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ethtool: ensure channel counts are within bounds during SCHANNELS

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Add a sanity check to ensure that all requested channel sizes are within
bounds, which should reduce errors in driver implementation.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Keller, Jacob E 2016-02-08 16:05:04 -08:00 • committed by David S. Miller
parent d4ab428627
commit 8bf3686204
1 changed files with 11 additions and 2 deletions
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13
net/core/ethtool.c
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@ -1274,15 +1274,24 @@ static noinline_for_stack int ethtool_get_channels(struct net_device *dev,
static noinline_for_stack int ethtool_set_channels(struct net_device *dev, static noinline_for_stack int ethtool_set_channels(struct net_device *dev,
void __user *useraddr) void __user *useraddr)
{ {
struct ethtool_channels channels; struct ethtool_channels channels, max;
u32 max_rx_in_use = 0; u32 max_rx_in_use = 0;
if (!dev->ethtool_ops->set_channels) if (!dev->ethtool_ops->set_channels || !dev->ethtool_ops->get_channels)
return -EOPNOTSUPP; return -EOPNOTSUPP;
if (copy_from_user(&channels, useraddr, sizeof(channels))) if (copy_from_user(&channels, useraddr, sizeof(channels)))
return -EFAULT; return -EFAULT;
dev->ethtool_ops->get_channels(dev, &max);
/* ensure new counts are within the maximums */
if ((channels.rx_count > max.max_rx) ||
(channels.tx_count > max.max_tx) ||
(channels.combined_count > max.max_combined) ||
(channels.other_count > max.max_other))
return -EINVAL;
/* ensure the new Rx count fits within the configured Rx flow /* ensure the new Rx count fits within the configured Rx flow
* indirection table settings */ * indirection table settings */
if (netif_is_rxfh_configured(dev) && if (netif_is_rxfh_configured(dev) &&