Cancel delayed scheduled scan when wpa_supplicant cleans up

Because a delayed scheduled scan will access the members of struct
wpa_supplicant which is freed and this can result in a crash,
wpa_supplicant needs to cancel delayed scheduled scan during cleanups.

Signed-hostap: Chengyi Zhao <chengyix.zhao@gmail.com>

diff --git a/wpa_supplicant/scan.c b/wpa_supplicant/scan.c
index bdd6815..75548e2 100644 (file)
--- a/wpa_supplicant/scan.c
+++ b/wpa_supplicant/scan.c
@@ -1230,6 +1230,23 @@ void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
 
 
 /**
+ * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
+ * @wpa_s: Pointer to wpa_supplicant data
+ *
+ * This function is used to stop a delayed scheduled scan.
+ */
+void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
+{
+       if (!wpa_s->sched_scan_supported)
+               return;
+
+       wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
+       eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
+                            wpa_s, NULL);
+}
+
+
+/**
  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
  * @wpa_s: Pointer to wpa_supplicant data
  *

diff --git a/wpa_supplicant/scan.h b/wpa_supplicant/scan.h
index e892479..2144787 100644 (file)
--- a/wpa_supplicant/scan.h
+++ b/wpa_supplicant/scan.h
@@ -15,6 +15,7 @@ int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
                                      int sec, int usec);
 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s);
 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s);
+void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s);
 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s);
 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
                                    int scanning);

diff --git a/wpa_supplicant/wpa_supplicant.c b/wpa_supplicant/wpa_supplicant.c
index 5773013..5984060 100644 (file)
--- a/wpa_supplicant/wpa_supplicant.c
+++ b/wpa_supplicant/wpa_supplicant.c
@@ -421,6 +421,7 @@ static void wpa_supplicant_cleanup(struct wpa_supplicant *wpa_s)
 
        wpa_bss_deinit(wpa_s);
 
+       wpa_supplicant_cancel_delayed_sched_scan(wpa_s);
        wpa_supplicant_cancel_scan(wpa_s);
        wpa_supplicant_cancel_auth_timeout(wpa_s);
        eloop_cancel_timeout(wpa_supplicant_stop_countermeasures, wpa_s, NULL);