BUG: KASAN: slab-out-of-bounds in tipc_nametbl_lookup_dst_nodes+0x448/0x4b0 net/tipc/name_table.c:670
Read of size 4 at addr ffff8801ce7adc10 by task syzkaller223169/2989

CPU: 1 PID: 2989 Comm: syzkaller223169 Not tainted 4.14.0-rc2-next-20170928+ #31
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+0x448/0x4b0 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_sendmsg+0x50/0x70 net/tipc/socket.c:919
 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: 0033:0x43fdf9
RSP: 002b:00007ffc67ec7728 EFLAGS: 00000207 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdf9
RDX: 0000000000000000 RSI: 0000000020316000 RDI: 0000000000000004
RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000401760
R13: 00000000004017f0 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 2989:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 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
 SYSC_bind+0x1b4/0x3f0 net/socket.c:1476
 SyS_bind+0x24/0x30 net/socket.c:1462
 entry_SYSCALL_64_fastpath+0x1f/0xbe

Freed by task 1534:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3504 [inline]
 kfree+0xca/0x250 mm/slab.c:3821
 kobject_uevent_env+0x248/0xbc0 lib/kobject_uevent.c:541
 kobject_synth_uevent+0x514/0xad0 lib/kobject_uevent.c:205
 uevent_store+0x27/0x50 drivers/base/core.c:984
 dev_attr_store+0x5c/0x90 drivers/base/core.c:704
 sysfs_kf_write+0x107/0x160 fs/sysfs/file.c:141
 kernfs_fop_write+0x2bc/0x450 fs/kernfs/file.c:316
 __vfs_write+0xef/0x970 fs/read_write.c:479
 vfs_write+0x18f/0x510 fs/read_write.c:543
 SYSC_write fs/read_write.c:588 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:580
 entry_SYSCALL_64_fastpath+0x1f/0xbe

The buggy address belongs to the object at ffff8801ce7adc00
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
 32-byte region [ffff8801ce7adc00, ffff8801ce7adc20)
The buggy address belongs to the page:
page:ffffea000739eb40 count:1 mapcount:0 mapping:ffff8801ce7ad000 index:0xffff8801ce7adfc1
flags: 0x200000000000100(slab)
raw: 0200000000000100 ffff8801ce7ad000 ffff8801ce7adfc1 000000010000003f
raw: ffffea00073abce0 ffffea00073df8e0 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801ce7adb00: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc
 ffff8801ce7adb80: 00 00 00 fc fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801ce7adc00: 00 00 fc fc fc fc fc fc 00 00 00 00 fc fc fc fc
                         ^
 ffff8801ce7adc80: fb fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
 ffff8801ce7add00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================