linux-kernel - [PATCH] media: v4l2-core: Fix a potential resource leak in v4l2_fwnode_parse

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Date:   Mon, 29 May 2023 08:17:18 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-media@...r.kernel.org
Subject: [PATCH] media: v4l2-core: Fix a potential resource leak in v4l2_fwnode_parse_link()

'fwnode is known to be NULL, at this point, so fwnode_handle_put() is a
no-op.

Release the reference taken from a previous fwnode_graph_get_port_parent()
call instead.

Fixes: ca50c197bd96 ("[media] v4l: fwnode: Support generic fwnode for parsing standardised properties")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
/!\  THIS PATCH IS SPECULATIVE  /!\
         review with care
---
 drivers/media/v4l2-core/v4l2-fwnode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c
index 049c2f2001ea..b7dd467c53fd 100644
--- a/drivers/media/v4l2-core/v4l2-fwnode.c
+++ b/drivers/media/v4l2-core/v4l2-fwnode.c
@@ -571,7 +571,7 @@ int v4l2_fwnode_parse_link(struct fwnode_handle *fwnode,
 
 	fwnode = fwnode_graph_get_remote_endpoint(fwnode);
 	if (!fwnode) {
-		fwnode_handle_put(fwnode);
+		fwnode_handle_put(link->local_node);
 		return -ENOLINK;
 	}
 
-- 
2.34.1