basic: Only add ematches to message if available

diff --git a/lib/route/cls/basic.c b/lib/route/cls/basic.c
index 835fd08c5dd69638029e490babffbca25dd42035..94f0cf7ed693c8a365428ebcf2803f47ba43dacc 100644 (file)
--- a/lib/route/cls/basic.c
+++ b/lib/route/cls/basic.c
@@ -121,7 +121,11 @@ static int basic_get_opts(struct rtnl_cls *cls, struct nl_msg *msg)
 
        NLA_PUT_U32(msg, TCA_BASIC_CLASSID, b->b_target);
 
-       return rtnl_ematch_fill_attr(msg, TCA_BASIC_EMATCHES, b->b_ematch);
+       if (b->b_mask & BASIC_ATTR_EMATCH &&
+           rtnl_ematch_fill_attr(msg, TCA_BASIC_EMATCHES, b->b_ematch) < 0)
+               goto nla_put_failure;
+       
+       return 0;
 
 nla_put_failure:
        return -NLE_NOMEM;