Fix hostapd operation without hw_mode driver data

Commit 7f0303d5b0bb425f3e7318a7016b55ba9e67f9de ('hostapd: Verify VHT
160/80+80 MHz driver support') added couple of hapd->iface->current_mode
dereferences of which the one in hostapd_set_freq() can be hit with some
configuration files when using driver wrappers that do not have hw_mode
data, i.e., when current_mode is NULL. This could result in segmentation
fault when trying to use driver=wired. Fix this by checking that
current_mode is not NULL before dereferencing it to get vht_capab.

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

diff --git a/src/ap/ap_drv_ops.c b/src/ap/ap_drv_ops.c
index cc4ac102ae6682535de57d56b2bea2ec96d0b4be..262fdcd94956eabe4bd5c65dea2db7ffa54c44ec 100644 (file)
--- a/src/ap/ap_drv_ops.c
+++ b/src/ap/ap_drv_ops.c
@@ -573,7 +573,8 @@ int hostapd_set_freq(struct hostapd_data *hapd, int mode, int freq,
                                    vht_enabled, sec_channel_offset,
                                    vht_oper_chwidth,
                                    center_segment0, center_segment1,
-                                   hapd->iface->current_mode->vht_capab))
+                                   hapd->iface->current_mode ?
+                                   hapd->iface->current_mode->vht_capab : 0))
                return -1;
 
        if (hapd->driver == NULL)