net: remove ifalias on empty given alias
This patch removes the potentially allocated ifalias when the (new) given alias is empty. E.g. when setting echo "" > /sys/class/net/eth0/ifalias Signed-off-by: Oliver Hartkopp <oliver@hartkopp.net> Acked-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -967,6 +967,14 @@ int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
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if (len >= IFALIASZ)
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return -EINVAL;
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if (!len) {
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if (dev->ifalias) {
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kfree(dev->ifalias);
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dev->ifalias = NULL;
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}
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return 0;
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}
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dev->ifalias = krealloc(dev->ifalias, len+1, GFP_KERNEL);
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if (!dev->ifalias)
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return -ENOMEM;
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