linux-kernel - [PATCH 4.17 029/101] net/sched: act_ife: preserve the action control in case of error

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Date:   Fri, 20 Jul 2018 14:13:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Davide Caratti <dcaratti@...hat.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.17 029/101] net/sched: act_ife: preserve the action control in case of error

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Davide Caratti <dcaratti@...hat.com>

[ Upstream commit cbf56c29624fa056a0c1c3d177e67aa51a7fd8d6 ]

in the following script

 # tc actions add action ife encode allow prio pass index 42
 # tc actions replace action ife encode allow tcindex drop index 42

the action control should remain equal to 'pass', if the kernel failed
to replace the TC action. Pospone the assignment of the action control,
to ensure it is not overwritten in the error path of tcf_ife_init().

Fixes: ef6980b6becb ("introduce IFE action")
Signed-off-by: Davide Caratti <dcaratti@...hat.com>
Acked-by: Cong Wang <xiyou.wangcong@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/sched/act_ife.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/net/sched/act_ife.c
+++ b/net/sched/act_ife.c
@@ -517,8 +517,6 @@ static int tcf_ife_init(struct net *net,
 			saddr = nla_data(tb[TCA_IFE_SMAC]);
 	}
 
-	ife->tcf_action = parm->action;
-
 	if (parm->flags & IFE_ENCODE) {
 		if (daddr)
 			ether_addr_copy(p->eth_dst, daddr);
@@ -575,6 +573,7 @@ metadata_parse_err:
 		}
 	}
 
+	ife->tcf_action = parm->action;
 	if (exists)
 		spin_unlock_bh(&ife->tcf_lock);