linux-kernel - [PATCHv2 01/10] vfio/mdev: Avoid release parent reference during error path

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Message-Id: <20190430224937.57156-2-parav@mellanox.com>
Date:   Tue, 30 Apr 2019 17:49:28 -0500
From:   Parav Pandit <parav@...lanox.com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        kwankhede@...dia.com, alex.williamson@...hat.com
Cc:     cjia@...dia.com, parav@...lanox.com
Subject: [PATCHv2 01/10] vfio/mdev: Avoid release parent reference during error path

During mdev parent registration in mdev_register_device(),
if parent device is duplicate, it releases the reference of existing
parent device.
This is incorrect. Existing parent device should not be touched.

Fixes: 7b96953bc640 ("vfio: Mediated device Core driver")
Reviewed-by: Cornelia Huck <cohuck@...hat.com>
Reviewed By: Kirti Wankhede <kwankhede@...dia.com>
Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>
Signed-off-by: Parav Pandit <parav@...lanox.com>
---
 drivers/vfio/mdev/mdev_core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index b96fedc77ee5..1299d2e72ce2 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -181,6 +181,7 @@ int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
 	/* Check for duplicate */
 	parent = __find_parent_device(dev);
 	if (parent) {
+		parent = NULL;
 		ret = -EEXIST;
 		goto add_dev_err;
 	}
-- 
2.19.2