netdev - [PATCH net 2/2] openvswitch: remove another BUG

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Message-Id: <ce4855580a312e982f9394fee6762a31663bbf5e.1574769406.git.pabeni@redhat.com>
Date:   Tue, 26 Nov 2019 13:10:30 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Pravin B Shelar <pshelar@....org>
Subject: [PATCH net 2/2] openvswitch: remove another BUG_ON()

If we can't build the flow del notification, we can simply delete
the flow, no need to crash the kernel. Still keep a WARN_ON to
preserve debuggability.

Note: the BUG_ON() predates the Fixes tag, but this change
can be applied only after the mentioned commit.

Fixes: aed067783e50 ("openvswitch: Minimize ovs_flow_cmd_del critical section.")
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
---
 net/openvswitch/datapath.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index e94f675794f1..50656e807c8c 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -1346,7 +1346,8 @@ static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
 						     OVS_FLOW_CMD_DEL,
 						     ufid_flags);
 			rcu_read_unlock();
-			BUG_ON(err < 0);
+			if (WARN_ON_ONCE(err < 0))
+				goto out_free;
 
 			ovs_notify(&dp_flow_genl_family, reply, info);
 		} else {
@@ -1354,6 +1355,7 @@ static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
 		}
 	}
 
+out_free:
 	ovs_flow_free(flow, true);
 	return 0;
 unlock:
-- 
2.21.0