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authorBen Hutchings <ben.hutchings@codethink.co.uk>2015-01-16 17:51:25 +0000
committerDavid S. Miller <davem@davemloft.net>2015-01-19 15:37:40 -0500
commit4f9dce230b32eec45cec8c28cae61efdfa2f7d57 (patch)
tree685c3ae92315b1627d99a9b72e6906031f3baba8
parentb37feed7c2803cce71a746623594f19bbb5a21aa (diff)
downloadlinux-4f9dce230b32eec45cec8c28cae61efdfa2f7d57.tar.gz
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>
-rw-r--r--drivers/net/ethernet/renesas/sh_eth.c10
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 01dfae4fece..6576243222a 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);