[PKT_SCHED]: Correctly handle empty ematch trees

Fixes an invalid memory reference when the basic classifier is used without any ematches but just actions. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
mariux64 · Nov 8, 2005 · b541ca2 · b541ca2
1 parent 18a0c23
commit b541ca2
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/net/sched/ematch.c b/net/sched/ematch.c
@@ -298,6 +298,11 @@ int tcf_em_tree_validate(struct tcf_proto *tp, struct rtattr *rta,
 	struct tcf_ematch_tree_hdr *tree_hdr;
 	struct tcf_ematch *em;
 
+	if (!rta) {
+		memset(tree, 0, sizeof(*tree));
+		return 0;
+	}
+
 	if (rtattr_parse_nested(tb, TCA_EMATCH_TREE_MAX, rta) < 0)
 		goto errout;