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Date: Fri, 16 Jan 2015 17:51:25 +0000 From: Ben Hutchings <ben.hutchings@...ethink.co.uk> To: ct178-internal@...ts.codethink.co.uk, "David S. Miller" <davem@...emloft.net> Cc: netdev@...r.kernel.org, linux-kernel@...ts.codethink.co.uk, Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com>, Mitsuhiro Kimura <mitsuhiro.kimura.kc@...esas.com>, Hisashi Nakamura <hisashi.nakamura.ak@...esas.com>, Yoshihiro Kaneko <ykaneko0929@...il.com> Subject: [PATCH net 2/2] sh_eth: Fix ethtool operation crash when net device is down The driver connects and disconnects the PHY device whenever the net device is brought up and down. The ethtool get_settings, set_settings and nway_reset operations will dereference a null or dangling pointer if called while it is down. I think it would be preferable to keep the PHY connected, but there may be good reasons not to. As an immediate fix for this bug: - Set the phydev pointer to NULL after disconnecting the PHY - Change those three operations to return -ENODEV while the PHY is not connected Signed-off-by: Ben Hutchings <ben.hutchings@...ethink.co.uk> --- drivers/net/ethernet/renesas/sh_eth.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c index 0c4d5b5..28e3822 100644 --- a/drivers/net/ethernet/renesas/sh_eth.c +++ b/drivers/net/ethernet/renesas/sh_eth.c @@ -1827,6 +1827,9 @@ static int sh_eth_get_settings(struct net_device *ndev, unsigned long flags; int ret; + if (!mdp->phydev) + return -ENODEV; + spin_lock_irqsave(&mdp->lock, flags); ret = phy_ethtool_gset(mdp->phydev, ecmd); spin_unlock_irqrestore(&mdp->lock, flags); @@ -1841,6 +1844,9 @@ static int sh_eth_set_settings(struct net_device *ndev, unsigned long flags; int ret; + if (!mdp->phydev) + return -ENODEV; + spin_lock_irqsave(&mdp->lock, flags); /* disable tx and rx */ @@ -1875,6 +1881,9 @@ static int sh_eth_nway_reset(struct net_device *ndev) unsigned long flags; int ret; + if (!mdp->phydev) + return -ENODEV; + spin_lock_irqsave(&mdp->lock, flags); ret = phy_start_aneg(mdp->phydev); spin_unlock_irqrestore(&mdp->lock, flags); @@ -2184,6 +2193,7 @@ static int sh_eth_close(struct net_device *ndev) if (mdp->phydev) { phy_stop(mdp->phydev); phy_disconnect(mdp->phydev); + mdp->phydev = NULL; } free_irq(ndev->irq, ndev); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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