RSN: Update preauth scan results only based on new scan results

The fast-connect optimization to skip a new scan did not update how the
RSN preauthentication callback is used. There is no point in trying to
add preauthentication candidates from cases where scan was skipped, so
skip this call, too, in such cases.

Signed-hostap: Jouni Malinen <j@w1.fi>

wpa_supplicant/events.c

@@ -44,7 +44,8 @@
 #include "interworking.h"
 
 
-static int wpas_select_network_from_last_scan(struct wpa_supplicant *wpa_s);
+static int wpas_select_network_from_last_scan(struct wpa_supplicant *wpa_s,
+					      int new_scan);
 
 
 static int wpas_temp_disabled(struct wpa_supplicant *wpa_s,
@@ -1211,11 +1212,12 @@ static int _wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
 
 	wpa_scan_results_free(scan_res);
 
-	return wpas_select_network_from_last_scan(wpa_s);
+	return wpas_select_network_from_last_scan(wpa_s, 1);
 }
 
 
-static int wpas_select_network_from_last_scan(struct wpa_supplicant *wpa_s)
+static int wpas_select_network_from_last_scan(struct wpa_supplicant *wpa_s,
+					      int new_scan)
 {
 	struct wpa_bss *selected;
 	struct wpa_ssid *ssid = NULL;
@@ -1226,7 +1228,8 @@ static int wpas_select_network_from_last_scan(struct wpa_supplicant *wpa_s)
 		int skip;
 		skip = !wpa_supplicant_need_to_roam(wpa_s, selected, ssid);
 		if (skip) {
-			wpa_supplicant_rsn_preauth_scan_results(wpa_s);
+			if (new_scan)
+				wpa_supplicant_rsn_preauth_scan_results(wpa_s);
 			return 0;
 		}
 
@@ -1234,7 +1237,8 @@ static int wpas_select_network_from_last_scan(struct wpa_supplicant *wpa_s)
 			wpa_dbg(wpa_s, MSG_DEBUG, "Connect failed");
 			return -1;
 		}
-		wpa_supplicant_rsn_preauth_scan_results(wpa_s);
+		if (new_scan)
+			wpa_supplicant_rsn_preauth_scan_results(wpa_s);
 		/*
 		 * Do not notify other virtual radios of scan results since we do not
 		 * want them to start other associations at the same time.
@@ -1246,7 +1250,8 @@ static int wpas_select_network_from_last_scan(struct wpa_supplicant *wpa_s)
 		if (ssid) {
 			wpa_dbg(wpa_s, MSG_DEBUG, "Setup a new network");
 			wpa_supplicant_associate(wpa_s, NULL, ssid);
-			wpa_supplicant_rsn_preauth_scan_results(wpa_s);
+			if (new_scan)
+				wpa_supplicant_rsn_preauth_scan_results(wpa_s);
 		} else {
 			int timeout_sec = wpa_s->scan_interval;
 			int timeout_usec = 0;
@@ -1351,7 +1356,7 @@ int wpa_supplicant_fast_associate(struct wpa_supplicant *wpa_s)
 		return -1;
 	}
 
-	return wpas_select_network_from_last_scan(wpa_s);
+	return wpas_select_network_from_last_scan(wpa_s, 0);
 #endif /* CONFIG_NO_SCAN_PROCESSING */
 }