forked from luck/tmp_suning_uos_patched
ethtool: __ethtool_set_sg: check for function pointer before using it
__ethtool_set_sg does not check if dev->ethtool_ops->set_sg is defined which can result in a NULL pointer dereference when ethtool is used to change SG settings for drivers without SG support. Signed-off-by: Roger Luethi <rl@hellgate.ch> Reviewed-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1457,6 +1457,9 @@ static int __ethtool_set_sg(struct net_device *dev, u32 data)
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{
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int err;
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if (!dev->ethtool_ops->set_sg)
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return -EOPNOTSUPP;
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if (data && !(dev->features & NETIF_F_ALL_CSUM))
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return -EINVAL;
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