linux-kernel - [PATCH 4.4 278/312] net: ethernet: ti: cpsw: fix device and of

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Date:   Fri,  8 May 2020 14:34:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mugunthan V N <mugunthanvnm@...com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        linux-omap@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.4 278/312] net: ethernet: ti: cpsw: fix device and of_node leaks

From: Johan Hovold <johan@...nel.org>

commit c7262aaace1b17a650598063e3b9ee1785fde377 upstream.

Make sure to drop the references taken by of_get_child_by_name() and
bus_find_device() before returning from cpsw_phy_sel().

Note that holding a reference to the cpsw-phy-sel device does not
prevent the devres-managed private data from going away.

Fixes: 5892cd135e16 ("drivers: net: cpsw-phy-sel: Add new driver...")
Cc: Mugunthan V N <mugunthanvnm@...com>
Cc: Grygorii Strashko <grygorii.strashko@...com>
Cc: linux-omap@...r.kernel.org
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/ethernet/ti/cpsw-phy-sel.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/ethernet/ti/cpsw-phy-sel.c
+++ b/drivers/net/ethernet/ti/cpsw-phy-sel.c
@@ -154,9 +154,12 @@ void cpsw_phy_sel(struct device *dev, ph
 	}

 	dev = bus_find_device(&platform_bus_type, NULL, node, match);
+	of_node_put(node);
 	priv = dev_get_drvdata(dev);

 	priv->cpsw_phy_sel(priv, phy_mode, slave);
+
+	put_device(dev);
 }
 EXPORT_SYMBOL_GPL(cpsw_phy_sel);