tunnel: Fix bug where misconfiguration persists.

Previously, misconfiguring a tunnel port to use the exact same settings
would cause the corresponding netdev to never be destroyed. When
attempting to re-use the port as a different type, this would fail and
result in a discrepancy between reported port type and actual netdev in
use.

An example configuration that would previously give unexpected behaviour:

ovs-vsctl add-port br0 p0 -- set int p0 type=gre options:remote_ip=1.2.3.4
ovs-vsctl add-port br0 p1 -- set int p1 type=internal
ovs-vsctl set int p1 type=gre options:remote_ip=1.2.3.4
ovs-vsctl set int p1 type=internal

The final command would report in the ovs-vswitchd logs that it is
attempting to configure the port with the same gre settings as p0,
despite the command specifying the type as internal. Even after
deleting and re-adding the port, the message would reappear.

This patch fixes the bug by dereferencing the netdev in the failure
case of tnl_port_add__(), and ensures that the tnl_port structure is
freed in that case as well.

Bug #1198386.

Signed-off-by: Joe Stringer <joestringer@nicira.com>
Acked-by: Ryan Wilson <wryan@vmware.com>
Acked-by: Alex Wang <alexw@nicira.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/ofproto/tunnel.c b/ofproto/tunnel.c
index 202358b86..7f7693ebc 100644
--- a/ofproto/tunnel.c
+++ b/ofproto/tunnel.c
@@ -117,8 +117,9 @@ tnl_port_add__(const struct ofport_dpif *ofport, const struct netdev *netdev,
                       "port '%s' (%s)", tnl_port_get_name(tnl_port),
                       tnl_port_get_name(existing_port), ds_cstr(&ds));
             ds_destroy(&ds);
-            free(tnl_port);
         }
+        netdev_close(tnl_port->netdev);
+        free(tnl_port);
         return false;
     }