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[ovs-dev,V3,17/24] datapath: remove another BUG_ON()

Message ID 20200916173311.30956-18-gvrose8192@gmail.com
State New
Headers show
Series Add support for Linux kernels up to 5.8.x | expand

Commit Message

Gregory Rose Sept. 16, 2020, 5:33 p.m. UTC
From: Paolo Abeni <pabeni@redhat.com>

Upstream commit:
    commit 8a574f86652a4540a2433946ba826ccb87f398cc
    Author: Paolo Abeni <pabeni@redhat.com>
    Date:   Sun Dec 1 18:41:25 2019 +0100

    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.

    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>
    Signed-off-by: David S. Miller <davem@davemloft.net>

Cc: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Greg Rose <gvrose8192@gmail.com>
 datapath/datapath.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/datapath/datapath.c b/datapath/datapath.c
index 877c8bdba..deffb3a60 100644
--- a/datapath/datapath.c
+++ b/datapath/datapath.c
@@ -1414,7 +1414,10 @@  static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
-			BUG_ON(err < 0);
+			if (WARN_ON_ONCE(err < 0)) {
+				kfree_skb(reply);
+				goto out_free;
+			}
 			ovs_notify(&dp_flow_genl_family, &ovs_dp_flow_multicast_group, reply, info);
 		} else {
 			genl_set_err(&dp_flow_genl_family, sock_net(skb->sk), 0,
@@ -1423,6 +1426,7 @@  static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
 	ovs_flow_free(flow, true);
 	return 0;