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 e913905..a90737f 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -967,6 +967,14 @@
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;