linux-kernel - [PATCH 4.4 86/92] openvswitch: drop unneeded BUG_ON() in ovs_flow_cmd_build

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Message-Id: <20191204174335.355653224@linuxfoundation.org>
Date:   Wed,  4 Dec 2019 18:50:26 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.4 86/92] openvswitch: drop unneeded BUG_ON() in ovs_flow_cmd_build_info()

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

[ Upstream commit 8ffeb03fbba3b599690b361467bfd2373e8c450f ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/openvswitch/datapath.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -904,7 +904,10 @@ 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, ufid_flags);
-	BUG_ON(retval < 0);
+	if (WARN_ON_ONCE(retval < 0)) {
+		kfree_skb(skb);
+		skb = ERR_PTR(retval);
+	}
 	return skb;
 }