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BUG: KASAN: use-after-free in notifier_call_chain kernel/notifier.c:75 [inline]
BUG: KASAN: use-after-free in raw_notifier_call_chain+0x3e/0x170 kernel/notifier.c:455
Read of size 8 at addr ffff88807ae99ea8 by task syz-executor.0/20797

CPU: 1 PID: 20797 Comm: syz-executor.0 Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description+0x65/0x4b0 mm/kasan/report.c:317
 print_report+0x108/0x220 mm/kasan/report.c:433
 kasan_report+0xfb/0x130 mm/kasan/report.c:495
 notifier_call_chain kernel/notifier.c:75 [inline]
 raw_notifier_call_chain+0x3e/0x170 kernel/notifier.c:455
 call_netdevice_notifiers_info net/core/dev.c:1942 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]
 call_netdevice_notifiers net/core/dev.c:1997 [inline]
 netdev_wait_allrefs_any net/core/dev.c:10233 [inline]
 netdev_run_todo+0x8ce/0x1090 net/core/dev.c:10347
 tun_detach drivers/net/tun.c:704 [inline]
 tun_chr_close+0x11f/0x130 drivers/net/tun.c:3458
 __fput+0x3ba/0x880 fs/file_table.c:320
 task_work_run+0x146/0x1c0 kernel/task_work.c:177
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0x6b2/0x2280 kernel/exit.c:813
 do_group_exit+0x1fd/0x2b0 kernel/exit.c:943
 get_signal+0x1743/0x1810 kernel/signal.c:2858
 arch_do_signal_or_restart+0x8d/0x750 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop+0x74/0x160 kernel/entry/common.c:166
 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2a3c6b02d1
Code: Unable to access opcode bytes at 0x7f2a3c6b02a7.
RSP: 002b:00007f2a3d7560b0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007f2a3c7abf80 RCX: 00007f2a3c6b02d1
RDX: 00007f2a3d7560f0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f2a3c6e6580 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007ffc8e621c0f R14: 00007f2a3d756300 R15: 0000000000022000
 </TASK>

Allocated by task 3620:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:437 [inline]
 __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:470
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:727 [inline]
 slab_alloc_node mm/slub.c:3248 [inline]
 slab_alloc mm/slub.c:3256 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3263 [inline]
 kmem_cache_alloc+0x1a6/0x310 mm/slub.c:3273
 kmem_cache_zalloc include/linux/slab.h:723 [inline]
 net_alloc net/core/net_namespace.c:403 [inline]
 copy_net_ns+0x13c/0x5b0 net/core/net_namespace.c:458
 create_new_namespaces+0x4db/0x8e0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11e/0x180 kernel/nsproxy.c:226
 ksys_unshare+0x57f/0xb30 kernel/fork.c:3182
 __do_sys_unshare kernel/fork.c:3253 [inline]
 __se_sys_unshare kernel/fork.c:3251 [inline]
 __x64_sys_unshare+0x34/0x40 kernel/fork.c:3251
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348
 insert_work+0x54/0x3e0 kernel/workqueue.c:1358
 __queue_work+0xa31/0xce0 kernel/workqueue.c:1517
 call_timer_fn+0xf5/0x210 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1514 [inline]
 __run_timers+0x7a2/0x980 kernel/time/timer.c:1790
 __do_softirq+0x277/0x75b kernel/softirq.c:571

Second to last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348
 insert_work+0x54/0x3e0 kernel/workqueue.c:1358
 __queue_work+0xa31/0xce0 kernel/workqueue.c:1517
 call_timer_fn+0xf5/0x210 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1514 [inline]
 __run_timers+0x7a2/0x980 kernel/time/timer.c:1790
 __do_softirq+0x277/0x75b kernel/softirq.c:571

The buggy address belongs to the object at ffff88807ae99c40
 which belongs to the cache net_namespace of size 6976
The buggy address is located 616 bytes inside of
 6976-byte region [ffff88807ae99c40, ffff88807ae9b780)

The buggy address belongs to the physical page:
page:ffffea0001eba600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807ae99c40 pfn:0x7ae98
head:ffffea0001eba600 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001ea1400 dead000000000003 ffff8880121db500
raw: ffff88807ae99c40 0000000080040003 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 3619, tgid 3619 (syz-executor.5), ts 74535711421, free_ts 74534946991
 prep_new_page mm/page_alloc.c:2532 [inline]
 get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283
 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549
 alloc_slab_page+0x70/0xf0 mm/slub.c:1829
 allocate_slab+0x5e/0x520 mm/slub.c:1974
 new_slab mm/slub.c:2034 [inline]
 ___slab_alloc+0x42e/0xce0 mm/slub.c:3036
 __slab_alloc mm/slub.c:3123 [inline]
 slab_alloc_node mm/slub.c:3214 [inline]
 slab_alloc mm/slub.c:3256 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3263 [inline]
 kmem_cache_alloc+0x25d/0x310 mm/slub.c:3273
 kmem_cache_zalloc include/linux/slab.h:723 [inline]
 net_alloc net/core/net_namespace.c:403 [inline]
 copy_net_ns+0x13c/0x5b0 net/core/net_namespace.c:458
 create_new_namespaces+0x4db/0x8e0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11e/0x180 kernel/nsproxy.c:226
 ksys_unshare+0x57f/0xb30 kernel/fork.c:3182
 __do_sys_unshare kernel/fork.c:3253 [inline]
 __se_sys_unshare kernel/fork.c:3251 [inline]
 __x64_sys_unshare+0x34/0x40 kernel/fork.c:3251
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1449 [inline]
 free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499
 free_unref_page_prepare mm/page_alloc.c:3380 [inline]
 free_unref_page+0x7d/0x630 mm/page_alloc.c:3476
 free_large_kmalloc+0xeb/0x1a0 mm/slub.c:3578
 kfree+0x182/0x210 mm/slub.c:4563
 skb_free_head net/core/skbuff.c:760 [inline]
 skb_release_data+0x536/0x6d0 net/core/skbuff.c:789
 skb_release_all net/core/skbuff.c:854 [inline]
 __kfree_skb+0x56/0x1d0 net/core/skbuff.c:868
 netlink_recvmsg+0x5c1/0x10f0 net/netlink/af_netlink.c:1998
 ____sys_recvmsg+0x285/0x530
 ___sys_recvmsg net/socket.c:2743 [inline]
 __sys_recvmsg+0x294/0x390 net/socket.c:2773
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88807ae99d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807ae99e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807ae99e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88807ae99f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807ae99f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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