[ovs-git] [openvswitch/ovs] fc80f2: datapath: Fix net exit.

[GitHub]

  Branch: refs/heads/branch-2.1
  Home:   https://github.com/openvswitch/ovs
  Commit: fc80f21f0d216989337002bfa64b50e58fc05e60
      https://github.com/openvswitch/ovs/commit/fc80f21f0d216989337002bfa64b50e58fc05e60
  Author: Pravin B Shelar <pshelar at nicira.com>
  Date:   2015-02-20 (Fri, 20 Feb 2015)

  Changed paths:
    M datapath/datapath.c
    M datapath/vport.h

  Log Message:
  -----------
  datapath: Fix net exit.

Open vSwitch allows moving internal vport to different namespace
while still connected to the bridge. But when namespace deleted
OVS does not detach these vports, that results in dangling
pointer to netdevice which causes kernel panic as follows.
This issue is fixed by detaching all ovs ports from the deleted
namespace at net-exit.

BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
IP: [<ffffffffa0aadaa5>] ovs_vport_locate+0x35/0x80 [openvswitch]
Oops: 0000 [#1] SMP
Call Trace:
 [<ffffffffa0aa6391>] lookup_vport+0x21/0xd0 [openvswitch]
 [<ffffffffa0aa65f9>] ovs_vport_cmd_get+0x59/0xf0 [openvswitch]
 [<ffffffff8167e07c>] genl_family_rcv_msg+0x1bc/0x3e0
 [<ffffffff8167e319>] genl_rcv_msg+0x79/0xc0
 [<ffffffff8167d919>] netlink_rcv_skb+0xb9/0xe0
 [<ffffffff8167deac>] genl_rcv+0x2c/0x40
 [<ffffffff8167cffd>] netlink_unicast+0x12d/0x1c0
 [<ffffffff8167d3da>] netlink_sendmsg+0x34a/0x6b0
 [<ffffffff8162e140>] sock_sendmsg+0xa0/0xe0
 [<ffffffff8162e5e8>] ___sys_sendmsg+0x408/0x420
 [<ffffffff8162f541>] __sys_sendmsg+0x51/0x90
 [<ffffffff8162f592>] SyS_sendmsg+0x12/0x20
 [<ffffffff81764ee9>] system_call_fastpath+0x12/0x17

Reported-by: Assaf Muller <amuller at redhat.com>
Fixes: 46df7b81454("openvswitch: Add support for network namespaces.")
Signed-off-by: Pravin B Shelar <pshelar at nicira.com>
Reviewed-by: Thomas Graf <tgraf at noironetworks.com>
Signed-off-by: David S. Miller <davem at davemloft.net>

Upstream: 7b4577a9da ("openvswitch: Fix net exit").
Acked-by: Andy Zhou <azhou at nicira.com>