linux-kernel - [PATCH] mm/damon/dbgfs: fix memory leak when using debugfs

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Message-Id: <20220902125631.128329-1-gregkh@linuxfoundation.org>
Date:   Fri,  2 Sep 2022 14:56:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     SeongJae Park <sj@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        damon@...ts.linux.dev, linux-mm@...ck.org,
        stable <stable@...nel.org>
Subject: [PATCH] mm/damon/dbgfs: fix memory leak when using debugfs_lookup()

When calling debugfs_lookup() the result must have dput() called on it,
otherwise the memory will leak over time.  Fix this up by properly
calling dput().

Cc: SeongJae Park <sj@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: damon@...ts.linux.dev
Cc: linux-mm@...ck.org
Cc: stable <stable@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 mm/damon/dbgfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c
index cb8a7e9926a4..dfb6ef8c83e0 100644
--- a/mm/damon/dbgfs.c
+++ b/mm/damon/dbgfs.c
@@ -915,6 +915,7 @@ static int dbgfs_rm_context(char *name)
 		new_ctxs[j++] = dbgfs_ctxs[i];
 	}
 
+	dput(dir);
 	kfree(dbgfs_dirs);
 	kfree(dbgfs_ctxs);
 
-- 
2.37.3