WiFiUDP: fix crash when calling destinationIP with no packet available

Fixes #3989.
esp8266 · Dec 27, 2017 · f77a6c2 · f77a6c2
1 parent db1cfc7
commit f77a6c2
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/libraries/ESP8266WiFi/src/include/UdpContext.h b/libraries/ESP8266WiFi/src/include/UdpContext.h
@@ -163,6 +163,9 @@ class UdpContext
 
     uint32_t getDestAddress()
     {
+        if (!_rx_buf)
+            return 0;
+
         ip_hdr* iphdr = GET_IP_HDR(_rx_buf);
         return iphdr->dest.addr;
     }