From: Oliver Hartkopp <oliver@hartkopp.net>
Date: Wed, 24 Sep 2008 04:23:19 +0000 (-0700)
Subject: net: remove ifalias on empty given alias
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=96ca4a2cc1454cf633a1e0796b7ef39d937b87ec;p=openwrt%2Fstaging%2Fblogic.git

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>
---

diff --git a/net/core/dev.c b/net/core/dev.c
index e91390533999..a90737fe2472 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -967,6 +967,14 @@ int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
 	if (len >= IFALIASZ)
 		return -EINVAL;
 
+	if (!len) {
+		if (dev->ifalias) {
+			kfree(dev->ifalias);
+			dev->ifalias = NULL;
+		}
+		return 0;
+	}
+
 	dev->ifalias = krealloc(dev->ifalias, len+1, GFP_KERNEL);
 	if (!dev->ifalias)
 		return -ENOMEM;