[PATCH 6.9 023/427] net: ti: icssg_prueth: Fix NULL pointer dereference in prueth_probe()

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6.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Romain Gantois <romain.gantois@xxxxxxxxxxx>

commit b31c7e78086127a7fcaa761e8d336ee855a920c6 upstream.

In the prueth_probe() function, if one of the calls to emac_phy_connect()
fails due to of_phy_connect() returning NULL, then the subsequent call to
phy_attached_info() will dereference a NULL pointer.

Check the return code of emac_phy_connect and fail cleanly if there is an
error.

Fixes: 128d5874c082 ("net: ti: icssg-prueth: Add ICSSG ethernet driver")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Romain Gantois <romain.gantois@xxxxxxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
Reviewed-by: MD Danish Anwar <danishanwar@xxxxxx>
Link: https://lore.kernel.org/r/20240521-icssg-prueth-fix-v1-1-b4b17b1433e9@xxxxxxxxxxx
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/ethernet/ti/icssg/icssg_prueth.c |   14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/ti/icssg/icssg_prueth.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
@@ -2152,7 +2152,12 @@ static int prueth_probe(struct platform_
 
 		prueth->registered_netdevs[PRUETH_MAC0] = prueth->emac[PRUETH_MAC0]->ndev;
 
-		emac_phy_connect(prueth->emac[PRUETH_MAC0]);
+		ret = emac_phy_connect(prueth->emac[PRUETH_MAC0]);
+		if (ret) {
+			dev_err(dev,
+				"can't connect to MII0 PHY, error -%d", ret);
+			goto netdev_unregister;
+		}
 		phy_attached_info(prueth->emac[PRUETH_MAC0]->ndev->phydev);
 	}
 
@@ -2164,7 +2169,12 @@ static int prueth_probe(struct platform_
 		}
 
 		prueth->registered_netdevs[PRUETH_MAC1] = prueth->emac[PRUETH_MAC1]->ndev;
-		emac_phy_connect(prueth->emac[PRUETH_MAC1]);
+		ret = emac_phy_connect(prueth->emac[PRUETH_MAC1]);
+		if (ret) {
+			dev_err(dev,
+				"can't connect to MII1 PHY, error %d", ret);
+			goto netdev_unregister;
+		}
 		phy_attached_info(prueth->emac[PRUETH_MAC1]->ndev->phydev);
 	}
 






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