BUG: KASAN: slab-out-of-bounds in tipc_nametbl_lookup_dst_nodes+0x4a3/0x4b0 net/tipc/name_table.c:670
Read of size 4 at addr ffff8801d2f8f4d0 by task syzkaller249909/2985

CPU: 0 PID: 2985 Comm: syzkaller249909 Not tainted 4.14.0-rc4-next-20171009+ #33
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429
 tipc_nametbl_lookup_dst_nodes+0x4a3/0x4b0 net/tipc/name_table.c:670
 tipc_sendmcast+0x70b/0xe20 net/tipc/socket.c:767
 __tipc_sendmsg+0xf49/0x1590 net/tipc/socket.c:971
 __tipc_sendstream+0x8eb/0xc00 net/tipc/socket.c:1065
 tipc_sendstream+0x50/0x70 net/tipc/socket.c:1039
 tipc_send_packet+0x33/0x50 net/tipc/socket.c:1113
 sock_sendmsg_nosec net/socket.c:633 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:643
 ___sys_sendmsg+0x75b/0x8a0 net/socket.c:2049
 __sys_sendmsg+0xe5/0x210 net/socket.c:2083
 SYSC_sendmsg net/socket.c:2094 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2090
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x43fd59
RSP: 002b:00007ffce2ab4728 EFLAGS: 00000203 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd59
RDX: 0000000000000004 RSI: 00000000203bbfc8 RDI: 0000000000000003
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000203 R12: 00000000004016c0
R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 1:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3628
 kmalloc include/linux/slab.h:508 [inline]
 kmalloc_array include/linux/slab.h:626 [inline]
 kcalloc include/linux/slab.h:638 [inline]
 tipc_subseq_alloc net/tipc/name_table.c:141 [inline]
 tipc_nameseq_create+0xe8/0x540 net/tipc/name_table.c:152
 tipc_nametbl_insert_publ+0xf77/0x17c0 net/tipc/name_table.c:476
 tipc_nametbl_publish+0x2aa/0x4f0 net/tipc/name_table.c:701
 tipc_sk_publish net/tipc/socket.c:2201 [inline]
 tipc_bind+0x33a/0x700 net/tipc/socket.c:629
 kernel_bind+0x62/0x80 net/socket.c:3285
 tipc_create_listen_sock net/tipc/server.c:337 [inline]
 tipc_open_listening_sock net/tipc/server.c:395 [inline]
 tipc_server_start+0x3a1/0xb60 net/tipc/server.c:610
 tipc_topsrv_start+0x64f/0x890 net/tipc/subscr.c:382
 tipc_init_net+0x3cc/0x570 net/tipc/core.c:74
 ops_init+0x10a/0x570 net/core/net_namespace.c:118
 __register_pernet_operations net/core/net_namespace.c:879 [inline]
 register_pernet_operations+0x45e/0x980 net/core/net_namespace.c:953
 register_pernet_subsys+0x2a/0x40 net/core/net_namespace.c:995
 tipc_init+0x83/0x104 net/tipc/core.c:136
 do_one_initcall+0x9e/0x330 init/main.c:829
 do_initcall_level init/main.c:895 [inline]
 do_initcalls init/main.c:903 [inline]
 do_basic_setup init/main.c:921 [inline]
 kernel_init_freeable+0x469/0x521 init/main.c:1069
 kernel_init+0x13/0x172 init/main.c:996
 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801d2f8f4c0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
 32-byte region [ffff8801d2f8f4c0, ffff8801d2f8f4e0)
The buggy address belongs to the page:
page:ffffea00074be3c0 count:1 mapcount:0 mapping:ffff8801d2f8f000 index:0xffff8801d2f8ffc1
flags: 0x200000000000100(slab)
raw: 0200000000000100 ffff8801d2f8f000 ffff8801d2f8ffc1 000000010000003f
raw: ffffea000753d460 ffffea0007475d60 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d2f8f380: fb fb fb fb fc fc fc fc 04 fc fc fc fc fc fc fc
 ffff8801d2f8f400: 00 06 fc fc fc fc fc fc 00 00 00 fc fc fc fc fc
>ffff8801d2f8f480: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc
                                                 ^
 ffff8801d2f8f500: 00 00 00 00 fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801d2f8f580: fb fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
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