.alibaba.com>
Signed-off-by: Kun(llfl) <llfl@linux.alibaba.com>
---
 drivers/iommu/amd/init.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index ac6754a85f35..4ce567f39473 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -1642,13 +1642,22 @@ static struct amd_iommu_pci_seg *__init alloc_pci_segment(u16 id,
 	list_add_tail(&pci_seg->list, &amd_iommu_pci_seg_list);
 
 	if (alloc_dev_table(pci_seg))
-		return NULL;
+		goto alloc_dev_fail;
 	if (alloc_alias_table(pci_seg))
-		return NULL;
+		goto alloc_alias_fail;
 	if (alloc_rlookup_table(pci_seg))
-		return NULL;
+		goto alloc_rlookup_fail;
 
 	return pci_seg;
+
+alloc_rlookup_fail:
+	free_rlookup_table(pci_seg);
+alloc_alias_fail:
+	free_alias_table(pci_seg);
+alloc_dev_fail:
+	free_dev_table(pci_seg);
+	kfree(pci_seg);
+	return NULL;
 }
 
 static struct amd_iommu_pci_seg *__init get_pci_segment(u16 id,
-- 
2.43.0