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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 ffff8801d676b0e0 by task syz-executor2/14123

CPU: 1 PID: 14123 Comm: syz-executor2 Not tainted 4.14.0-rc8+ #172
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: 0033:0x452879
RSP: 002b:00007f683f4d9be8 EFLAGS: 00000212 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452879
RDX: 0000000000000000 RSI: 0000000020619000 RDI: 0000000000000018
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3d70
R13: 00000000ffffffff R14: 00007f683f4da6d4 R15: 0000000000000000

Allocated by task 14123:
 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 12705:
 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
 selinux_cred_free+0x48/0x70 security/selinux/hooks.c:3806
 security_cred_free+0x48/0x80 security/security.c:994
 put_cred_rcu+0x106/0x400 kernel/cred.c:117
 __rcu_reclaim kernel/rcu/rcu.h:195 [inline]
 rcu_do_batch kernel/rcu/tree.c:2691 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2945 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2912 [inline]
 rcu_process_callbacks+0xd74/0x17b0 kernel/rcu/tree.c:2929
 __do_softirq+0x2d7/0xb85 kernel/softirq.c:284

The buggy address belongs to the object at ffff8801d676b0c0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes to the right of
 32-byte region [ffff8801d676b0c0, ffff8801d676b0e0)
The buggy address belongs to the page:
page:ffffea000759dac0 count:1 mapcount:0 mapping:ffff8801d676b000 index:0xffff8801d676bfc1
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801d676b000 ffff8801d676bfc1 000000010000003f
raw: ffffea000757a020 ffffea00075949a0 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d676af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801d676b000: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801d676b080: 05 fc fc fc fc fc fc fc 00 00 00 00 fc fc fc fc
                                                       ^
 ffff8801d676b100: 00 00 fc fc fc fc fc fc 00 00 fc fc fc fc fc fc
 ffff8801d676b180: 00 00 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
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