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309b66970e
linux/net/openvswitch
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Taehee Yoo 309b66970e net: openvswitch: do not free vport if register_netdevice() is failed. 
In order to create an internal vport, internal_dev_create() is used and
that calls register_netdevice() internally.
If register_netdevice() fails, it calls dev->priv_destructor() to free
private data of netdev. actually, a private data of this is a vport.

Hence internal_dev_create() should not free and use a vport after failure
of register_netdevice().

Test command
    ovs-dpctl add-dp bonding_masters

Splat looks like:
[ 1035.667767] kasan: GPF could be caused by NULL-ptr deref or user memory access
[ 1035.675958] general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI
[ 1035.676916] CPU: 1 PID: 1028 Comm: ovs-vswitchd Tainted: G    B             5.2.0-rc3+ #240
[ 1035.676916] RIP: 0010:internal_dev_create+0x2e5/0x4e0 [openvswitch]
[ 1035.676916] Code: 48 c1 ea 03 80 3c 02 00 0f 85 9f 01 00 00 4c 8b 23 48 b8 00 00 00 00 00 fc ff df 49 8d bc 24 60 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 86 01 00 00 49 8b bc 24 60 05 00 00 e8 e4 68 f4
[ 1035.713720] RSP: 0018:ffff88810dcb7578 EFLAGS: 00010206
[ 1035.713720] RAX: dffffc0000000000 RBX: ffff88810d13fe08 RCX: ffffffff84297704
[ 1035.713720] RDX: 00000000000000ac RSI: 0000000000000000 RDI: 0000000000000560
[ 1035.713720] RBP: 00000000ffffffef R08: fffffbfff0d3b881 R09: fffffbfff0d3b881
[ 1035.713720] R10: 0000000000000001 R11: fffffbfff0d3b880 R12: 0000000000000000
[ 1035.768776] R13: 0000607ee460b900 R14: ffff88810dcb7690 R15: ffff88810dcb7698
[ 1035.777709] FS:  00007f02095fc980(0000) GS:ffff88811b400000(0000) knlGS:0000000000000000
[ 1035.777709] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1035.777709] CR2: 00007ffdf01d2f28 CR3: 0000000108258000 CR4: 00000000001006e0
[ 1035.777709] Call Trace:
[ 1035.777709]  ovs_vport_add+0x267/0x4f0 [openvswitch]
[ 1035.777709]  new_vport+0x15/0x1e0 [openvswitch]
[ 1035.777709]  ovs_vport_cmd_new+0x567/0xd10 [openvswitch]
[ 1035.777709]  ? ovs_dp_cmd_dump+0x490/0x490 [openvswitch]
[ 1035.777709]  ? __kmalloc+0x131/0x2e0
[ 1035.777709]  ? genl_family_rcv_msg+0xa54/0x1030
[ 1035.777709]  genl_family_rcv_msg+0x63a/0x1030
[ 1035.777709]  ? genl_unregister_family+0x630/0x630
[ 1035.841681]  ? debug_show_all_locks+0x2d0/0x2d0
[ ... ]

Fixes: cf124db566 ("net: Fix inconsistent teardown and release of private netdev state.")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Reviewed-by: Greg Rose <gvrose8192@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-06-11 11:54:01 -07:00
..
actions.c net: openvswitch: Add a new action check_pkt_len 2019-03-27 13:53:23 -07:00
conntrack.c openvswitch: Replace removed NF_NAT_NEEDED with IS_ENABLED(CONFIG_NF_NAT) 2019-05-08 09:43:15 -07:00
conntrack.h openvswitch: Support conntrack zone limit 2018-05-25 16:45:19 -04:00
datapath.c net: openvswitch: return an error instead of doing BUG_ON() 2019-05-04 01:36:36 -04:00
datapath.h openvswitch: Support conntrack zone limit 2018-05-25 16:45:19 -04:00
dp_notify.c openvswitch: reliable interface indentification in port dumps 2017-11-05 21:49:17 +09:00
flow_netlink.c netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
flow_netlink.h openvswitch: convert to kvmalloc 2019-03-12 10:04:02 -07:00
flow_table.c openvswitch: convert to kvmalloc 2019-03-12 10:04:02 -07:00
flow_table.h openvswitch: convert to kvmalloc 2019-03-12 10:04:02 -07:00
flow.c openvswitch: Fix IPv6 later frags parsing 2019-01-04 13:00:02 -08:00
flow.h openvswitch: convert to kvmalloc 2019-03-12 10:04:02 -07:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile openvswitch: Add meter infrastructure 2017-11-13 10:37:07 +09:00
meter.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
meter.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
vport-geneve.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
vport-gre.c net: core: dev: Add extack argument to dev_change_flags() 2018-12-06 13:26:07 -08:00
vport-internal_dev.c net: openvswitch: do not free vport if register_netdevice() is failed. 2019-06-11 11:54:01 -07:00
vport-internal_dev.h
vport-netdev.c openvswitch: remove BUG_ON from get_dpdev 2018-11-08 17:14:59 -08:00
vport-netdev.h
vport-vxlan.c netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
vport.c netlink: make nla_nest_start() add NLA_F_NESTED flag 2019-04-27 17:03:44 -04:00
vport.h