==================================================================
BUG: KASAN: use-after-free in msg_word net/tipc/msg.h:207 [inline]
BUG: KASAN: use-after-free in msg_bits net/tipc/msg.h:217 [inline]
BUG: KASAN: use-after-free in msg_type net/tipc/msg.h:382 [inline]
BUG: KASAN: use-after-free in tipc_skb_dump+0x1282/0x1780 net/tipc/trace.c:97
Read of size 4 at addr ffff888111c0a8b4 by task syz.2.2098/5141

CPU: 0 PID: 5141 Comm: syz.2.2098 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x71/0x200 mm/kasan/report.c:316
 print_report+0x4a/0x60 mm/kasan/report.c:420
 kasan_report+0x122/0x150 mm/kasan/report.c:524
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:350
 msg_word net/tipc/msg.h:207 [inline]
 msg_bits net/tipc/msg.h:217 [inline]
 msg_type net/tipc/msg.h:382 [inline]
 tipc_skb_dump+0x1282/0x1780 net/tipc/trace.c:97
 tipc_list_dump+0x22b/0x2f0 net/tipc/trace.c:187
 tipc_sk_dump+0xa12/0xfb0 net/tipc/socket.c:4007
 do_trace_event_raw_event_tipc_sk_class net/tipc/trace.h:205 [inline]
 trace_event_raw_event_tipc_sk_class+0x250/0x470 net/tipc/trace.h:188
 trace_tipc_sk_overlimit1 net/tipc/trace.h:241 [inline]
 tipc_sk_enqueue net/tipc/socket.c:2457 [inline]
 tipc_sk_rcv+0x168a/0x2c20 net/tipc/socket.c:2499
 tipc_node_xmit+0x36f/0xd80 net/tipc/node.c:1703
 __tipc_sendmsg+0x1b1a/0x2860 net/tipc/socket.c:1515
 tipc_sendmsg+0x55/0x70 net/tipc/socket.c:1403
 sock_sendmsg_nosec net/socket.c:716 [inline]
 __sock_sendmsg net/socket.c:728 [inline]
 ____sys_sendmsg+0x5fb/0x9c0 net/socket.c:2509
 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2563
 __sys_sendmmsg+0x2cc/0x4e0 net/socket.c:2649
 __do_sys_sendmmsg net/socket.c:2678 [inline]
 __se_sys_sendmmsg net/socket.c:2675 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2675
 x64_sys_call+0x3f5/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:308
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f309999e559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f30983f7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f3099c26090 RCX: 00007f309999e559
RDX: 00000000040001b6 RSI: 0000200000001540 RDI: 0000000000000006
RBP: 00007f3099a358b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3099c26128 R14: 00007f3099c26090 R15: 00007ffeea0cbf78
 </TASK>

Allocated by task 5141:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:380 [inline]
 __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:938 [inline]
 __kmalloc_node_track_caller+0xb1/0x1e0 mm/slab_common.c:958
 kmalloc_reserve net/core/skbuff.c:449 [inline]
 __alloc_skb+0x226/0x4a0 net/core/skbuff.c:518
 alloc_skb_fclone include/linux/skbuff.h:1372 [inline]
 tipc_buf_acquire net/tipc/msg.c:72 [inline]
 tipc_msg_build+0xce/0xf60 net/tipc/msg.c:402
 __tipc_sendmsg+0x167c/0x2860 net/tipc/socket.c:1505
 tipc_sendmsg+0x55/0x70 net/tipc/socket.c:1403
 sock_sendmsg_nosec net/socket.c:716 [inline]
 __sock_sendmsg net/socket.c:728 [inline]
 ____sys_sendmsg+0x5fb/0x9c0 net/socket.c:2509
 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2563
 __sys_sendmmsg+0x2cc/0x4e0 net/socket.c:2649
 __do_sys_sendmmsg net/socket.c:2678 [inline]
 __se_sys_sendmmsg net/socket.c:2675 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2675
 x64_sys_call+0x3f5/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:308
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 5131:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:242
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250
 kasan_slab_free include/linux/kasan.h:178 [inline]
 slab_free_hook mm/slub.c:1750 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776
 slab_free mm/slub.c:3712 [inline]
 __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3728
 kfree+0x6f/0xf0 mm/slab_common.c:990
 skb_free_head net/core/skbuff.c:765 [inline]
 skb_release_data+0x63d/0x8a0 net/core/skbuff.c:794
 skb_release_all net/core/skbuff.c:859 [inline]
 __kfree_skb net/core/skbuff.c:873 [inline]
 kfree_skb_reason+0xd4/0x230 net/core/skbuff.c:896
 kfree_skb include/linux/skbuff.h:1271 [inline]
 tsk_advance_rx_queue+0x114/0x250 net/tipc/socket.c:281
 tipc_recvmsg+0x304/0x13a0 net/tipc/socket.c:1924
 ____sys_recvmsg+0x2d6/0x5c0 net/socket.c:-1
 ___sys_recvmsg+0x210/0x590 net/socket.c:2770
 do_recvmmsg+0x370/0x7e0 net/socket.c:2864
 __sys_recvmmsg net/socket.c:2943 [inline]
 __do_sys_recvmmsg net/socket.c:2966 [inline]
 __se_sys_recvmmsg net/socket.c:2959 [inline]
 __x64_sys_recvmmsg+0x195/0x250 net/socket.c:2959
 x64_sys_call+0x3e7/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:300
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Last potentially related work creation:
 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46
 __kasan_record_aux_stack+0xb6/0xc0 mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
 kvfree_call_rcu+0x8b/0x7a0 kernel/rcu/tree.c:3445
 drop_sysctl_table+0x2f5/0x430 fs/proc/proc_sysctl.c:1731
 unregister_sysctl_table+0x75/0x120 fs/proc/proc_sysctl.c:1769
 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:175
 neigh_sysctl_unregister+0x78/0x90 net/core/neighbour.c:3879
 addrconf_sysctl_unregister net/ipv6/addrconf.c:7251 [inline]
 addrconf_ifdown+0x168b/0x1950 net/ipv6/addrconf.c:3977
 addrconf_notify+0x39f/0xe30 net/ipv6/addrconf.c:-1
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xa1/0x110 kernel/notifier.c:455
 call_netdevice_notifiers_info net/core/dev.c:2022 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2060 [inline]
 call_netdevice_notifiers net/core/dev.c:2074 [inline]
 unregister_netdevice_many+0x104a/0x1910 net/core/dev.c:11005
 unregister_netdevice_queue+0x2e1/0x320 net/core/dev.c:10936
 unregister_netdevice include/linux/netdevice.h:3109 [inline]
 __tun_detach+0xc9d/0x1450 drivers/net/tun.c:685
 tun_detach drivers/net/tun.c:701 [inline]
 tun_chr_close+0x92/0x140 drivers/net/tun.c:3495
 __fput+0x1fd/0x8f0 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff888111c0a800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 180 bytes inside of
 1024-byte region [ffff888111c0a800, ffff888111c0ac00)

The buggy address belongs to the physical page:
page:ffffea0004470200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x111c08
head:ffffea0004470200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 ffffea00045e7c00 dead000000000002 ffff888100043080
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 289, tgid 289 (syz-executor), ts 24077394804, free_ts 23834100354
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2673
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2680
 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4587
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5931
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1967 [inline]
 new_slab+0x98/0x3e0 mm/slub.c:2020
 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177
 __slab_alloc+0x5e/0xa0 mm/slub.c:3263
 slab_alloc_node mm/slub.c:3348 [inline]
 __kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc+0xa4/0x1e0 mm/slab_common.c:951
 kmalloc include/linux/slab.h:568 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 __register_sysctl_table+0xd9/0xe50 fs/proc/proc_sysctl.c:1345
 register_net_sysctl+0x23f/0x250 net/sysctl_net.c:169
 neigh_sysctl_register+0x9a0/0xa80 net/core/neighbour.c:3860
 addrconf_sysctl_register+0xb3/0x1a0 net/ipv6/addrconf.c:7235
 ipv6_add_dev+0xbf5/0x1130 net/ipv6/addrconf.c:455
 ipv6_find_idev net/ipv6/addrconf.c:493 [inline]
 inet6_rtm_newaddr+0x4e2/0xa10 net/ipv6/addrconf.c:4980
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1581 [inline]
 free_pcp_prepare mm/page_alloc.c:1655 [inline]
 free_unref_page_prepare+0x81b/0x820 mm/page_alloc.c:3622
 free_unref_page+0x93/0x530 mm/page_alloc.c:3720
 free_the_page mm/page_alloc.c:863 [inline]
 __free_pages+0x67/0x100 mm/page_alloc.c:6021
 __free_slab+0xc7/0x1a0 mm/slub.c:2044
 free_slab mm/slub.c:2059 [inline]
 discard_slab mm/slub.c:2065 [inline]
 __unfreeze_partials+0x15a/0x190 mm/slub.c:2614
 put_cpu_partial+0xa9/0x100 mm/slub.c:2690
 __slab_free+0x1c4/0x280 mm/slub.c:3589
 do_slab_free mm/slub.c:3666 [inline]
 ___cache_free+0xbf/0xd0 mm/slub.c:3722
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0xc6/0x140 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x24/0x80 mm/kasan/common.c:311
 kasan_slab_alloc include/linux/kasan.h:202 [inline]
 slab_post_alloc_hook+0x4f/0x2d0 mm/slab.h:768
 slab_alloc_node mm/slub.c:3382 [inline]
 __kmem_cache_alloc_node+0x194/0x2d0 mm/slub.c:3423
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc+0xa4/0x1e0 mm/slab_common.c:951
 kmalloc include/linux/slab.h:568 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 fib_create_info+0x8a6/0x1fc0 net/ipv4/fib_semantics.c:1459
 fib_table_insert+0xaf/0x1de0 net/ipv4/fib_trie.c:1217

Memory state around the buggy address:
 ffff888111c0a780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888111c0a800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888111c0a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff888111c0a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888111c0a980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================