linux-kernel - [PATCH] vfio: check vfio_register_iommu

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Date:   Tue, 21 Jun 2022 02:21:12 -0400
From:   Bo Liu <liubo03@...pur.com>
To:     <alex.williamson@...hat.com>, <cohuck@...hat.com>
CC:     <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Bo Liu <liubo03@...pur.com>
Subject: [PATCH] vfio: check vfio_register_iommu_driver() return value

As vfio_register_iommu_driver() can fail, we should check the return value.

Signed-off-by: Bo Liu <liubo03@...pur.com>
---
 drivers/vfio/vfio.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 61e71c1154be..7d4b6dfafd27 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -2159,10 +2159,16 @@ static int __init vfio_init(void)
 	pr_info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 
 #ifdef CONFIG_VFIO_NOIOMMU
-	vfio_register_iommu_driver(&vfio_noiommu_ops);
+	ret = vfio_register_iommu_driver(&vfio_noiommu_ops);
+	if (ret)
+		goto err_driver_register;
 #endif
 	return 0;
 
+#ifdef CONFIG_VFIO_NOIOMMU
+err_driver_register:
+	unregister_chrdev_region(vfio.group_devt, MINORMASK + 1);
+#endif
 err_alloc_chrdev:
 	class_destroy(vfio.class);
 	vfio.class = NULL;
-- 
2.27.0