linux-kernel - [PATCH v2] virtio: fix reference leak in register_virtio

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Message-Id: <20241218031201.2968918-1-make_ruc2021@163.com>
Date: Wed, 18 Dec 2024 11:12:01 +0800
From: Ma Ke <make_ruc2021@....com>
To: mst@...hat.com,
	jasowang@...hat.com,
	xuanzhuo@...ux.alibaba.com,
	eperezma@...hat.com,
	zhangweiping@...ichuxing.com,
	cohuck@...hat.com
Cc: virtualization@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Ma Ke <make_ruc2021@....com>,
	stable@...r.kernel.org
Subject: [PATCH v2] virtio: fix reference leak in register_virtio_device()

Once device_add(&dev->dev) failed, call put_device() to explicitly
release dev->dev. Or it could cause double free problem.

As comment of device_add() says, 'if device_add() succeeds, you should
call device_del() when you want to get rid of it. If device_add() has
not succeeded, use only put_device() to drop the reference count'.

Found by code review.

Cc: stable@...r.kernel.org
Fixes: f2b44cde7e16 ("virtio: split device_register into device_initialize and device_add")
Signed-off-by: Ma Ke <make_ruc2021@....com>
---
Changes in v2:
- modified the bug description to make it more clear;
- changed the Fixes tag.
---
 drivers/virtio/virtio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index b9095751e43b..ac721b5597e8 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -503,6 +503,7 @@ int register_virtio_device(struct virtio_device *dev)
 
 out_of_node_put:
 	of_node_put(dev->dev.of_node);
+	put_device(&dev->dev);
 out_ida_remove:
 	ida_free(&virtio_index_ida, dev->index);
 out:
-- 
2.25.1