[PATCH] net: stmmac: dwmac-sun8i: Fix EPHY clock leak in get_ephy_nodes()

[Wentao Liang]

get_ephy_nodes() stores the clock returned by of_clk_get() directly in
gmac->ephy_clk before the reset control is obtained. When the reset
lookup fails, the loop continues or returns without releasing that
clock, and sun8i_dwmac_probe() then jumps to dwmac_remove, which does
not call clk_put(). Keep the clock in a local variable and release it
on the error paths.

Fixes: 634db83b8265 ("net: stmmac: dwmac-sun8i: Handle integrated/external MDIOs")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Wentao Liang <vulab@xxxxxxxxxxx>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
index 48c52eb96233..38d7e71de925 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
@@ -783,18 +783,22 @@ static int get_ephy_nodes(struct stmmac_priv *priv)
 
 	/* Seek for internal PHY */
 	for_each_child_of_node_scoped(mdio_internal, iphynode) {
-		gmac->ephy_clk = of_clk_get(iphynode, 0);
-		if (IS_ERR(gmac->ephy_clk))
+		struct clk *ephy_clk;
+
+		ephy_clk = of_clk_get(iphynode, 0);
+		if (IS_ERR(ephy_clk))
 			continue;
 		gmac->rst_ephy = of_reset_control_get_exclusive(iphynode, NULL);
 		if (IS_ERR(gmac->rst_ephy)) {
 			ret = PTR_ERR(gmac->rst_ephy);
+			clk_put(ephy_clk);
 			if (ret == -EPROBE_DEFER) {
 				of_node_put(mdio_internal);
 				return ret;
 			}
 			continue;
 		}
+		gmac->ephy_clk = ephy_clk;
 		dev_info(priv->device, "Found internal PHY node\n");
 		of_node_put(mdio_internal);
 		return 0;
-- 
2.34.1