linux-kernel - [PATCH] misc: vmw_balloon: fix memory leak with using debugfs

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Date:   Thu,  2 Feb 2023 15:11:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nadav Amit <namit@...are.com>,
        VMware PV-Drivers Reviewers <pv-drivers@...are.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH] misc: vmw_balloon: fix memory leak with using debugfs_lookup()

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: Nadav Amit <namit@...are.com>
Cc: VMware PV-Drivers Reviewers <pv-drivers@...are.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/misc/vmw_balloon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
index 61a2be712bf7..9ce9b9e0e9b6 100644
--- a/drivers/misc/vmw_balloon.c
+++ b/drivers/misc/vmw_balloon.c
@@ -1709,7 +1709,7 @@ static void __init vmballoon_debugfs_init(struct vmballoon *b)
 static void __exit vmballoon_debugfs_exit(struct vmballoon *b)
 {
 	static_key_disable(&balloon_stat_enabled.key);
-	debugfs_remove(debugfs_lookup("vmmemctl", NULL));
+	debugfs_lookup_and_remove("vmmemctl", NULL);
 	kfree(b->stats);
 	b->stats = NULL;
 }
-- 
2.39.1