==================================================================
BUG: KASAN: use-after-free in __nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:47 [inline]
BUG: KASAN: use-after-free in nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:52 [inline]
BUG: KASAN: use-after-free in nf_ct_ecache_exist include/net/netfilter/nf_conntrack_ecache.h:42 [inline]
BUG: KASAN: use-after-free in nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:63 [inline]
BUG: KASAN: use-after-free in nf_confirm+0x575/0x5b0 net/netfilter/nf_conntrack_proto.c:154
BUG: KASAN: use-after-free in __nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:47 [inline]
BUG: KASAN: use-after-free in nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:52 [inline]
BUG: KASAN: use-after-free in nf_ct_ecache_exist include/net/netfilter/nf_conntrack_ecache.h:42 [inline]
BUG: KASAN: use-after-free in nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:63 [inline]
BUG: KASAN: use-after-free in nf_confirm+0x575/0x5b0 net/netfilter/nf_conntrack_proto.c:154
Read of size 1 at addr ffff88805aed6704 by task syz-executor.5/24694

CPU: 1 PID: 24694 Comm: syz-executor.5 Not tainted 5.18.0-syzkaller-03023-g7e062cda7d90 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313
 print_report mm/kasan/report.c:429 [inline]
 kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
 __nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:47 [inline]
 nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:52 [inline]
 nf_ct_ecache_exist include/net/netfilter/nf_conntrack_ecache.h:42 [inline]
 nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:63 [inline]
 nf_confirm+0x575/0x5b0 net/netfilter/nf_conntrack_proto.c:154
 ipv6_confirm+0x211/0x5f0 net/netfilter/nf_conntrack_proto.c:400
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xc5/0x1f0 net/netfilter/core.c:620
 nf_hook+0x3d4/0x680 include/linux/netfilter.h:262
 NF_HOOK_COND include/linux/netfilter.h:295 [inline]
 ip6_output+0x330/0x540 net/ipv6/ip6_output.c:227
 dst_output include/net/dst.h:451 [inline]
 ip6_local_out+0xaf/0x1a0 net/ipv6/output_core.c:161
 ip6_send_skb+0xb7/0x340 net/ipv6/ip6_output.c:1947
 udp_v6_send_skb+0x7b4/0x15e0 net/ipv6/udp.c:1259
 udpv6_sendmsg+0x1f9d/0x2c50 net/ipv6/udp.c:1551
 inet6_sendmsg+0x99/0xe0 net/ipv6/af_inet6.c:652
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:734
 rxrpc_send_data_packet+0x1762/0x1e30 net/rxrpc/output.c:451
 rxrpc_queue_packet net/rxrpc/sendmsg.c:258 [inline]
 rxrpc_send_data+0x15c2/0x2e70 net/rxrpc/sendmsg.c:437
 rxrpc_do_sendmsg+0xbfe/0x1350 net/rxrpc/sendmsg.c:750
 rxrpc_sendmsg+0x429/0x640 net/rxrpc/af_rxrpc.c:561
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:734
 ____sys_sendmsg+0x6eb/0x810 net/socket.c:2492
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2546
 __sys_sendmsg net/socket.c:2575 [inline]
 __do_sys_sendmsg net/socket.c:2584 [inline]
 __se_sys_sendmsg net/socket.c:2582 [inline]
 __x64_sys_sendmsg+0x132/0x220 net/socket.c:2582
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f91e9689109
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f91ea849168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f91e979bf60 RCX: 00007f91e9689109
RDX: 0000000000000000 RSI: 0000000020001640 RDI: 0000000000000004
RBP: 00007f91e96e308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffee726903f R14: 00007f91ea849300 R15: 0000000000022000
 </TASK>

