linux-kernel - [PATCH] Bluetooth: fix error handling in hci_register

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Message-Id: <20250313083135.307357-1-make24@iscas.ac.cn>
Date: Thu, 13 Mar 2025 16:31:35 +0800
From: Ma Ke <make24@...as.ac.cn>
To: marcel@...tmann.org,
	johan.hedberg@...il.com,
	luiz.dentz@...il.com
Cc: linux-bluetooth@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org,
	Ma Ke <make24@...as.ac.cn>,
	stable@...r.kernel.org
Subject: [PATCH] Bluetooth: fix error handling in hci_register_dev()

Once device_add() failed, we should call put_device() to decrement
reference count for cleanup. Or it could cause memory leak.

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: 54506918059a ("Bluetooth: Move SMP initialization after HCI init")
Signed-off-by: Ma Ke <make24@...as.ac.cn>
---
 net/bluetooth/hci_core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index e7ec12437c8b..c03fd16d3c46 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2641,6 +2641,7 @@ int hci_register_dev(struct hci_dev *hdev)
 	return id;
 
 err_wqueue:
+	put_device(&hdev->dev);
 	debugfs_remove_recursive(hdev->debugfs);
 	destroy_workqueue(hdev->workqueue);
 	destroy_workqueue(hdev->req_workqueue);
-- 
2.25.1