WPS: Fix active PBC session removal to ignore MAC address

Use only the UUID-E to remove active PBC session(s) at the completion of
successful PBC protocol run. This fixes potential issues with Enrollees
that use multiple MAC addresses and as such, can get multiple entries in
the PBC session list.

src/wps/wps_registrar.c

@@ -310,20 +310,25 @@ static void wps_registrar_add_pbc_session(struct wps_registrar *reg,
 
 
 static void wps_registrar_remove_pbc_session(struct wps_registrar *reg,
-					     const u8 *addr, const u8 *uuid_e)
+					     const u8 *uuid_e)
 {
-	struct wps_pbc_session *pbc, *prev = NULL;
+	struct wps_pbc_session *pbc, *prev = NULL, *tmp;
 
 	pbc = reg->pbc_sessions;
 	while (pbc) {
-		if (os_memcmp(pbc->addr, addr, ETH_ALEN) == 0 &&
-		    os_memcmp(pbc->uuid_e, uuid_e, WPS_UUID_LEN) == 0) {
+		if (os_memcmp(pbc->uuid_e, uuid_e, WPS_UUID_LEN) == 0) {
 			if (prev)
 				prev->next = pbc->next;
 			else
 				reg->pbc_sessions = pbc->next;
-			os_free(pbc);
-			break;
+			tmp = pbc;
+			pbc = pbc->next;
+			wpa_printf(MSG_DEBUG, "WPS: Removing PBC session for "
+				   "addr=" MACSTR, MAC2STR(tmp->addr));
+			wpa_hexdump(MSG_DEBUG, "WPS: Removed UUID-E",
+				    tmp->uuid_e, WPS_UUID_LEN);
+			os_free(tmp);
+			continue;
 		}
 		prev = pbc;
 		pbc = pbc->next;
@@ -2950,7 +2955,7 @@ static enum wps_process_res wps_process_wsc_done(struct wps_data *wps,
 
 	if (wps->pbc) {
 		wps_registrar_remove_pbc_session(wps->wps->registrar,
-						 wps->mac_addr_e, wps->uuid_e);
+						 wps->uuid_e);
 		wps_registrar_pbc_completed(wps->wps->registrar);
 	} else {
 		wps_registrar_pin_completed(wps->wps->registrar);