diff options
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/ethtool.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/net/core/ethtool.c b/net/core/ethtool.c index fff6314f4c5e..107b122c8969 100644 --- a/net/core/ethtool.c +++ b/net/core/ethtool.c @@ -1693,14 +1693,23 @@ static int ethtool_get_ringparam(struct net_device *dev, void __user *useraddr) static int ethtool_set_ringparam(struct net_device *dev, void __user *useraddr) { - struct ethtool_ringparam ringparam; + struct ethtool_ringparam ringparam, max = { .cmd = ETHTOOL_GRINGPARAM }; - if (!dev->ethtool_ops->set_ringparam) + if (!dev->ethtool_ops->set_ringparam || !dev->ethtool_ops->get_ringparam) return -EOPNOTSUPP; if (copy_from_user(&ringparam, useraddr, sizeof(ringparam))) return -EFAULT; + dev->ethtool_ops->get_ringparam(dev, &max); + + /* ensure new ring parameters are within the maximums */ + if (ringparam.rx_pending > max.rx_max_pending || + ringparam.rx_mini_pending > max.rx_mini_max_pending || + ringparam.rx_jumbo_pending > max.rx_jumbo_max_pending || + ringparam.tx_pending > max.tx_max_pending) + return -EINVAL; + return dev->ethtool_ops->set_ringparam(dev, &ringparam); } |