diff options
| author | Ben Hutchings <ben.hutchings@codethink.co.uk> | 2015-01-16 20:51:25 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-01-19 23:37:40 +0300 |
| commit | 4f9dce230b32eec45cec8c28cae61efdfa2f7d57 (patch) | |
| tree | 685c3ae92315b1627d99a9b72e6906031f3baba8 /drivers/net | |
| parent | b37feed7c2803cce71a746623594f19bbb5a21aa (diff) | |
| download | linux-4f9dce230b32eec45cec8c28cae61efdfa2f7d57.tar.xz | |
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@codethink.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ethernet/renesas/sh_eth.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c index 01dfae4fece0..6576243222af 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); |