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net: remove ifalias on empty given alias

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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>
This commit is contained in:
Oliver Hartkopp 2008-09-23 21:23:19 -07:00 • committed by David S. Miller
parent d87798450a
commit 96ca4a2cc1
1 changed files with 8 additions and 0 deletions
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8
net/core/dev.c
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@ -967,6 +967,14 @@ int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
if (len >= IFALIASZ) if (len >= IFALIASZ)
return -EINVAL; return -EINVAL;
if (!len) {
if (dev->ifalias) {
kfree(dev->ifalias);
dev->ifalias = NULL;
}
return 0;
}
dev->ifalias = krealloc(dev->ifalias, len+1, GFP_KERNEL); dev->ifalias = krealloc(dev->ifalias, len+1, GFP_KERNEL);
if (!dev->ifalias) if (!dev->ifalias)
return -ENOMEM; return -ENOMEM;