syz-executor.5 (10736) used greatest stack depth: 23472 bytes left
XFS (loop5): Unmounting Filesystem
==================================================================
BUG: KASAN: slab-out-of-bounds in tipc_nametbl_lookup_dst_nodes+0x4ad/0x4c0 net/tipc/name_table.c:670
Read of size 4 at addr ffff8880ac309090 by task syz-executor.4/10825

CPU: 0 PID: 10825 Comm: syz-executor.4 Not tainted 4.14.307-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:251
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:350
 kasan_report mm/kasan/report.c:408 [inline]
 __asan_report_load4_noabort+0x68/0x70 mm/kasan/report.c:428
 tipc_nametbl_lookup_dst_nodes+0x4ad/0x4c0 net/tipc/name_table.c:670
 tipc_sendmcast+0x51a/0xac0 net/tipc/socket.c:768
 __tipc_sendmsg+0xbab/0xf90 net/tipc/socket.c:975
 tipc_sendmsg+0x4c/0x70 net/tipc/socket.c:923
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f4356d600f9
RSP: 002b:00007f43552d2168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f4356e7ff80 RCX: 00007f4356d600f9
RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000004
RBP: 00007f4356dbbae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffce20df54f R14: 00007f43552d2300 R15: 0000000000022000

Allocated by task 8031:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15a/0x400 mm/slab.c:3729
 tipc_nameseq_create+0x53/0x290 net/tipc/name_table.c:152
 tipc_nametbl_insert_publ+0xb37/0x14e0 net/tipc/name_table.c:476
 tipc_nametbl_publish+0x211/0x3f0 net/tipc/name_table.c:701
 tipc_sk_publish net/tipc/socket.c:2206 [inline]
 tipc_bind+0x2c4/0x600 net/tipc/socket.c:630
 tipc_create_listen_sock net/tipc/server.c:338 [inline]
 tipc_open_listening_sock net/tipc/server.c:396 [inline]
 tipc_server_start+0x31f/0x880 net/tipc/server.c:611
 tipc_topsrv_start net/tipc/subscr.c:382 [inline]
 tipc_topsrv_init_net+0x53b/0x730 net/tipc/subscr.c:397
 ops_init+0xaa/0x3e0 net/core/net_namespace.c:118
 setup_net+0x22f/0x530 net/core/net_namespace.c:298
 copy_net_ns+0x19b/0x440 net/core/net_namespace.c:422
 create_new_namespaces+0x375/0x720 kernel/nsproxy.c:107
 unshare_nsproxy_namespaces+0xa1/0x1d0 kernel/nsproxy.c:206
 SYSC_unshare kernel/fork.c:2413 [inline]
 SyS_unshare+0x308/0x7f0 kernel/fork.c:2363
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3

Freed by task 4635:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xc9/0x250 mm/slab.c:3815
 kernfs_fop_write+0x161/0x440 fs/kernfs/file.c:330
 __vfs_write+0xe4/0x630 fs/read_write.c:480
 vfs_write+0x17f/0x4d0 fs/read_write.c:544
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0xf2/0x210 fs/read_write.c:582
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3

The buggy address belongs to the object at ffff8880ac309080
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
 32-byte region [ffff8880ac309080, ffff8880ac3090a0)
The buggy address belongs to the page:
page:ffffea0002b0c240 count:1 mapcount:0 mapping:ffff8880ac309000 index:0xffff8880ac309fc1
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffff8880ac309000 ffff8880ac309fc1 0000000100000033
raw: ffffea0002bd9820 ffffea0002ba6e60 ffff88813fe741c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880ac308f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880ac309000: 05 fc fc fc fc fc fc fc 05 fc fc fc fc fc fc fc
>ffff8880ac309080: 00 00 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
                         ^
 ffff8880ac309100: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880ac309180: 05 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================