ACS: Fix memory leak if interface is disabled during scan

The survey data was not freed if hostapd interface got disabled during
an ACS scan.

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

src/ap/acs.c

@@ -260,7 +260,7 @@ static void acs_clean_chan_surveys(struct hostapd_channel_data *chan)
 }
 
 
-static void acs_cleanup(struct hostapd_iface *iface)
+void acs_cleanup(struct hostapd_iface *iface)
 {
 	int i;
 	struct hostapd_channel_data *chan;

src/ap/acs.h

@@ -13,6 +13,7 @@
 #ifdef CONFIG_ACS
 
 enum hostapd_chan_status acs_init(struct hostapd_iface *iface);
+void acs_cleanup(struct hostapd_iface *iface);
 
 #else /* CONFIG_ACS */
 
@@ -22,6 +23,10 @@ static inline enum hostapd_chan_status acs_init(struct hostapd_iface *iface)
 	return HOSTAPD_CHAN_INVALID;
 }
 
+static inline void acs_cleanup(struct hostapd_iface *iface)
+{
+}
+
 #endif /* CONFIG_ACS */
 
 #endif /* ACS_H */

src/ap/hostapd.c

@@ -46,6 +46,7 @@
 #include "neighbor_db.h"
 #include "rrm.h"
 #include "fils_hlp.h"
+#include "acs.h"
 
 
 static int hostapd_flush_old_stations(struct hostapd_data *hapd, u16 reason);
@@ -394,8 +395,11 @@ static void hostapd_cleanup_iface_partial(struct hostapd_iface *iface)
 	hostapd_stop_setup_timers(iface);
 #endif /* NEED_AP_MLME */
 #endif /* CONFIG_IEEE80211N */
+	if (iface->current_mode)
+		acs_cleanup(iface);
 	hostapd_free_hw_features(iface->hw_features, iface->num_hw_features);
 	iface->hw_features = NULL;
+	iface->current_mode = NULL;
 	os_free(iface->current_rates);
 	iface->current_rates = NULL;
 	os_free(iface->basic_rates);