linux-kernel - [PATCH 5.11 223/775] media: software_node: Fix refcounts in software_node_get_next

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Date:   Mon,  1 Mar 2021 17:06:31 +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,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 223/775] media: software_node: Fix refcounts in software_node_get_next_child()

From: Daniel Scally <djrscally@...il.com>

[ Upstream commit fb5ec981adf08b94e6ce27ca16b7765c94f4513c ]

The software_node_get_next_child() function currently does not hold
references to the child software_node that it finds or put the ref that
is held against the old child - fix that.

Fixes: 59abd83672f7 ("drivers: base: Introducing software nodes to the firmware node framework")
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Daniel Scally <djrscally@...il.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/base/swnode.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index 4a4b2008fbc26..4fcc1a6fb724c 100644
--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -443,14 +443,18 @@ software_node_get_next_child(const struct fwnode_handle *fwnode,
 	struct swnode *c = to_swnode(child);
 
 	if (!p || list_empty(&p->children) ||
-	    (c && list_is_last(&c->entry, &p->children)))
+	    (c && list_is_last(&c->entry, &p->children))) {
+		fwnode_handle_put(child);
 		return NULL;
+	}
 
 	if (c)
 		c = list_next_entry(c, entry);
 	else
 		c = list_first_entry(&p->children, struct swnode, entry);
-	return &c->fwnode;
+
+	fwnode_handle_put(child);
+	return fwnode_handle_get(&c->fwnode);
 }
 
 static struct fwnode_handle *
-- 
2.27.0