netdev - [PATCH net 1/2] net_sched: reject unknown tcfa

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Date:   Tue, 28 Aug 2018 16:24:46 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     netdev@...r.kernel.org
Cc:     Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S. Miller" <davem@...emloft.net>,
        Davide Caratti <dcaratti@...hat.com>
Subject: [PATCH net 1/2] net_sched: reject unknown tcfa_action values

After the commit 802bfb19152c ("net/sched: user-space can't set
unknown tcfa_action values"), unknown tcfa_action values are
converted to TC_ACT_UNSPEC, but the common agreement is instead
rejecting such configurations.

This change also introduce an helper to simplify the destruction
of a single action, avoding code duplication.

Fixes: 802bfb19152c ("net/sched: user-space can't set unknown tcfa_action values")
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
---
 net/sched/act_api.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index db83dac1e7f4..8614f2c282e8 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -662,6 +662,13 @@ int tcf_action_destroy(struct tc_action *actions[], int bind)
 	return ret;
 }
 
+int tcf_action_destroy_one(struct tc_action *a, int bind)
+{
+	struct tc_action *actions[] = { a, NULL };
+
+	return tcf_action_destroy(actions, bind);
+}
+
 static int tcf_action_put(struct tc_action *p)
 {
 	return __tcf_action_put(p, false);
@@ -881,17 +888,16 @@ struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
 	if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN)) {
 		err = tcf_action_goto_chain_init(a, tp);
 		if (err) {
-			struct tc_action *actions[] = { a, NULL };
-
-			tcf_action_destroy(actions, bind);
 			NL_SET_ERR_MSG(extack, "Failed to init TC action chain");
+			tcf_action_destroy_one(a, bind);
 			return ERR_PTR(err);
 		}
 	}
 
 	if (!tcf_action_valid(a->tcfa_action)) {
 		NL_SET_ERR_MSG(extack, "invalid action value, using TC_ACT_UNSPEC instead");
-		a->tcfa_action = TC_ACT_UNSPEC;
+		tcf_action_destroy_one(a, bind);
+		return ERR_PTR(-EINVAL);
 	}
 
 	return a;
-- 
2.17.1