Fix regression in LEAP

Commit 458cb3019108b6cb8c0c1cab94ae6ebf244eda27 broke LEAP since it
rejects EAP-Success packet that is used within LEAP and this frame does
not have a payload. Fix LEAP by relaxing the generic EAP packet
validation if LEAP has been negotiated.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>

src/eap_peer/eap.c

@@ -348,6 +348,7 @@ SM_STATE(EAP, METHOD)
 {
 	struct wpabuf *eapReqData;
 	struct eap_method_ret ret;
+	int min_len = 1;
 
 	SM_ENTRY(EAP, METHOD);
 	if (sm->m == NULL) {
@@ -356,7 +357,9 @@ SM_STATE(EAP, METHOD)
 	}
 
 	eapReqData = eapol_get_eapReqData(sm);
-	if (!eap_hdr_len_valid(eapReqData, 1))
+	if (sm->m->vendor == EAP_VENDOR_IETF && sm->m->method == EAP_TYPE_LEAP)
+		min_len = 0; /* LEAP uses EAP-Success without payload */
+	if (!eap_hdr_len_valid(eapReqData, min_len))
 		return;
 
 	/*