linux-kernel - [PATCH 3/3] HID: wacom: fix kobject reference count leak

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Message-Id: <20250430173911.84705-4-qasdev00@gmail.com>
Date: Wed, 30 Apr 2025 18:39:11 +0100
From: Qasim Ijaz <qasdev00@...il.com>
To: ping.cheng@...om.com,
	jason.gerecke@...om.com,
	jikos@...nel.org,
	bentiss@...nel.org,
	linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Qasim Ijaz <qasdev00@...il.com>,
	stable@...r.kernel.org
Subject: [PATCH 3/3] HID: wacom: fix kobject reference count leak

When sysfs_create_files() fails in wacom_initialize_remotes() the error
is returned and the cleanup action will not have been registered yet.

As a result the kobject’s refcount is never dropped, so the
kobject can never be freed leading to a reference leak.

Fix this by calling kobject_put() before returning.

Fixes: 83e6b40e2de6 ("HID: wacom: EKR: have the wacom resources dynamically allocated")
Cc: stable@...r.kernel.org
Signed-off-by: Qasim Ijaz <qasdev00@...il.com>
---
 drivers/hid/wacom_sys.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index 58cbd43a37e9..1257131b1e34 100644
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -2059,6 +2059,7 @@ static int wacom_initialize_remotes(struct wacom *wacom)
 		hid_err(wacom->hdev,
 			"cannot create sysfs group err: %d\n", error);
 		kfifo_free(&remote->remote_fifo);
+		kobject_put(remote->remote_dir);
 		return error;
 	}
 
-- 
2.39.5