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net: ethtool: Return -EOPNOTSUPP if user space tries to read EEPROM with lengh 0 

If a driver supports reading EEPROM but no EEPROM is installed in the system,
the driver's get_eeprom_len function returns 0. ethtool will subsequently
try to read that zero-length EEPROM anyway. If the driver does not support
EEPROM access at all, this operation will return -EOPNOTSUPP. If the driver
does support EEPROM access but no EEPROM is installed, the operation will
return -EINVAL. Return -EOPNOTSUPP in both cases for consistency.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Guenter Roeck 2014-10-30 20:50:15 -07:00 committed by David S. Miller
parent 1e19e084ea
commit e0fb6fb6d5
1 changed files with 4 additions and 2 deletions
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6
net/core/ethtool.c
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@ -1036,7 +1036,8 @@ static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
{
const struct ethtool_ops *ops = dev->ethtool_ops;
if (!ops->get_eeprom || !ops->get_eeprom_len)
if (!ops->get_eeprom || !ops->get_eeprom_len ||
!ops->get_eeprom_len(dev))
return -EOPNOTSUPP;
return ethtool_get_any_eeprom(dev, useraddr, ops->get_eeprom,
@ -1052,7 +1053,8 @@ static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr)
u8 *data;
int ret = 0;
if (!ops->set_eeprom || !ops->get_eeprom_len)
if (!ops->set_eeprom || !ops->get_eeprom_len ||
!ops->get_eeprom_len(dev))
return -EOPNOTSUPP;
if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))