linux-kernel - [PATCH v2 1/2] vfio: platform: Fix reset module leak in error path

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Message-Id: <1523375627-23746-2-git-send-email-geert+renesas@glider.be>
Date:   Tue, 10 Apr 2018 17:53:46 +0200
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Baptiste Reynal <b.reynal@...tualopensystems.com>,
        Alex Williamson <alex.williamson@...hat.com>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, kvm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH v2 1/2] vfio: platform: Fix reset module leak in error path

If the IOMMU group setup fails, the reset module is not released.

Fixes: b5add544d677d363 ("vfio, platform: make reset driver a requirement by default")
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
Reviewed-by: Eric Auger <eric.auger@...hat.com>
---
v2:
  - Add Reviewed-by.
---
 drivers/vfio/platform/vfio_platform_common.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index 35469af87f88678e..b60bb5326668498c 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -680,18 +680,23 @@ int vfio_platform_probe_common(struct vfio_platform_device *vdev,
 	group = vfio_iommu_group_get(dev);
 	if (!group) {
 		pr_err("VFIO: No IOMMU group for device %s\n", vdev->name);
-		return -EINVAL;
+		ret = -EINVAL;
+		goto put_reset;
 	}
 
 	ret = vfio_add_group_dev(dev, &vfio_platform_ops, vdev);
-	if (ret) {
-		vfio_iommu_group_put(group, dev);
-		return ret;
-	}
+	if (ret)
+		goto put_iommu;
 
 	mutex_init(&vdev->igate);
 
 	return 0;
+
+put_iommu:
+	vfio_iommu_group_put(group, dev);
+put_reset:
+	vfio_platform_put_reset(vdev);
+	return ret;
 }
 EXPORT_SYMBOL_GPL(vfio_platform_probe_common);
 
-- 
2.7.4