linux-kernel - [PATCH 1/2] rapidio: fix possible name leaks when rio_add

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Date:   Mon, 14 Nov 2022 23:26:35 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <mporter@...nel.crashing.org>, <alex.bou9@...il.com>,
        <akpm@...ux-foundation.org>
Subject: [PATCH 1/2] rapidio: fix possible name leaks when rio_add_device() fails

If rio_add_device() returns error, the name allocated by
dev_set_name() need be freed. It should use put_device()
to give up the reference in the error path, so that the
name can be freed in kobject_cleanup(), and the 'rdev' can
be freed in rio_release_dev().

Fixes: e8de370188d0 ("rapidio: add mport char device driver")
Fixes: 1fa5ae857bb1 ("driver core: get rid of struct device's bus_id string array")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/rapidio/devices/rio_mport_cdev.c | 7 +++++--
 drivers/rapidio/rio-scan.c               | 8 ++++++--
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/rapidio/devices/rio_mport_cdev.c b/drivers/rapidio/devices/rio_mport_cdev.c
index 683457d8cb65..1170c0a66d21 100644
--- a/drivers/rapidio/devices/rio_mport_cdev.c
+++ b/drivers/rapidio/devices/rio_mport_cdev.c
@@ -1804,8 +1804,11 @@ static int rio_mport_add_riodev(struct mport_cdev_priv *priv,
 		rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
 				   0, 0xffff);
 	err = rio_add_device(rdev);
-	if (err)
-		goto cleanup;
+	if (err) {
+		put_device(&rdev->dev);
+		return err;
+	}
+
 	rio_dev_get(rdev);
 
 	return 0;
diff --git a/drivers/rapidio/rio-scan.c b/drivers/rapidio/rio-scan.c
index 2350c0cb2329..03615eb2d3d7 100644
--- a/drivers/rapidio/rio-scan.c
+++ b/drivers/rapidio/rio-scan.c
@@ -454,8 +454,12 @@ static struct rio_dev *rio_setup_device(struct rio_net *net,
 				   0, 0xffff);
 
 	ret = rio_add_device(rdev);
-	if (ret)
-		goto cleanup;
+	if (ret) {
+		if (rswitch)
+			kfree(rswitch->route_table);
+		put_device(&rdev->dev);
+		return NULL;
+	}
 
 	rio_dev_get(rdev);
 
-- 
2.25.1