[PATCH 5.14 042/169] net: dsa: Fix an error handling path in dsa_switch_parse_ports_of()

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

From: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>

[ Upstream commit ba69fd9101f20a6d05a96ab743341d4e7b1a2178 ]

If we return before the end of the 'for_each_child_of_node()' iterator, the
reference taken on 'port' must be released.

Add the missing 'of_node_put()' calls.

Fixes: 83c0afaec7b7 ("net: dsa: Add new binding implementation")
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Link: https://lore.kernel.org/r/15d5310d1d55ad51c1af80775865306d92432e03.1634587046.git.christophe.jaillet@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/dsa/dsa2.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 76ed5ef0e36a..28326ca34b52 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -1283,12 +1283,15 @@ static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
 
 	for_each_available_child_of_node(ports, port) {
 		err = of_property_read_u32(port, "reg", &reg);
-		if (err)
+		if (err) {
+			of_node_put(port);
 			goto out_put_node;
+		}
 
 		if (reg >= ds->num_ports) {
 			dev_err(ds->dev, "port %pOF index %u exceeds num_ports (%zu)\n",
 				port, reg, ds->num_ports);
+			of_node_put(port);
 			err = -EINVAL;
 			goto out_put_node;
 		}
@@ -1296,8 +1299,10 @@ static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
 		dp = dsa_to_port(ds, reg);
 
 		err = dsa_port_parse_of(dp, port);
-		if (err)
+		if (err) {
+			of_node_put(port);
 			goto out_put_node;
+		}
 	}
 
 out_put_node:
-- 
2.33.0