eap_proxy: Confirm eap_proxy initialization before reading SIM info

Trying to access the SIM card details without checking if the eap_proxy
layer has been initialized can results in a crash. Address this by
sending the request for the IMSI through eapol_supp_sm.c which can
verify that eap_proxy has been initialized.

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

src/eapol_supp/eapol_supp_sm.c

@@ -2051,3 +2051,15 @@ int eapol_sm_failed(struct eapol_sm *sm)
 		return 0;
 	return !sm->eapSuccess && sm->eapFail;
 }
+
+
+int eapol_sm_get_eap_proxy_imsi(struct eapol_sm *sm, char *imsi, size_t *len)
+{
+#ifdef CONFIG_EAP_PROXY
+	if (sm->eap_proxy == NULL)
+		return -1;
+	return eap_proxy_get_imsi(imsi, len);
+#else /* CONFIG_EAP_PROXY */
+	return -1;
+#endif /* CONFIG_EAP_PROXY */
+}

src/eapol_supp/eapol_supp_sm.h

@@ -292,6 +292,7 @@ const char * eapol_sm_get_method_name(struct eapol_sm *sm);
 void eapol_sm_set_ext_pw_ctx(struct eapol_sm *sm,
 			     struct ext_password_data *ext);
 int eapol_sm_failed(struct eapol_sm *sm);
+int eapol_sm_get_eap_proxy_imsi(struct eapol_sm *sm, char *imsi, size_t *len);
 #else /* IEEE8021X_EAPOL */
 static inline struct eapol_sm *eapol_sm_init(struct eapol_ctx *ctx)
 {

wpa_supplicant/wpa_supplicant.c

@@ -3064,7 +3064,8 @@ next_driver:
 #ifdef CONFIG_EAP_PROXY
 {
 	size_t len;
-	wpa_s->mnc_len = eap_proxy_get_imsi(wpa_s->imsi, &len);
+	wpa_s->mnc_len = eapol_sm_get_eap_proxy_imsi(wpa_s->eapol, wpa_s->imsi,
+						     &len);
 	if (wpa_s->mnc_len > 0) {
 		wpa_s->imsi[len] = '\0';
 		wpa_printf(MSG_DEBUG, "eap_proxy: IMSI %s (MNC length %d)",