linux-kernel - [PATCH v2 1/1] iommu/amd: Fix sysfs leak in iommu init

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Date: Thu,  9 May 2024 08:42:20 +0800
From: "Kun(llfl)" <llfl@...ux.alibaba.com>
To: Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	Jerry Snitselaar <jsnitsel@...hat.com>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	Robin Murphy <robin.murphy@....com>,
	iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/1] iommu/amd: Fix sysfs leak in iommu init

During the iommu initialization, iommu_init_pci() adds sysfs nodes.
However, these nodes aren't remove in free_iommu_resources() subsequently.

Fixes: 39ab9555c241 ("iommu: Add sysfs bindings for struct iommu_device")
Signed-off-by: Kun(llfl) <llfl@...ux.alibaba.com>
---
 drivers/iommu/amd/init.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index ac6754a85f35..82a54898194a 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -1678,8 +1678,17 @@ static void __init free_pci_segments(void)
 	}
 }
 
+static void __init free_sysfs(struct amd_iommu *iommu)
+{
+	if (iommu->iommu.dev) {
+		iommu_device_unregister(&iommu->iommu);
+		iommu_device_sysfs_remove(&iommu->iommu);
+	}
+}
+
 static void __init free_iommu_one(struct amd_iommu *iommu)
 {
+	free_sysfs(iommu);
 	free_cwwb_sem(iommu);
 	free_command_buffer(iommu);
 	free_event_buffer(iommu);
-- 
2.43.0