linux-kernel - [PATCH] thunderbolt: debugfs: Fix dentry reference leaks in margining_port

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Message-Id: <20250901080438.2278730-1-linmq006@gmail.com>
Date: Mon,  1 Sep 2025 16:04:37 +0800
From: Miaoqian Lin <linmq006@...il.com>
To: Andreas Noever <andreas.noever@...il.com>,
	Michael Jamet <michael.jamet@...el.com>,
	Mika Westerberg <westeri@...nel.org>,
	Yehezkel Bernat <YehezkelShB@...il.com>,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: linmq006@...il.com,
	stable@...r.kernel.org
Subject: [PATCH] thunderbolt: debugfs: Fix dentry reference leaks in margining_port_init

The debugfs_lookup() function returns a dentry with an increased
reference count that must be released by calling dput().

Fixes: d0f1e0c2a699 ("thunderbolt: Add support for receiver lane margining")
Cc: stable@...r.kernel.org
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/thunderbolt/debugfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/thunderbolt/debugfs.c b/drivers/thunderbolt/debugfs.c
index f8328ca7e22e..2aadbec9a3e5 100644
--- a/drivers/thunderbolt/debugfs.c
+++ b/drivers/thunderbolt/debugfs.c
@@ -1770,6 +1770,7 @@ static void margining_port_init(struct tb_port *port)
 	port->usb4->margining = margining_alloc(port, &port->usb4->dev,
 						USB4_SB_TARGET_ROUTER, 0,
 						parent);
+	dput(parent);
 }
 
 static void margining_port_remove(struct tb_port *port)
-- 
2.35.1