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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 ffff8801c3e037a0 by task syz-executor2/14194

CPU: 0 PID: 14194 Comm: syz-executor2 Not tainted 4.14.0-rc7+ #161
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 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+0x755/0x890 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: 0033:0x452869
RSP: 002b:00007feb31bddbe8 EFLAGS: 00000212 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452869
RDX: 0000000000000000 RSI: 0000000020619000 RDI: 0000000000000017
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4508
R13: 00000000ffffffff R14: 00007feb31bde6d4 R15: 0000000000000000

Allocated by task 14194:
 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
 __do_kmalloc mm/slab.c:3726 [inline]
 __kmalloc+0x162/0x760 mm/slab.c:3735
 kmalloc_array include/linux/slab.h:613 [inline]
 kcalloc include/linux/slab.h:624 [inline]
 tipc_subseq_alloc net/tipc/name_table.c:141 [inline]
 tipc_nameseq_insert_publ net/tipc/name_table.c:271 [inline]
 tipc_nametbl_insert_publ+0x12bf/0x17c0 net/tipc/name_table.c:481
 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 13046:
 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
 load_elf_binary+0x2035/0x4d80 fs/binfmt_elf.c:1087
 search_binary_handler+0x142/0x6b0 fs/exec.c:1634
 exec_binprm fs/exec.c:1676 [inline]
 do_execveat_common.isra.31+0x1754/0x23b0 fs/exec.c:1798
 do_execve fs/exec.c:1843 [inline]
 SYSC_execve fs/exec.c:1924 [inline]
 SyS_execve+0x39/0x50 fs/exec.c:1919
 do_syscall_64+0x26c/0x8d0 arch/x86/entry/common.c:287
 return_from_SYSCALL_64+0x0/0x7a

The buggy address belongs to the object at ffff8801c3e03780
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes to the right of
 32-byte region [ffff8801c3e03780, ffff8801c3e037a0)
The buggy address belongs to the page:
page:ffffea00070f80c0 count:1 mapcount:0 mapping:ffff8801c3e03000 index:0xffff8801c3e03fc1
flags: 0x200000000000100(slab)
raw: 0200000000000100 ffff8801c3e03000 ffff8801c3e03fc1 000000010000003b
raw: ffffea00070c3b20 ffffea00076125e0 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c3e03680: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801c3e03700: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801c3e03780: 00 00 00 00 fc fc fc fc fb fb fb fb fc fc fc fc
                               ^
 ffff8801c3e03800: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801c3e03880: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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