ACS: Check whether iface->current_mode is NULL before use

This line seemed to trigger SIGSEGV in some code coverage testing cases.
It is not exactly clear how that was possible, but just in case, check
that iface->current_mode is set before using it here.

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

diff --git a/src/ap/acs.c b/src/ap/acs.c
index 0ac05b52afdf7bc1490f4ec040cac963146c91ec..7ab310f75a557b1854ec80bc766ad6b0997b6dc8 100644 (file)
--- a/src/ap/acs.c
+++ b/src/ap/acs.c
@@ -917,7 +917,8 @@ acs_find_ideal_chan_mode(struct hostapd_iface *iface,
 
                /* If the AP is in the 5 GHz or 6 GHz band, lets prefer a less
                 * crowded primary channel if one was found in the segment */
-               if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A &&
+               if (iface->current_mode &&
+                   iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A &&
                    chan != best) {
                        wpa_printf(MSG_DEBUG,
                                   "ACS: promoting channel %d over %d (less interference %Lg/%Lg)",