linux-kernel - [PATCH 5.10 454/563] device property: Fix fwnode_graph_devcon

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Date:   Mon, 24 Jan 2022 19:43:39 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 5.10 454/563] device property: Fix fwnode_graph_devcon_match() fwnode leak

From: Sakari Ailus <sakari.ailus@...ux.intel.com>

commit 4a7f4110f79163fd53ea65438041994ed615e3af upstream.

For each endpoint it encounters, fwnode_graph_devcon_match() checks
whether the endpoint's remote port parent device is available. If it is
not, it ignores the endpoint but does not put the reference to the remote
endpoint port parent fwnode. For available devices the fwnode handle
reference is put as expected.

Put the reference for unavailable devices now.

Fixes: 637e9e52b185 ("device connection: Find device connections also from device graphs")
Cc: 5.1+ <stable@...r.kernel.org> # 5.1+
Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/base/property.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -1195,8 +1195,10 @@ fwnode_graph_devcon_match(struct fwnode_
 
 	fwnode_graph_for_each_endpoint(fwnode, ep) {
 		node = fwnode_graph_get_remote_port_parent(ep);
-		if (!fwnode_device_is_available(node))
+		if (!fwnode_device_is_available(node)) {
+			fwnode_handle_put(node);
 			continue;
+		}
 
 		ret = match(node, con_id, data);
 		fwnode_handle_put(node);