linux-kernel - [PATCH AUTOSEL 6.1 36/60] USB: gadget: lpc32xx_udc: fix memory leak with using debugfs

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Date:   Fri,  3 Mar 2023 16:42:50 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jakob Koschel <jakobkoschel@...il.com>,
        Miaoqian Lin <linmq006@...il.com>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Sasha Levin <sashal@...nel.org>, linux-usb@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.1 36/60] USB: gadget: lpc32xx_udc: fix memory leak with using debugfs_lookup()

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

[ Upstream commit e3965acaf3739fde9d74ad82979b46d37c6c208f ]

When calling debugfs_lookup() the result must have dput() called on it,
otherwise the memory will leak over time.  To make things simpler, just
call debugfs_lookup_and_remove() instead which handles all of the logic
at once.

Cc: Jakob Koschel <jakobkoschel@...il.com>
Cc: Miaoqian Lin <linmq006@...il.com>
Acked-by: Vladimir Zapolskiy <vz@...ia.com>
Link: https://lore.kernel.org/r/20230202153235.2412790-10-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/gadget/udc/lpc32xx_udc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/lpc32xx_udc.c b/drivers/usb/gadget/udc/lpc32xx_udc.c
index cea10cdb83ae5..fe62db32dd0eb 100644
--- a/drivers/usb/gadget/udc/lpc32xx_udc.c
+++ b/drivers/usb/gadget/udc/lpc32xx_udc.c
@@ -532,7 +532,7 @@ static void create_debug_file(struct lpc32xx_udc *udc)
 
 static void remove_debug_file(struct lpc32xx_udc *udc)
 {
-	debugfs_remove(debugfs_lookup(debug_filename, NULL));
+	debugfs_lookup_and_remove(debug_filename, NULL);
 }
 
 #else
-- 
2.39.2