netdev - [PATCH net] net/sched: avoid double free on matchall reoffload

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Message-Id: <20190508225607.26052-1-jakub.kicinski@netronome.com>
Date:   Wed,  8 May 2019 15:56:07 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, oss-drivers@...ronome.com,
        jiri@...nulli.us, xiyou.wangcong@...il.com,
        Pieter Jansen van Vuuren 
        <pieter.jansenvanvuuren@...ronome.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH net] net/sched: avoid double free on matchall reoffload

From: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@...ronome.com>

Avoid freeing cls_mall.rule twice when failing to setup flow_action
offload used in the hardware intermediate representation. This is
achieved by returning 0 when the setup fails but the skip software
flag has not been set.

Fixes: f00cbf196814 ("net/sched: use the hardware intermediate representation for matchall")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@...ronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
---
 net/sched/cls_matchall.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c
index 1e98a517fb0b..db42d97a2006 100644
--- a/net/sched/cls_matchall.c
+++ b/net/sched/cls_matchall.c
@@ -308,6 +308,7 @@ static int mall_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb,
 			NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action");
 			return err;
 		}
+		return 0;
 	}
 
 	err = cb(TC_SETUP_CLSMATCHALL, &cls_mall, cb_priv);
-- 
2.21.0