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| author | Guenter Roeck <linux@roeck-us.net> | 2014-10-30 20:50:15 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-10-31 16:12:34 -0400 |
| commit | e0fb6fb6d52686134b2ece144060219591d4f8d3 (patch) | |
| tree | b7adfd022440c708a7654a47c9cb60e9f9e7dfbf /net | |
| parent | 1e19e084eae727654052339757ab7f1eaff58bad (diff) | |
| download | linux-e0fb6fb6d52686134b2ece144060219591d4f8d3.tar.gz linux-e0fb6fb6d52686134b2ece144060219591d4f8d3.tar.bz2 linux-e0fb6fb6d52686134b2ece144060219591d4f8d3.zip | |
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/ethtool.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/core/ethtool.c b/net/core/ethtool.c index 1600aa24d36b..06dfb293e5aa 100644 --- a/net/core/ethtool.c +++ b/net/core/ethtool.c @@ -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))) |