[net,v2,2/2] openvswitch: remove another BUG_ON()
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Message ID 66e3531bb9e53b50bf9c58de6bd3a92a8c7ca79c.1575221237.git.pabeni@redhat.com
State Accepted
Delegated to: David Miller
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Series
  • openvswitch: remove a couple of BUG_ON()
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Commit Message

Paolo Abeni Dec. 1, 2019, 5:41 p.m. UTC
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.

v1 -> v2:
 - do not leak an skb on error

Fixes: aed067783e50 ("openvswitch: Minimize ovs_flow_cmd_del critical section.")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
 net/openvswitch/datapath.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Patch
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diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index 8cab3435d8da..1047e8043084 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -1372,7 +1372,10 @@  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)) {
+				kfree_skb(reply);
+				goto out_free;
+			}
 
 			ovs_notify(&dp_flow_genl_family, reply, info);
 		} else {
@@ -1380,6 +1383,7 @@  static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
 		}
 	}
 
+out_free:
 	ovs_flow_free(flow, true);
 	return 0;
 unlock: