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net: ti: icssg_prueth: Fix NULL pointer dereference in prueth_probe()

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commit b31c7e7808 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: 128d5874c0 ("net: ti: icssg-prueth: Add ICSSG ethernet driver")
Cc: stable@vger.kernel.org
Signed-off-by: Romain Gantois <romain.gantois@bootlin.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: MD Danish Anwar <danishanwar@ti.com>
Link: https://lore.kernel.org/r/20240521-icssg-prueth-fix-v1-1-b4b17b1433e9@bootlin.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Romain Gantois 2024-05-21 14:44:11 +02:00 committed by Greg Kroah-Hartman
parent f678c3c336
commit 5cd17f0e74
1 changed files with 12 additions and 2 deletions
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14
drivers/net/ethernet/ti/icssg/icssg_prueth.c
View File

@ -2136,7 +2136,12 @@ static int prueth_probe(struct platform_device *pdev)
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);
}
@ -2148,7 +2153,12 @@ static int prueth_probe(struct platform_device *pdev)
}
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);
}