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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 ffff8801dadac510 by task syz-executor1/11699

CPU: 1 PID: 11699 Comm: syz-executor1 Not tainted 4.14.0-rc4+ #80
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: 0033:0x4520a9
RSP: 002b:00007f6488a68c08 EFLAGS: 00000216 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 00000000004520a9
RDX: 0000000000000000 RSI: 0000000020316000 RDI: 0000000000000005
RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004b73ea
R13: 00000000ffffffff R14: 0000000000000005 R15: 0000000020f47fd0

Allocated by task 8410:
 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:3627
 kmalloc include/linux/slab.h:493 [inline]
 kmalloc_array include/linux/slab.h:611 [inline]
 kcalloc include/linux/slab.h:623 [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_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+0x7b7/0xfc0 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/0xe70 net/netlink/af_netlink.c:1862
 sock_sendmsg_nosec net/socket.c:633 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:643
 sock_write_iter+0x320/0x5e0 net/socket.c:912
 call_write_iter include/linux/fs.h:1770 [inline]
 new_sync_write fs/read_write.c:468 [inline]
 __vfs_write+0x68a/0x970 fs/read_write.c:481
 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

Freed by task 5578:
 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
 sctp_endpoint_destroy net/sctp/endpointola.c:254 [inline]
 sctp_endpoint_put+0x93/0x280 net/sctp/endpointola.c:297
 sctp_endpoint_free+0x97/0xc0 net/sctp/endpointola.c:240
 sctp_destroy_sock+0xd6/0x4c0 net/sctp/socket.c:4493
 sk_common_release+0x6b/0x2f0 net/core/sock.c:2986
 sctp_close+0x45e/0x980 net/sctp/socket.c:1555
 inet_release+0xed/0x1c0 net/ipv4/af_inet.c:426
 sock_release+0x8d/0x1e0 net/socket.c:597
 SYSC_socketpair net/socket.c:1447 [inline]
 SyS_socketpair+0x4ae/0x640 net/socket.c:1353
 entry_SYSCALL_64_fastpath+0x1f/0xbe

The buggy address belongs to the object at ffff8801dadac500
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
 32-byte region [ffff8801dadac500, ffff8801dadac520)
The buggy address belongs to the page:
page:ffffea00076b6b00 count:1 mapcount:0 mapping:ffff8801dadac000 index:0xffff8801dadacfc1
flags: 0x200000000000100(slab)
raw: 0200000000000100 ffff8801dadac000 ffff8801dadacfc1 000000010000003d
raw: ffffea00075fb2a0 ffffea00073c6fa0 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801dadac400: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801dadac480: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801dadac500: 00 00 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
                         ^
 ffff8801dadac580: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801dadac600: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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