[v2] media: v4l2-core: Fix a potential resource leak in v4l2_fwnode_parse_link()
Commit Message
If fwnode_graph_get_remote_endpoint() fails, 'fwnode' is known to be NULL,
so fwnode_handle_put() is a no-op.
Release the reference taken from a previous fwnode_graph_get_port_parent()
call instead.
Also handle fwnode_graph_get_port_parent() failures.
In order to fix these issues, add an error handling path to the function
and the needed gotos.
Fixes: ca50c197bd96 ("[media] v4l: fwnode: Support generic fwnode for parsing standardised properties")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
v2: - Handle fwnode_graph_get_port_parent() errors [Sakari Ailus <sakari.ailus@linux.intel.com>]
- Rephrase the commit log
v1: https://lore.kernel.org/all/2ddd10ec9e009bbb85518355f1e09e1ecd349925.1685340968.git.christophe.jaillet@wanadoo.fr/
---
drivers/media/v4l2-core/v4l2-fwnode.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
@@ -568,19 +568,29 @@ int v4l2_fwnode_parse_link(struct fwnode_handle *fwnode,
link->local_id = fwep.id;
link->local_port = fwep.port;
link->local_node = fwnode_graph_get_port_parent(fwnode);
+ if (!link->local_node)
+ return -ENOLINK;
fwnode = fwnode_graph_get_remote_endpoint(fwnode);
- if (!fwnode) {
- fwnode_handle_put(fwnode);
- return -ENOLINK;
- }
+ if (!fwnode)
+ goto err_put_local_node;
fwnode_graph_parse_endpoint(fwnode, &fwep);
link->remote_id = fwep.id;
link->remote_port = fwep.port;
link->remote_node = fwnode_graph_get_port_parent(fwnode);
+ if (!link->remote_node)
+ goto err_put_remote_endpoint;
return 0;
+
+err_put_remote_endpoint:
+ fwnode_handle_put(fwnode);
+
+err_put_local_node:
+ fwnode_handle_put(link->local_node);
+
+ return -ENOLINK;
}
EXPORT_SYMBOL_GPL(v4l2_fwnode_parse_link);