From 8bf3686204861d39803797ebbd1e264442421907 Mon Sep 17 00:00:00 2001 From: "Keller, Jacob E" Date: Mon, 8 Feb 2016 16:05:04 -0800 Subject: [PATCH] ethtool: ensure channel counts are within bounds during SCHANNELS 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 Signed-off-by: David S. Miller --- net/core/ethtool.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/net/core/ethtool.c b/net/core/ethtool.c index 379bdc59b1c8..65f907aea777 100644 --- a/net/core/ethtool.c +++ b/net/core/ethtool.c @@ -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, void __user *useraddr) { - struct ethtool_channels channels; + struct ethtool_channels channels, max; 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; if (copy_from_user(&channels, useraddr, sizeof(channels))) 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 * indirection table settings */ if (netif_is_rxfh_configured(dev) && -- 2.20.1