[PATCH] net: stmmac: platform: fix of_node leak when breaking RX queue loop

[Linkai Gong]

for_each_child_of_node() on the RX queues breaks once enough queues are
parsed, which leaves the current child referenced. The TX loop then
overwrites q_node, so that reference is never dropped.

of_node_put() the child before breaking. The TX loop already drops its
last reference via the of_node_put(q_node) at the out label.

Fixes: d976a525c371 ("net: stmmac: multiple queues dt configuration")
Signed-off-by: Linkai Gong <gonglinkai@xxxxxxxxxx>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index dc5f951a311d..66a048ecadb0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -170,8 +170,11 @@ static int stmmac_mtl_setup(struct platform_device *pdev,
 
 	/* Processing individual RX queue config */
 	for_each_child_of_node(rx_node, q_node) {
-		if (queue >= plat->rx_queues_to_use)
+		if (queue >= plat->rx_queues_to_use) {
+			of_node_put(q_node);
+			q_node = NULL;
 			break;
+		}
 
 		if (of_property_read_bool(q_node, "snps,dcb-algorithm"))
 			plat->rx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;
-- 
2.25.1