Allocated by task 23736:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:436 [inline]
 ____kasan_kmalloc mm/kasan/common.c:515 [inline]
 ____kasan_kmalloc mm/kasan/common.c:474 [inline]
 __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524
 kmalloc_array_node include/linux/slab.h:683 [inline]
 kcalloc_node include/linux/slab.h:688 [inline]
 memcg_alloc_slab_cgroups+0x8b/0x140 mm/memcontrol.c:2810
 account_slab mm/slab.h:653 [inline]
 allocate_slab+0x2c9/0x3c0 mm/slub.c:1958
 new_slab mm/slub.c:2002 [inline]
 ___slab_alloc+0x985/0xd90 mm/slub.c:3002
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3089
 slab_alloc_node mm/slub.c:3180 [inline]
 slab_alloc mm/slub.c:3222 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3229 [inline]
 kmem_cache_alloc+0x360/0x3b0 mm/slub.c:3239
 anon_vma_alloc mm/rmap.c:92 [inline]
 __anon_vma_prepare+0x2d6/0x560 mm/rmap.c:200
 anon_vma_prepare include/linux/rmap.h:150 [inline]
 do_anonymous_page mm/memory.c:3824 [inline]
 handle_pte_fault mm/memory.c:4625 [inline]
 __handle_mm_fault+0x3c9f/0x4150 mm/memory.c:4763
 handle_mm_fault+0x1c8/0x790 mm/memory.c:4861
 do_user_addr_fault+0x489/0x11c0 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1484 [inline]
 exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1540
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:570

Freed by task 24694:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:45
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328
 kasan_slab_free include/linux/kasan.h:200 [inline]
 slab_free_hook mm/slub.c:1727 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1753
 slab_free mm/slub.c:3507 [inline]
 kfree+0xd6/0x4d0 mm/slub.c:4555
 nf_conntrack_free+0x100/0x630 net/netfilter/nf_conntrack_core.c:1680
 nf_ct_destroy+0x1be/0x320 net/netfilter/nf_conntrack_core.c:610
 nf_ct_put include/net/netfilter/nf_conntrack.h:184 [inline]
 nf_ct_put include/net/netfilter/nf_conntrack.h:181 [inline]
 __nf_ct_resolve_clash+0x624/0x785 net/netfilter/nf_conntrack_core.c:1013
 nf_ct_resolve_clash+0x14a/0xa23 net/netfilter/nf_conntrack_core.c:1136
 __nf_conntrack_confirm.cold+0x16/0x23e net/netfilter/nf_conntrack_core.c:1284
 nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:62 [inline]
 nf_confirm+0x4ce/0x5b0 net/netfilter/nf_conntrack_proto.c:154
 ipv6_confirm+0x211/0x5f0 net/netfilter/nf_conntrack_proto.c:400
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xc5/0x1f0 net/netfilter/core.c:620
 nf_hook+0x3d4/0x680 include/linux/netfilter.h:262
 NF_HOOK_COND include/linux/netfilter.h:295 [inline]
 ip6_output+0x330/0x540 net/ipv6/ip6_output.c:227
 dst_output include/net/dst.h:451 [inline]
 ip6_local_out+0xaf/0x1a0 net/ipv6/output_core.c:161
 ip6_send_skb+0xb7/0x340 net/ipv6/ip6_output.c:1947
 udp_v6_send_skb+0x7b4/0x15e0 net/ipv6/udp.c:1259
 udpv6_sendmsg+0x1f9d/0x2c50 net/ipv6/udp.c:1551
 inet6_sendmsg+0x99/0xe0 net/ipv6/af_inet6.c:652
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:734
 rxrpc_send_data_packet+0x1762/0x1e30 net/rxrpc/output.c:451
 rxrpc_queue_packet net/rxrpc/sendmsg.c:258 [inline]
 rxrpc_send_data+0x15c2/0x2e70 net/rxrpc/sendmsg.c:437
 rxrpc_do_sendmsg+0xbfe/0x1350 net/rxrpc/sendmsg.c:750
 rxrpc_sendmsg+0x429/0x640 net/rxrpc/af_rxrpc.c:561
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:734
 ____sys_sendmsg+0x6eb/0x810 net/socket.c:2492
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2546
 __sys_sendmsg net/socket.c:2575 [inline]
 __do_sys_sendmsg net/socket.c:2584 [inline]
 __se_sys_sendmsg net/socket.c:2582 [inline]
 __x64_sys_sendmsg+0x132/0x220 net/socket.c:2582
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

