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linux/net/bridge
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Nikolay Aleksandrov 84aeb437ab net: bridge: fix early call to br_stp_change_bridge_id and plug newlink leaks 
The early call to br_stp_change_bridge_id in bridge's newlink can cause
a memory leak if an error occurs during the newlink because the fdb
entries are not cleaned up if a different lladdr was specified, also
another minor issue is that it generates fdb notifications with
ifindex = 0. Another unrelated memory leak is the bridge sysfs entries
which get added on NETDEV_REGISTER event, but are not cleaned up in the
newlink error path. To remove this special case the call to
br_stp_change_bridge_id is done after netdev register and we cleanup the
bridge on changelink error via br_dev_delete to plug all leaks.

This patch makes netlink bridge destruction on newlink error the same as
dellink and ioctl del which is necessary since at that point we have a
fully initialized bridge device.

To reproduce the issue:
$ ip l add br0 address 00:11:22:33:44:55 type bridge group_fwd_mask 1
RTNETLINK answers: Invalid argument

$ rmmod bridge
[ 1822.142525] =============================================================================
[ 1822.143640] BUG bridge_fdb_cache (Tainted: G           O    ): Objects remaining in bridge_fdb_cache on __kmem_cache_shutdown()
[ 1822.144821] -----------------------------------------------------------------------------

[ 1822.145990] Disabling lock debugging due to kernel taint
[ 1822.146732] INFO: Slab 0x0000000092a844b2 objects=32 used=2 fp=0x00000000fef011b0 flags=0x1ffff8000000100
[ 1822.147700] CPU: 2 PID: 13584 Comm: rmmod Tainted: G    B      O     4.15.0-rc2+ #87
[ 1822.148578] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[ 1822.150008] Call Trace:
[ 1822.150510]  dump_stack+0x78/0xa9
[ 1822.151156]  slab_err+0xb1/0xd3
[ 1822.151834]  ? __kmalloc+0x1bb/0x1ce
[ 1822.152546]  __kmem_cache_shutdown+0x151/0x28b
[ 1822.153395]  shutdown_cache+0x13/0x144
[ 1822.154126]  kmem_cache_destroy+0x1c0/0x1fb
[ 1822.154669]  SyS_delete_module+0x194/0x244
[ 1822.155199]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 1822.155773]  entry_SYSCALL_64_fastpath+0x23/0x9a
[ 1822.156343] RIP: 0033:0x7f929bd38b17
[ 1822.156859] RSP: 002b:00007ffd160e9a98 EFLAGS: 00000202 ORIG_RAX: 00000000000000b0
[ 1822.157728] RAX: ffffffffffffffda RBX: 00005578316ba090 RCX: 00007f929bd38b17
[ 1822.158422] RDX: 00007f929bd9ec60 RSI: 0000000000000800 RDI: 00005578316ba0f0
[ 1822.159114] RBP: 0000000000000003 R08: 00007f929bff5f20 R09: 00007ffd160e8a11
[ 1822.159808] R10: 00007ffd160e9860 R11: 0000000000000202 R12: 00007ffd160e8a80
[ 1822.160513] R13: 0000000000000000 R14: 0000000000000000 R15: 00005578316ba090
[ 1822.161278] INFO: Object 0x000000007645de29 @offset=0
[ 1822.161666] INFO: Object 0x00000000d5df2ab5 @offset=128

Fixes: 30313a3d57 ("bridge: Handle IFLA_ADDRESS correctly when creating bridge device")
Fixes: 5b8d5429da ("bridge: netlink: register netdevice before executing changelink")
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-12-18 13:29:01 -05:00
..
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2017-11-08 14:22:50 +09:00
br_arp_nd_proxy.c bridge: suppress nd pkts on BR_NEIGH_SUPPRESS ports 2017-10-08 21:12:04 -07:00
br_device.c net: Define eth_stp_addr in linux/etherdevice.h 2017-11-03 14:17:39 +09:00
br_fdb.c bridge: add tracepoint in br_fdb_update 2017-08-31 11:42:41 -07:00
br_forward.c bridge: add new BR_NEIGH_SUPPRESS port flag to suppress arp and nd flood 2017-10-08 21:12:04 -07:00
br_if.c net: bridge: add notifications for the bridge dev on vlan change 2017-11-02 15:53:40 +09:00
br_input.c net: bridge: Rename mglist to host_joined 2017-11-10 13:41:40 +09:00
br_ioctl.c net: bridge: add notifications for the bridge dev on vlan change 2017-11-02 15:53:40 +09:00
br_mdb.c net: bridge: Add/del switchdev object on host join/leave 2017-11-10 13:41:40 +09:00
br_multicast.c net: bridge: Send notification when host join/leaves a group 2017-11-10 13:41:40 +09:00
br_netfilter_hooks.c netfilter: convert hook list to an array 2017-08-28 17:44:00 +02:00
br_netfilter_ipv6.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
br_netlink_tunnel.c bridge: netlink: make setlink/dellink notifications more accurate 2017-10-29 11:03:43 +09:00
br_netlink.c net: bridge: fix early call to br_stp_change_bridge_id and plug newlink leaks 2017-12-18 13:29:01 -05:00
br_nf_core.c
br_private_stp.h net: bridge: add helper to set topology change 2016-12-10 21:27:23 -05:00
br_private_tunnel.h bridge: netlink: make setlink/dellink notifications more accurate 2017-10-29 11:03:43 +09:00
br_private.h net: bridge: Rename mglist to host_joined 2017-11-10 13:41:40 +09:00
br_stp_bpdu.c net: introduce __skb_put_[zero, data, u8] 2017-06-20 13:30:14 -04:00
br_stp_if.c net: bridge: add notifications for the bridge dev on vlan change 2017-11-02 15:53:40 +09:00
br_stp_timer.c net: bridge: Convert timers to use timer_setup() 2017-11-03 15:42:49 +09:00
br_stp.c net: bridge: add notifications for the bridge dev on vlan change 2017-11-02 15:53:40 +09:00
br_switchdev.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
br_sysfs_br.c net: bridge: constify attribute_group structures. 2017-06-29 15:48:52 -04:00
br_sysfs_if.c net: bridge: add notifications for the bridge dev on vlan change 2017-11-02 15:53:40 +09:00
br_vlan_tunnel.c bridge: vlan_tunnel: explicitly reset metadata attrs to NULL on failure 2017-02-17 13:33:41 -05:00
br_vlan.c bridge: vlan: signal if anything changed on vlan add 2017-10-29 11:03:43 +09:00
br.c net: bridge: add notifications for the bridge dev on vlan change 2017-11-02 15:53:40 +09:00
Kconfig
Makefile Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-11-04 09:26:51 +09:00