linux-kernel - [PATCH AUTOSEL 5.15 08/50] USB: fix memory leak with using debugfs

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Date:   Fri,  3 Mar 2023 16:44:49 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Jilin Yuan <yuanjilin@...rlc.com>,
        Sasha Levin <sashal@...nel.org>, hdegoede@...hat.com,
        vkoul@...nel.org, mchehab@...nel.org, linux-usb@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 08/50] USB: fix memory leak with using debugfs_lookup()

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

[ Upstream commit 30374434edab20e25776f8ecb4bc9d1e54309487 ]

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: Alan Stern <stern@...land.harvard.edu>
Cc: Jilin Yuan <yuanjilin@...rlc.com>
Link: https://lore.kernel.org/r/20230106152828.3790902-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/core/usb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 62368c4ed37af..cc36f9f228148 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -1036,7 +1036,7 @@ static void usb_debugfs_init(void)
 
 static void usb_debugfs_cleanup(void)
 {
-	debugfs_remove(debugfs_lookup("devices", usb_debug_root));
+	debugfs_lookup_and_remove("devices", usb_debug_root);
 }
 
 /*
-- 
2.39.2