From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Fri, 6 Jan 2023 15:28:28 +0000 (+0100)
Subject: USB: fix memory leak with using debugfs_lookup()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6683327b51a601daba32900072349dfa1d4e8fea;p=linux.git

USB: fix memory leak with using debugfs_lookup()

[ 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@rowland.harvard.edu>
Cc: Jilin Yuan <yuanjilin@cdjrlc.com>
Link: https://lore.kernel.org/r/20230106152828.3790902-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

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);
 }
 
 /*