diff --git a/iot_link/network/tcpip/lwip_socket/lwip-2.0.3/src/netif/ppp/eap.c b/iot_link/network/tcpip/lwip_socket/lwip-2.0.3/src/netif/ppp/eap.c
index 4134822fb..e26fe97df 100644
--- a/iot_link/network/tcpip/lwip_socket/lwip-2.0.3/src/netif/ppp/eap.c
+++ b/iot_link/network/tcpip/lwip_socket/lwip-2.0.3/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';
diff --git a/iot_link/os/novaos/components/lwip/lwip-2.1.2/src/netif/ppp/eap.c b/iot_link/os/novaos/components/lwip/lwip-2.1.2/src/netif/ppp/eap.c
index 5000e26b0..98e076225 100644
--- a/iot_link/os/novaos/components/lwip/lwip-2.1.2/src/netif/ppp/eap.c
+++ b/iot_link/os/novaos/components/lwip/lwip-2.1.2/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';