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linux/net/bridge
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Roopa Prabhu ef9a5a62c6 bridge: check for null fdb->dst before notifying switchdev drivers 
current switchdev drivers dont seem to support offloading fdb
entries pointing to the bridge device which have fdb->dst
not set to any port. This patch adds a NULL fdb->dst check in
the switchdev notifier code.

This patch fixes the below NULL ptr dereference:
$bridge fdb add 00:02:00:00:00:33 dev br0 self

[   69.953374] BUG: unable to handle kernel NULL pointer dereference at
0000000000000008
[   69.954044] IP: br_switchdev_fdb_notify+0x29/0x80
[   69.954044] PGD 66527067
[   69.954044] P4D 66527067
[   69.954044] PUD 7899c067
[   69.954044] PMD 0
[   69.954044]
[   69.954044] Oops: 0000 [#1] SMP
[   69.954044] Modules linked in:
[   69.954044] CPU: 1 PID: 3074 Comm: bridge Not tainted 4.13.0-rc6+ #1
[   69.954044] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS rel-1.7.5.1-0-g8936dbb-20141113_115728-nilsson.home.kraxel.org
04/01/2014
[   69.954044] task: ffff88007b827140 task.stack: ffffc90001564000
[   69.954044] RIP: 0010:br_switchdev_fdb_notify+0x29/0x80
[   69.954044] RSP: 0018:ffffc90001567918 EFLAGS: 00010246
[   69.954044] RAX: 0000000000000000 RBX: ffff8800795e0880 RCX:
00000000000000c0
[   69.954044] RDX: ffffc90001567920 RSI: 000000000000001c RDI:
ffff8800795d0600
[   69.954044] RBP: ffffc90001567938 R08: ffff8800795d0600 R09:
0000000000000000
[   69.954044] R10: ffffc90001567a88 R11: ffff88007b849400 R12:
ffff8800795e0880
[   69.954044] R13: ffff8800795d0600 R14: ffffffff81ef8880 R15:
000000000000001c
[   69.954044] FS:  00007f93d3085700(0000) GS:ffff88007fd00000(0000)
knlGS:0000000000000000
[   69.954044] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   69.954044] CR2: 0000000000000008 CR3: 0000000066551000 CR4:
00000000000006e0
[   69.954044] Call Trace:
[   69.954044]  fdb_notify+0x3f/0xf0
[   69.954044]  __br_fdb_add.isra.12+0x1a7/0x370
[   69.954044]  br_fdb_add+0x178/0x280
[   69.954044]  rtnl_fdb_add+0x10a/0x200
[   69.954044]  rtnetlink_rcv_msg+0x1b4/0x240
[   69.954044]  ? skb_free_head+0x21/0x40
[   69.954044]  ? rtnl_calcit.isra.18+0xf0/0xf0
[   69.954044]  netlink_rcv_skb+0xed/0x120
[   69.954044]  rtnetlink_rcv+0x15/0x20
[   69.954044]  netlink_unicast+0x180/0x200
[   69.954044]  netlink_sendmsg+0x291/0x370
[   69.954044]  ___sys_sendmsg+0x180/0x2e0
[   69.954044]  ? filemap_map_pages+0x2db/0x370
[   69.954044]  ? do_wp_page+0x11d/0x420
[   69.954044]  ? __handle_mm_fault+0x794/0xd80
[   69.954044]  ? vma_link+0xcb/0xd0
[   69.954044]  __sys_sendmsg+0x4c/0x90
[   69.954044]  SyS_sendmsg+0x12/0x20
[   69.954044]  do_syscall_64+0x63/0xe0
[   69.954044]  entry_SYSCALL64_slow_path+0x25/0x25
[   69.954044] RIP: 0033:0x7f93d2bad690
[   69.954044] RSP: 002b:00007ffc7217a638 EFLAGS: 00000246 ORIG_RAX:
000000000000002e
[   69.954044] RAX: ffffffffffffffda RBX: 00007ffc72182eac RCX:
00007f93d2bad690
[   69.954044] RDX: 0000000000000000 RSI: 00007ffc7217a670 RDI:
0000000000000003
[   69.954044] RBP: 0000000059a1f7f8 R08: 0000000000000006 R09:
000000000000000a
[   69.954044] R10: 00007ffc7217a400 R11: 0000000000000246 R12:
00007ffc7217a670
[   69.954044] R13: 00007ffc72182a98 R14: 00000000006114c0 R15:
00007ffc72182aa0
[   69.954044] Code: 1f 00 66 66 66 66 90 55 48 89 e5 48 83 ec 20 f6 47
20 04 74 0a 83 fe 1c 74 09 83 fe 1d 74 2c c9 66 90 c3 48 8b 47 10 48 8d
55 e8 <48> 8b 70 08 0f b7 47 1e 48 83 c7 18 48 89 7d f0 bf 03 00 00 00
[   69.954044] RIP: br_switchdev_fdb_notify+0x29/0x80 RSP:
ffffc90001567918
[   69.954044] CR2: 0000000000000008
[   69.954044] ---[ end trace 03e9eec4a82c238b ]---

