From aed13f2e00ce278f039b76e7ac84d419aff48ef6 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Wed, 16 Jan 2019 11:23:33 +0100 Subject: [PATCH] net: dsa: lantiq_gswip: fix use-after-free on failed probe Make sure to disable and deregister the switch on late probe errors to avoid use-after-free when the device-resource-managed switch is freed. Fixes: 14fceff4771e ("net: dsa: Add Lantiq / Intel DSA driver for vrx200") Cc: stable # 4.20 Cc: Hauke Mehrtens Signed-off-by: Johan Hovold Reviewed-by: Andrew Lunn Acked-by: Hauke Mehrtens Signed-off-by: David S. Miller --- drivers/net/dsa/lantiq_gswip.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c index 693a67f45bef..b06c41c98de9 100644 --- a/drivers/net/dsa/lantiq_gswip.c +++ b/drivers/net/dsa/lantiq_gswip.c @@ -1099,7 +1099,7 @@ static int gswip_probe(struct platform_device *pdev) dev_err(dev, "wrong CPU port defined, HW only supports port: %i", priv->hw_info->cpu_port); err = -EINVAL; - goto mdio_bus; + goto disable_switch; } platform_set_drvdata(pdev, priv); @@ -1109,6 +1109,9 @@ static int gswip_probe(struct platform_device *pdev) (version & GSWIP_VERSION_MOD_MASK) >> GSWIP_VERSION_MOD_SHIFT); return 0; +disable_switch: + gswip_mdio_mask(priv, GSWIP_MDIO_GLOB_ENABLE, 0, GSWIP_MDIO_GLOB); + dsa_unregister_switch(priv->ds); mdio_bus: if (mdio_np) mdiobus_unregister(priv->ds->slave_mii_bus);