libiwinfo: fix segfaults in nl80211 hwmodelist and freqlist operations if called...

diff --git a/contrib/package/iwinfo/src/iwinfo_nl80211.c b/contrib/package/iwinfo/src/iwinfo_nl80211.c
index 5828ee98de4491ea24dc0ddecc98fb6a2682d22c..468ad9d70554aba19dff3d74a13db133ad6ef24c 100644 (file)
--- a/contrib/package/iwinfo/src/iwinfo_nl80211.c
+++ b/contrib/package/iwinfo/src/iwinfo_nl80211.c
@@ -1438,7 +1438,7 @@ int nl80211_get_freqlist(const char *ifname, char *buf, int *len)
        if( req )
        {
                res = nl80211_send(req);
-               if( res )
+               if( res && res->attr[NL80211_ATTR_WIPHY_BANDS] )
                {
                        nla_for_each_nested(band,
                                res->attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)
@@ -1537,7 +1537,7 @@ int nl80211_get_hwmodelist(const char *ifname, int *buf)
        if( req )
        {
                res = nl80211_send(req);
-               if( res )
+               if( res && res->attr[NL80211_ATTR_WIPHY_BANDS] )
                {
                        nla_for_each_nested(band,
                                res->attr[NL80211_ATTR_WIPHY_BANDS], bands_remain)