Fixes: 6b26b51b1d ("net: bridge: Add support for notifying devices about FDB add/del")
Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-08-28 16:14:00 -07:00
..
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 2017-07-06 14:02:22 +01:00
br.c net: bridge: Receive notification about successful FDB offload 2017-06-08 14:16:25 -04:00
br_device.c net: bridge: fix dest lookup when vlan proto doesn't match 2017-07-14 08:19:23 -07:00
br_fdb.c bridge: allow ext learned entries to change ports 2017-07-04 01:49:44 -07:00
br_forward.c bridge: add per-port broadcast flood flag 2017-04-27 16:34:29 -04:00
br_if.c bridge: Export VLAN filtering state 2017-05-26 15:18:44 -04:00
br_input.c net: bridge: fix dest lookup when vlan proto doesn't match 2017-07-14 08:19:23 -07:00
br_ioctl.c bridge: move to workqueue gc 2017-02-06 22:53:13 -05:00
br_mdb.c bridge: mdb: fix leak on complete_info ptr on fail path 2017-07-11 20:01:39 -07:00
br_multicast.c bridge: Export multicast enabled state 2017-05-26 15:18:44 -04:00
br_netfilter_hooks.c net: convert nf_bridge_info.use from atomic_t to refcount_t 2017-07-01 07:39:07 -07:00
br_netfilter_ipv6.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
br_netlink.c net: add netlink_ext_ack argument to rtnl_link_ops.slave_changelink 2017-06-26 23:13:22 -04:00
br_netlink_tunnel.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
br_nf_core.c
br_private.h net, bridge: convert net_bridge_vlan.refcnt from atomic_t to refcount_t 2017-07-04 22:35:16 +01:00
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: vlan dst_metadata hooks in ingress and egress paths 2017-02-03 15:21:22 -05:00
br_stp.c bridge: move to workqueue gc 2017-02-06 22:53:13 -05:00
br_stp_bpdu.c net: introduce __skb_put_[zero, data, u8] 2017-06-20 13:30:14 -04:00
br_stp_if.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-06-06 22:20:08 -04:00
br_stp_timer.c bridge: start hello_timer when enabling KERNEL_STP in br_stp_start 2017-05-21 13:33:28 -04:00
br_switchdev.c bridge: check for null fdb->dst before notifying switchdev drivers 2017-08-28 16:14:00 -07:00
br_sysfs_br.c net: bridge: constify attribute_group structures. 2017-06-29 15:48:52 -04:00
br_sysfs_if.c bridge: add per-port broadcast flood flag 2017-04-27 16:34:29 -04:00
br_vlan.c net, bridge: convert net_bridge_vlan.refcnt from atomic_t to refcount_t 2017-07-04 22:35:16 +01:00
br_vlan_tunnel.c bridge: vlan_tunnel: explicitly reset metadata attrs to NULL on failure 2017-02-17 13:33:41 -05:00
Kconfig
Makefile bridge: per vlan dst_metadata netlink support 2017-02-03 15:21:22 -05:00