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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>
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@ -1036,7 +1036,8 @@ static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
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{
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const struct ethtool_ops *ops = dev->ethtool_ops;
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if (!ops->get_eeprom || !ops->get_eeprom_len)
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if (!ops->get_eeprom || !ops->get_eeprom_len ||
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!ops->get_eeprom_len(dev))
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return -EOPNOTSUPP;
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return ethtool_get_any_eeprom(dev, useraddr, ops->get_eeprom,
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@ -1052,7 +1053,8 @@ static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr)
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u8 *data;
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int ret = 0;
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if (!ops->set_eeprom || !ops->get_eeprom_len)
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if (!ops->set_eeprom || !ops->get_eeprom_len ||
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!ops->get_eeprom_len(dev))
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return -EOPNOTSUPP;
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if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))
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