net: dsa: Fix an error handling path in 'dsa_switch_parse_ports_of()'

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@wanadoo.fr>
Link: https://lore.kernel.org/r/15d5310d1d55ad51c1af80775865306d92432e03.1634587046.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index da18094b5a049b0e5e77c74c881cc15aa2ffe206..e9911b18bdbfa3f1d2b60a644754790cdd8404c9 100644 (file)
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -1374,12 +1374,15 @@ 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;
                }
@@ -1387,8 +1390,10 @@ 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: