From e7d7dedcdb43bb30d9b700089685d56618a6a171 Mon Sep 17 00:00:00 2001
From: Jon Shallow <supjps-libcoap@jpshallow.com>
Date: Fri, 8 Sep 2023 16:51:09 +0100
Subject: [PATCH] coap_address.c: Check for NULL ptr in is_bcast()

---
 src/coap_address.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/coap_address.c b/src/coap_address.c
index 6b36423d9f..2dabb366d9 100644
--- a/src/coap_address.c
+++ b/src/coap_address.c
@@ -216,7 +216,7 @@ coap_is_bcast(const coap_address_t *a) {
     last_refresh = now;
     ife = ifa;
     while (ife && bcst_cnt < COAP_BCST_CNT) {
-      if (ife->ifa_addr->sa_family == AF_INET &&
+      if (ife->ifa_addr && ife->ifa_addr->sa_family == AF_INET &&
           ife->ifa_flags & IFF_BROADCAST) {
         b_ipv4[bcst_cnt].s_addr = ((struct sockaddr_in *)ife->ifa_broadaddr)->sin_addr.s_addr;
         bcst_cnt++;