[PATCH 2/2] ifup: fix handling when ip env is not given

[Alexander Aring]

This patch handles the ip env to "" if no ip env is given. Otherwise
we get a NULL pointer derefence.

Signed-off-by: Alexander Aring <aar at pengutronix.de>
---
 net/ifup.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ifup.c b/net/ifup.c
index 17e1b2f..59df069 100644
--- a/net/ifup.c
+++ b/net/ifup.c
@@ -94,6 +94,9 @@ int ifup(const char *name, unsigned flags)
 		goto out;
 
 	ip = getenv("ip");
+	if (!ip)
+		ip = "";
+
 	if (!strcmp(ip, "dhcp")) {
 		ret = run_command("dhcp");
 		if (ret)
-- 
2.8.3