diff --git a/Libraries/LwIP/src/netif/ppp/eap.c b/Libraries/LwIP/src/netif/ppp/eap.c
index 1010e28..38aa995 100755
--- a/Libraries/LwIP/src/netif/ppp/eap.c
+++ b/Libraries/LwIP/src/netif/ppp/eap.c
@@ -1417,7 +1417,7 @@ static void eap_request(ppp_pcb *pcb, u_char *inp, int id, int len) {
         }
 
         /* Not so likely to happen. */
-        if (vallen >= len + sizeof (rhostname)) {
+        if (len - vallen >= sizeof (rhostname)) {
             ppp_dbglog("EAP: trimming really long peer name down");
             MEMCPY(rhostname, inp + vallen, sizeof (rhostname) - 1);
             rhostname[sizeof (rhostname) - 1] = '\0';
@@ -1845,7 +1845,7 @@ static void eap_response(ppp_pcb *pcb, u_char *inp, int id, int len) {
         }
 
         /* Not so likely to happen. */
-        if (vallen >= len + sizeof (rhostname)) {
+        if (len - vallen >= sizeof (rhostname)) {
             ppp_dbglog("EAP: trimming really long peer name down");
             MEMCPY(rhostname, inp + vallen, sizeof (rhostname) - 1);
             rhostname[sizeof (rhostname) - 1] = '\0';