misc: vmw_balloon: fix memory leak with using debugfs_lookup()

[ Upstream commit 209cdbd07cfaa4b7385bad4eeb47e5ec1887d33d ]

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@vmware.com>
Cc: VMware PV-Drivers Reviewers <pv-drivers@vmware.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20230202141100.2291188-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
index f1d8ba6d485741336d48382dc00dd2d59f4fe630..dab8ad9fed6b39e4f6d3f06e3981a24305c9f9c4 100644 (file)
--- a/drivers/misc/vmw_balloon.c
+++ b/drivers/misc/vmw_balloon.c
@@ -1711,7 +1711,7 @@ 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;
 }