From a827fcad451996f1a7043b479d8c6162174b2038 Mon Sep 17 00:00:00 2001 From: Hans Dedecker Date: Mon, 3 Jul 2017 16:39:21 +0200 Subject: [PATCH] dhcpv4: avoid segfault when there's no IPv4 prefix Signed-off-by: Hans Dedecker --- src/dhcpv4.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/dhcpv4.c b/src/dhcpv4.c index c7ac058..b0a4603 100644 --- a/src/dhcpv4.c +++ b/src/dhcpv4.c @@ -95,7 +95,8 @@ int setup_dhcpv4_interface(struct interface *iface, bool enable) return -1; } - uint32_t mask = iface->addr4[0].prefix ? htonl(~((1 << (32 - iface->addr4[0].prefix)) - 1)) : 0; + uint32_t mask = iface->addr4 && iface->addr4[0].prefix ? + htonl(~((1 << (32 - iface->addr4[0].prefix)) - 1)) : 0xffffffff; /* Create a range if not specified */ if (!(iface->dhcpv4_start.s_addr & htonl(0xffff0000)) && -- 2.30.2