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BUG: KASAN: slab-out-of-bounds in tipc_nametbl_lookup_dst_nodes+0x448/0x4b0 net/tipc/name_table.c:700
Read of size 4 at addr ffff8801dad74450 by task syz-executor7/9893

CPU: 0 PID: 9893 Comm: syz-executor7 Not tainted 4.14.0-rc5-next-20171018+ #36
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:700
 tipc_sendmcast+0x794/0xe70 net/tipc/socket.c:791
 __tipc_sendmsg+0xebf/0x1b20 net/tipc/socket.c:1316
 tipc_sendmsg+0x50/0x70 net/tipc/socket.c:1250
 sock_sendmsg_nosec net/socket.c:632 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:642
 ___sys_sendmsg+0x755/0x890 net/socket.c:2048
 __sys_sendmsg+0xe5/0x210 net/socket.c:2082
 SYSC_sendmsg net/socket.c:2093 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2089
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x452869
RSP: 002b:00007f752eaeabe8 EFLAGS: 00000212 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452869
RDX: 0000000000000000 RSI: 0000000020316000 RDI: 0000000000000013
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f0068
R13: 00000000ffffffff R14: 00007f752eaeb6d4 R15: 0000000000000000

Allocated by task 7195:
 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:3614
 kmalloc include/linux/slab.h:502 [inline]
 kmalloc_array include/linux/slab.h:620 [inline]
 kcalloc include/linux/slab.h:632 [inline]
 tipc_subseq_alloc net/tipc/name_table.c:142 [inline]
 tipc_nameseq_create+0xe8/0x540 net/tipc/name_table.c:153
 tipc_nametbl_insert_publ+0xf77/0x17c0 net/tipc/name_table.c:477
 tipc_nametbl_publish+0x2aa/0x4f0 net/tipc/name_table.c:762
 tipc_net_start+0x26f/0x450 net/tipc/net.c:120
 tipc_nl_net_set+0x4cf/0x770 net/tipc/net.c:245
 __tipc_nl_compat_doit net/tipc/netlink_compat.c:316 [inline]
 tipc_nl_compat_doit+0x431/0x660 net/tipc/netlink_compat.c:335
 tipc_nl_compat_handle net/tipc/netlink_compat.c:1158 [inline]
 tipc_nl_compat_recv+0xbe8/0x18f0 net/tipc/netlink_compat.c:1201
 genl_family_rcv_msg+0x7b7/0xfb0 net/netlink/genetlink.c:598
 genl_rcv_msg+0xb2/0x140 net/netlink/genetlink.c:623
 netlink_rcv_skb+0x216/0x440 net/netlink/af_netlink.c:2409
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:634
 netlink_unicast_kernel net/netlink/af_netlink.c:1273 [inline]
 netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1299
 netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1862
 sock_sendmsg_nosec net/socket.c:632 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:642
 sock_write_iter+0x31a/0x5d0 net/socket.c:911
 call_write_iter include/linux/fs.h:1770 [inline]
 new_sync_write fs/read_write.c:468 [inline]
 __vfs_write+0x684/0x970 fs/read_write.c:481
 vfs_write+0x189/0x510 fs/read_write.c:543
 SYSC_write fs/read_write.c:588 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:580
 do_syscall_64+0x26c/0x8d0 arch/x86/entry/common.c:287
 return_from_SYSCALL_64+0x0/0x7a

Freed by task 4936:
 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:3492 [inline]
 kfree+0xca/0x250 mm/slab.c:3807
 kvm_destroy_vm_debugfs arch/x86/kvm/../../../virt/kvm/kvm_main.c:558 [inline]
 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:708 [inline]
 kvm_put_kvm+0x28e/0xde0 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:869
 do_group_exit+0x149/0x400 kernel/exit.c:972
 get_signal+0x73f/0x16d0 kernel/signal.c:2333
 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 ffff8801dad74440
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
 32-byte region [ffff8801dad74440, ffff8801dad74460)
The buggy address belongs to the page:
page:ffffea00076b5d00 count:1 mapcount:0 mapping:ffff8801dad74000 index:0xffff8801dad74fc1
flags: 0x200000000000100(slab)
raw: 0200000000000100 ffff8801dad74000 ffff8801dad74fc1 000000010000003f
raw: ffffea00076b60e0 ffffea00076b57a0 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801dad74300: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801dad74380: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801dad74400: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc
                                                 ^
 ffff8801dad74480: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801dad74500: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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