commit cfad788eb8f4bdaf91888562fff6c624b960f534
Author: Michael Braun <michael-dev@fami-braun.de>
Date:   Mon Mar 1 23:27:46 2021

    Fix use after free with hapd->time_adv
    
    When an interface is disabled, e.g. due to radar detected,
    hapd->time_adv is freed by hostapd_free_hapd_data, but later
    used by ieee802_11_build_ap_params calling hostapd_eid_time_adv.
    
    Thus hapd->time_adv needs to be cleared as well.
    
    Signed-off-by: Michael Braun <michael-dev@fami-braun.de>
    Fixes: 39b97072b2

diff --git a/src/ap/hostapd.c b/src/ap/hostapd.c
index e25717464..b4364277e 100644
--- a/src/ap/hostapd.c
+++ b/src/ap/hostapd.c
@@ -414,6 +414,7 @@ void hostapd_free_hapd_data(struct hostapd_data *hapd)
 	}
 
 	wpabuf_free(hapd->time_adv);
+	hapd->time_adv = NULL;
 
 #ifdef CONFIG_INTERWORKING
 	gas_serv_deinit(hapd);