Last potentially related work creation:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348
 kvfree_call_rcu+0x74/0x990 kernel/rcu/tree.c:3647
 __hw_addr_flush+0x152/0x240 net/core/dev_addr_lists.c:490
 dev_addr_flush+0x1d/0x50 net/core/dev_addr_lists.c:535
 free_netdev+0x1f5/0x620 net/core/dev.c:10698
 netdev_run_todo+0xb18/0x10b0 net/core/dev.c:10352
 vti6_exit_batch_net+0x3a5/0x670 net/ipv6/ip6_vti.c:1191
 ops_exit_list+0x125/0x170 net/core/net_namespace.c:167
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594
 process_one_work+0x996/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302

Second to last potentially related work creation:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348
 call_rcu+0x99/0x790 kernel/rcu/tree.c:3126
 fl_free net/ipv6/ip6_flowlabel.c:123 [inline]
 ip6_fl_gc+0x316/0x480 net/ipv6/ip6_flowlabel.c:170
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1519 [inline]
 __run_timers.part.0+0x679/0xa80 kernel/time/timer.c:1790
 __run_timers kernel/time/timer.c:1768 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:571

The buggy address belongs to the object at ffff88805aed6700
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 4 bytes inside of
 128-byte region [ffff88805aed6700, ffff88805aed6780)

The buggy address belongs to the physical page:
page:ffffea00016bb580 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5aed6
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0002619980 dead000000000005 ffff888010c418c0
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 27462, tgid 27457 (syz-executor.0), ts 693661403817, free_ts 687288935623
 prep_new_page mm/page_alloc.c:2441 [inline]
 get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4182
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408
 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272
 alloc_slab_page mm/slub.c:1797 [inline]
 allocate_slab+0x26c/0x3c0 mm/slub.c:1942
 new_slab mm/slub.c:2002 [inline]
 ___slab_alloc+0x985/0xd90 mm/slub.c:3002
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3089
 slab_alloc_node mm/slub.c:3180 [inline]
 slab_alloc mm/slub.c:3222 [inline]
 kmem_cache_alloc_trace+0x310/0x3f0 mm/slub.c:3253
 kmalloc include/linux/slab.h:588 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 tipc_bcast_init+0x1c5/0x800 net/tipc/bcast.c:695
 tipc_init_net+0x57f/0x660 net/tipc/core.c:84
 ops_init+0xaf/0x470 net/core/net_namespace.c:134
 setup_net+0x5d1/0xc50 net/core/net_namespace.c:325
 copy_net_ns+0x318/0x760 net/core/net_namespace.c:471
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
 ksys_unshare+0x445/0x920 kernel/fork.c:3137
 __do_sys_unshare kernel/fork.c:3208 [inline]
 __se_sys_unshare kernel/fork.c:3206 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3206
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1356 [inline]
 free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406
 free_unref_page_prepare mm/page_alloc.c:3328 [inline]
 free_unref_page+0x19/0x6a0 mm/page_alloc.c:3423
 kasan_depopulate_vmalloc_pte+0x5c/0x70 mm/kasan/shadow.c:359
 apply_to_pte_range mm/memory.c:2547 [inline]
 apply_to_pmd_range mm/memory.c:2591 [inline]
 apply_to_pud_range mm/memory.c:2627 [inline]
 apply_to_p4d_range mm/memory.c:2663 [inline]
 __apply_to_page_range+0x686/0x1030 mm/memory.c:2697
 kasan_release_vmalloc+0xa7/0xc0 mm/kasan/shadow.c:469
 __purge_vmap_area_lazy+0x8f9/0x1c50 mm/vmalloc.c:1722
 drain_vmap_area_work+0x52/0xe0 mm/vmalloc.c:1751
 process_one_work+0x996/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302

Memory state around the buggy address:
 ffff88805aed6600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88805aed6680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805aed6700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88805aed6780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805aed6800: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
==================================================================