From b541ca2c5a3f3f399d6f2ec9da33c1be5a8d8c19 Mon Sep 17 00:00:00 2001
From: Thomas Graf <tgraf@suug.ch>
Date: Tue, 8 Nov 2005 09:39:17 -0800
Subject: [PATCH] [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>
---
net/sched/ematch.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/net/sched/ematch.c b/net/sched/ematch.c
index ebfe2e7d21bd..64b047c65568 100644
--- 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;
--
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