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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 ffff8801c716eee0 by task syz-executor2/6565

CPU: 1 PID: 6565 Comm: syz-executor2 Not tainted 4.14.0-rc6+ #149
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_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+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:00007ffa8e42cbe8 EFLAGS: 00000212 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000758190 RCX: 0000000000452869
RDX: 0000000000000000 RSI: 0000000020316000 RDI: 0000000000000015
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a6f7ff R14: 00007ffa8e42d9c0 R15: 000000000000001c

Allocated by task 6545:
 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:3725 [inline]
 __kmalloc+0x162/0x760 mm/slab.c:3734
 kmalloc_array include/linux/slab.h:612 [inline]
 kcalloc include/linux/slab.h:623 [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 5125:
 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:3503 [inline]
 kfree+0xca/0x250 mm/slab.c:3820
 kvfree+0x36/0x60 mm/util.c:416
 kvm_page_track_free_memslot+0x6f/0xc0 arch/x86/kvm/page_track.c:32
 kvm_arch_free_memslot+0x15b/0x230 arch/x86/kvm/x86.c:8263
 kvm_free_memslot+0xb8/0x110 arch/x86/kvm/../../../virt/kvm/kvm_main.c:529
 kvm_free_memslots+0x9d/0xd0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:542
 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:730 [inline]
 kvm_put_kvm+0x916/0xdf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:748
 kvm_vm_release+0x42/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:759
 __fput+0x327/0x7e0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:112
 exit_task_work include/linux/task_work.h:21 [inline]
 do_exit+0x9b5/0x1ad0 kernel/exit.c:865
 do_group_exit+0x149/0x400 kernel/exit.c:968
 get_signal+0x73f/0x16d0 kernel/signal.c:2334
 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808
 exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath+0x42f/0x510 arch/x86/entry/common.c:266
 entry_SYSCALL_64_fastpath+0xbc/0xbe

The buggy address belongs to the object at ffff8801c716eec0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes to the right of
 32-byte region [ffff8801c716eec0, ffff8801c716eee0)
The buggy address belongs to the page:
page:ffffea00071c5b80 count:1 mapcount:0 mapping:ffff8801c716e000 index:0xffff8801c716efc1
flags: 0x200000000000100(slab)
raw: 0200000000000100 ffff8801c716e000 ffff8801c716efc1 000000010000003f
raw: ffffea00071dd5e0 ffffea00071cabe0 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c716ed80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801c716ee00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801c716ee80: fb fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
                                                       ^
 ffff8801c716ef00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801c716ef80: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
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