ieee802_11_mgmt: Handle frame info more consistently

Check for the fi parameter to be non-NULL before trying to fetch the
ssi_signal information similarly to how the fi->freq was already
handled. While the meta information is supposed to be available, it
looks like there is at least one corner case where fi == NULL could be
used (Authentication frame reprocessing after RADIUS-based ACL).

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

src/ap/ieee802_11.c

@@ -3829,6 +3829,7 @@ int ieee802_11_mgmt(struct hostapd_data *hapd, const u8 *buf, size_t len,
 	u16 fc, stype;
 	int ret = 0;
 	unsigned int freq;
+	int ssi_signal = fi ? fi->ssi_signal : 0;
 
 	if (len < 24)
 		return 0;
@@ -3864,7 +3865,7 @@ int ieee802_11_mgmt(struct hostapd_data *hapd, const u8 *buf, size_t len,
 
 
 	if (stype == WLAN_FC_STYPE_PROBE_REQ) {
-		handle_probe_req(hapd, mgmt, len, fi->ssi_signal);
+		handle_probe_req(hapd, mgmt, len, ssi_signal);
 		return 1;
 	}
 
@@ -3879,7 +3880,7 @@ int ieee802_11_mgmt(struct hostapd_data *hapd, const u8 *buf, size_t len,
 	}
 
 	if (hapd->iconf->track_sta_max_num)
-		sta_track_add(hapd->iface, mgmt->sa, fi->ssi_signal);
+		sta_track_add(hapd->iface, mgmt->sa, ssi_signal);
 
 	switch (stype) {
 	case WLAN_FC_STYPE_AUTH: