syzbot

 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
BUG: KASAN: slab-out-of-bounds in tipc_nametbl_lookup_dst_nodes+0x44c/0x4c0 net/tipc/name_table.c:670
RIP: 0033:0x7fd7bd0b90f9
Read of size 4 at addr ffff8880b32757d0 by task syz-executor.4/18352
RSP: 002b:00007fd7bb62b168 EFLAGS: 00000246

 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fd7bd1d8f80 RCX: 00007fd7bd0b90f9
RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000004
RBP: 00007fd7bb62b1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffcf3cc38ef R14: 00007fd7bb62b300 R15: 0000000000022000
CPU: 0 PID: 18352 Comm: syz-executor.4 Not tainted 4.14.307-syzkaller #0
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 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+0x44c/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: 0033:0x7f3178cb00f9
RSP: 002b:00007f3177222168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3178dcff80 RCX: 00007f3178cb00f9
RDX: 0000000000004040 RSI: 0000000020000300 RDI: 0000000000000005
RBP: 00007f3178d0bae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff2f3fc49f R14: 00007f3177222300 R15: 0000000000022000

CPU: 1 PID: 18351 Comm: syz-executor.1 Not tainted 4.14.307-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Allocated by task 8010:
Call Trace:
 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
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15a/0x400 mm/slab.c:3729
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold+0x10a/0x149 lib/fault-inject.c:149
 tipc_nameseq_create+0x53/0x290 net/tipc/name_table.c:152
 should_failslab+0xd6/0x130 mm/failslab.c:32
 tipc_nametbl_insert_publ+0xb37/0x14e0 net/tipc/name_table.c:476
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc_node mm/slab.c:3297 [inline]
 kmem_cache_alloc_node_trace+0x25a/0x400 mm/slab.c:3659
 tipc_nametbl_publish+0x211/0x3f0 net/tipc/name_table.c:701
 __do_kmalloc_node mm/slab.c:3681 [inline]
 __kmalloc_node_track_caller+0x38/0x70 mm/slab.c:3696
 tipc_sk_publish net/tipc/socket.c:2206 [inline]
 tipc_bind+0x2c4/0x600 net/tipc/socket.c:630
 __kmalloc_reserve net/core/skbuff.c:137 [inline]
 __alloc_skb+0x96/0x510 net/core/skbuff.c:205
 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
 alloc_skb_fclone include/linux/skbuff.h:1022 [inline]
 tipc_buf_acquire+0x28/0xf0 net/tipc/msg.c:66
 ops_init+0xaa/0x3e0 net/core/net_namespace.c:118
 tipc_msg_build+0xcf/0xec0 net/tipc/msg.c:260
 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
 __tipc_sendmsg+0x503/0xf90 net/tipc/socket.c:1009
 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
 tipc_sendmsg+0x4c/0x70 net/tipc/socket.c:923

Freed by task 6228:
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 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
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xc9/0x250 mm/slab.c:3815
 aa_free_task_context+0xda/0x130 security/apparmor/context.c:54
 apparmor_cred_free+0x34/0x70 security/apparmor/lsm.c:58
 security_cred_free+0x71/0xb0 security/security.c:1003
 put_cred_rcu+0xe3/0x300 kernel/cred.c:117
 __put_cred+0x1a1/0x210 kernel/cred.c:151
 put_cred include/linux/cred.h:274 [inline]
 SYSC_faccessat fs/open.c:444 [inline]
 SyS_faccessat+0x52a/0x680 fs/open.c:353
 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 ffff8880b32757c0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
 32-byte region [ffff8880b32757c0, ffff8880b32757e0)
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
The buggy address belongs to the page:
page:ffffea0002cc9d40 count:1 mapcount:0 mapping:ffff8880b3275000 index:0xffff8880b3275fc1
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffff8880b3275000 ffff8880b3275fc1 000000010000003c
raw: ffffea00026b5f20 ffffea00028c1460 ffff88813fe741c0 0000000000000000
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
page dumped because: kasan: bad access detected

 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
Memory state around the buggy address:
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
 ffff8880b3275680: 00 01 fc fc fc fc fc fc 00 01 fc fc fc fc fc fc
RIP: 0033:0x7fe1b5b120f9
 ffff8880b3275700: fb fb fb fb fc fc fc fc 00 01 fc fc fc fc fc fc
RSP: 002b:00007fe1b4084168 EFLAGS: 00000246
>ffff8880b3275780: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc
 ORIG_RAX: 000000000000002e
                                                 ^
RAX: ffffffffffffffda RBX: 00007fe1b5c31f80 RCX: 00007fe1b5b120f9
 ffff8880b3275800: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000004
 ffff8880b3275880: 00 01 fc fc fc fc fc fc 00 01 fc fc fc fc fc fc
RBP: 00007fe1b40841d0 R08: 0000000000000000 R09: 0000000000000000
==================================================================
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc0e31d6df R14: 00007fe1b4084300 R15: 0000000000022000