linux-kernel - [PATCH 3.16 130/148] openvswitch: drop unneeded BUG_ON() in ovs_flow_cmd_build

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Message-ID: <lsq.1581185941.769130492@decadent.org.uk>
Date:   Sat, 08 Feb 2020 18:21:09 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "David S. Miller" <davem@...emloft.net>,
        "Paolo Abeni" <pabeni@...hat.com>
Subject: [PATCH 3.16 130/148] openvswitch: drop unneeded BUG_ON() in
 ovs_flow_cmd_build_info()

3.16.82-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Paolo Abeni <pabeni@...hat.com>

commit 8ffeb03fbba3b599690b361467bfd2373e8c450f upstream.

All the callers of ovs_flow_cmd_build_info() already deal with
error return code correctly, so we can handle the error condition
in a more gracefull way. Still dump a warning to preserve
debuggability.

v1 -> v2:
 - clarify the commit message
 - clean the skb and report the error (DaveM)

Fixes: ccb1352e76cf ("net: Add Open vSwitch kernel components.")
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/openvswitch/datapath.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -788,7 +788,10 @@ static struct sk_buff *ovs_flow_cmd_buil
 	retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
 					info->snd_portid, info->snd_seq, 0,
 					cmd);
-	BUG_ON(retval < 0);
+	if (WARN_ON_ONCE(retval < 0)) {
+		kfree_skb(skb);
+		skb = ERR_PTR(retval);
+	}
 	return skb;
 }