Fix segfault in hostapd_eid_ht_capabilities() with some drivers

This function is not really needed in case of drivers that build the
HT IEs internally. However, since this can get called if ieee80211n=1
is set in hostapd.conf, we better not segfault even if the driver
does not provide hw info (hapd->iface->current_mode == NULL).

diff --git a/src/ap/ieee802_11_ht.c b/src/ap/ieee802_11_ht.c
index b193ee0..7541b83 100644 (file)
--- a/src/ap/ieee802_11_ht.c
+++ b/src/ap/ieee802_11_ht.c
@@ -30,7 +30,7 @@ u8 * hostapd_eid_ht_capabilities(struct hostapd_data *hapd, u8 *eid)
        struct ieee80211_ht_capabilities *cap;
        u8 *pos = eid;
 
-       if (!hapd->iconf->ieee80211n)
+       if (!hapd->iconf->ieee80211n || !hapd->iface->current_mode)
                return eid;
 
        *pos++ = WLAN_EID_HT_CAP;