Do not start another connect work while one is pending

It was possible for the connect or sme-connect radio work to get
re-scheduled while an earlier request was still pending, e.g.,
select_network is issued at the moment a scan radio work is in progress
and the old scan results are recent enough for starting the connection.
This could result in unexpected attempt to re-associate immediately
after completing the first connection.

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

wpa_supplicant/sme.c

@@ -475,6 +475,11 @@ void sme_authenticate(struct wpa_supplicant *wpa_s,
 		return;
 	}
 
+	if (radio_work_pending(wpa_s, "sme-connect")) {
+		wpa_dbg(wpa_s, MSG_DEBUG, "SME: Reject sme_authenticate() call since pending work exist");
+		return;
+	}
+
 	cwork = os_zalloc(sizeof(*cwork));
 	if (cwork == NULL)
 		return;

wpa_supplicant/wpa_supplicant.c

@@ -1366,6 +1366,11 @@ void wpa_supplicant_associate(struct wpa_supplicant *wpa_s,
 		return;
 	}
 
+	if (radio_work_pending(wpa_s, "connect")) {
+		wpa_dbg(wpa_s, MSG_DEBUG, "Reject wpa_supplicant_associate() call since pending work exist");
+		return;
+	}
+
 	cwork = os_zalloc(sizeof(*cwork));
 	if (cwork == NULL)
 		return;
@@ -3237,6 +3242,20 @@ void radio_work_done(struct wpa_radio_work *work)
 }
 
 
+int radio_work_pending(struct wpa_supplicant *wpa_s, const char *type)
+{
+	struct wpa_radio_work *work;
+	struct wpa_radio *radio = wpa_s->radio;
+
+	dl_list_for_each(work, &radio->work, struct wpa_radio_work, list) {
+		if (work->wpa_s == wpa_s && os_strcmp(work->type, type) == 0)
+			return 1;
+	}
+
+	return 0;
+}
+
+
 static int wpas_init_driver(struct wpa_supplicant *wpa_s,
 			    struct wpa_interface *iface)
 {

wpa_supplicant/wpa_supplicant_i.h

@@ -308,6 +308,7 @@ void radio_work_done(struct wpa_radio_work *work);
 void radio_remove_works(struct wpa_supplicant *wpa_s,
 			const char *type, int remove_all);
 void radio_work_check_next(struct wpa_supplicant *wpa_s);
+int radio_work_pending(struct wpa_supplicant *wpa_s, const char *type);
 
 struct wpa_connect_work {
 	unsigned int sme:1;