Prevent ap_scan change during association

Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>

wpa_supplicant/wpa_supplicant.c

@@ -1712,6 +1712,16 @@ int wpa_supplicant_set_ap_scan(struct wpa_supplicant *wpa_s, int ap_scan)
 	if (ap_scan < 0 || ap_scan > 2)
 		return -1;
 
+#ifdef ANDROID
+	if (ap_scan == 2 && ap_scan != wpa_s->conf->ap_scan &&
+	    wpa_s->wpa_state >= WPA_ASSOCIATING &&
+	    wpa_s->wpa_state < WPA_COMPLETED) {
+		wpa_printf(MSG_ERROR, "ap_scan = %d (%d) rejected while "
+			   "associating", wpa_s->conf->ap_scan, ap_scan);
+		return 0;
+	}
+#endif /* ANDROID */
+
 	old_ap_scan = wpa_s->conf->ap_scan;
 	wpa_s->conf->ap_scan = ap_scan;