phy: core: Fix an OF node refcount leakage in _of_phy_get()

_of_phy_get() will directly return when suffers of_device_is_compatible()
error, but it forgets to decrease refcount of OF node @args.np before error
return, the refcount was increased by previous of_parse_phandle_with_args()
so causes the OF node's refcount leakage.

Fix by decreasing the refcount via of_node_put() before the error return.

Fixes: b7563e2796f8 ("phy: work around 'phys' references to usb-nop-xceiv devices")
Cc: stable@vger.kernel.org
Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Link: https://lore.kernel.org/r/20241213-phy_core_fix-v6-4-40ae28f5015a@quicinc.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 52ca590a58b9c303b21bf892565612a7ab92c095..b88fbda6c046174b7abd0a0435ec54763e9f42bc 100644 (file)
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -629,8 +629,10 @@ static struct phy *_of_phy_get(struct device_node *np, int index)
                return ERR_PTR(-ENODEV);
 
        /* This phy type handled by the usb-phy subsystem for now */
-       if (of_device_is_compatible(args.np, "usb-nop-xceiv"))
-               return ERR_PTR(-ENODEV);
+       if (of_device_is_compatible(args.np, "usb-nop-xceiv")) {
+               phy = ERR_PTR(-ENODEV);
+               goto out_put_node;
+       }
 
        mutex_lock(&phy_provider_mutex);
        phy_provider = of_phy_provider_lookup(args.np);
@@ -652,6 +654,7 @@ out_put_module:
 
 out_unlock:
        mutex_unlock(&phy_provider_mutex);
+out_put_node:
        of_node_put(args.np);
 
        return phy;