DHCP: Take interface reference on Address Defend failure

As the astate could be freed on dropping the DHCP state.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/dhcp.c b/src/dhcp.c
index ccd39b99..b9757be0 100644
--- a/src/dhcp.c
+++ b/src/dhcp.c
@@ -2335,9 +2335,10 @@ dhcp_message_new(struct bootp **bootp,
 static void
 dhcp_arp_defend_failed(struct arp_state *astate)
 {
+	struct interface *ifp = astate->iface;
 
-	dhcp_drop(astate->iface, "EXPIRED");
-	dhcp_start1(astate->iface);
+	dhcp_drop(ifp, "EXPIRED");
+	dhcp_start1(ifp);
 }
 #endif