stkutil: add one more sanity check

diff --git a/src/stkutil.c b/src/stkutil.c
index fab52a1..7299fb5 100644 (file)
--- a/src/stkutil.c
+++ b/src/stkutil.c
@@ -1646,7 +1646,7 @@ static gboolean parse_dataobj_network_access_name(
        while (len) {
                label_size = *data;
 
-               if (label_size > (len - 1))
+               if (label_size == 0 || label_size > (len - 1))
                        return FALSE;
 
                memcpy(decoded_apn + offset, data + 1, label_size);