linux-kernel - [PATCH] usb: core: add missing of_node_put() in usb_of_has_devices_or

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Message-Id: <20240624-usb_core_of_memleak-v1-1-af6821c1a584@gmail.com>
Date: Mon, 24 Jun 2024 23:10:06 +0200
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Stephen Boyd <swboyd@...omium.org>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
 stable@...r.kernel.org, Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: [PATCH] usb: core: add missing of_node_put() in
 usb_of_has_devices_or_graph

The for_each_child_of_node() macro requires an explicit call to
of_node_put() on early exits to decrement the child refcount and avoid a
memory leak.
The child node is not required outsie the loop, and the resource must be
released before the function returns.

Add the missing of_node_put().

Cc: stable@...r.kernel.org
Fixes: 82e82130a78b ("usb: core: Set connect_type of ports based on DT node")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
This bug was found while doing some code analysis, and I could not test
it with real hardware. Although the issue and it solution are
straightforward, any validation beyond compilation and static analysis
is always welcome.
---
 drivers/usb/core/of.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/core/of.c b/drivers/usb/core/of.c
index f1a499ee482c..763e4122ed5b 100644
--- a/drivers/usb/core/of.c
+++ b/drivers/usb/core/of.c
@@ -84,9 +84,12 @@ static bool usb_of_has_devices_or_graph(const struct usb_device *hub)
 	if (of_graph_is_present(np))
 		return true;
 
-	for_each_child_of_node(np, child)
-		if (of_property_present(child, "reg"))
+	for_each_child_of_node(np, child) {
+		if (of_property_present(child, "reg")) {
+			of_node_put(child);
 			return true;
+		}
+	}
 
 	return false;
 }

---
base-commit: 62c97045b8f720c2eac807a5f38e26c9ed512371
change-id: 20240624-usb_core_of_memleak-79161623b62e

Best regards,
-- 
Javier Carrasco <javier.carrasco.cruz@...il.com>