[PATCH AUTOSEL 6.2 10/64] USB: fix memory leak with using debugfs_lookup()

From: Sasha Levin
Date: Fri Mar 03 2023 - 16:42:05 EST


From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

[ 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@xxxxxxxxxxxxxxxxxxx>
Cc: Jilin Yuan <yuanjilin@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230106152828.3790902-1-gregkh@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 11b15d7b357ad..a415206cab043 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -998,7 +998,7 @@ 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