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BUG: KASAN: use-after-free in device_for_each_child+0x18f/0x1a0 drivers/base/core.c:3996
Read of size 8 at addr ffff88802681d308 by task kbnepd bnep0/6498

CPU: 3 UID: 0 PID: 6498 Comm: kbnepd bnep0 Not tainted 6.12.0-rc6-syzkaller-00099-g7758b206117d #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xc3/0x620 mm/kasan/report.c:488
 kasan_report+0xd9/0x110 mm/kasan/report.c:601
 device_for_each_child+0x18f/0x1a0 drivers/base/core.c:3996
 pm_runtime_set_memalloc_noio+0xf2/0x180 drivers/base/power/runtime.c:248
 netdev_unregister_kobject+0x1ed/0x270 net/core/net-sysfs.c:2109
 unregister_netdevice_many_notify+0x1055/0x1e50 net/core/dev.c:11441
 unregister_netdevice_many net/core/dev.c:11469 [inline]
 unregister_netdevice_queue+0x307/0x3f0 net/core/dev.c:11343
 unregister_netdevice include/linux/netdevice.h:3118 [inline]
 unregister_netdev+0x1c/0x30 net/core/dev.c:11487
 bnep_session+0x2210/0x2d60 net/bluetooth/bnep/core.c:525
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2681d
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 24, tgid 24 (ksoftirqd/2), ts 156270799148, free_ts 164437865146
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1545 [inline]
 get_page_from_freelist+0xf7d/0x2d10 mm/page_alloc.c:3457
 __alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4733
 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265
 alloc_slab_page mm/slub.c:2412 [inline]
 allocate_slab mm/slub.c:2578 [inline]
 new_slab+0x2c9/0x410 mm/slub.c:2631
 ___slab_alloc+0xdac/0x1880 mm/slub.c:3818
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3908
 __slab_alloc_node mm/slub.c:3961 [inline]
 slab_alloc_node mm/slub.c:4122 [inline]
 __do_kmalloc_node mm/slub.c:4263 [inline]
 __kmalloc_node_track_caller_noprof+0x355/0x430 mm/slub.c:4283
 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:609
 __alloc_skb+0x164/0x380 net/core/skbuff.c:678
 alloc_skb include/linux/skbuff.h:1322 [inline]
 synproxy_send_client_synack+0x1ad/0xcf0 net/netfilter/nf_synproxy_core.c:460
 nft_synproxy_eval_v4 net/netfilter/nft_synproxy.c:59 [inline]
 nft_synproxy_do_eval+0xa49/0xd60 net/netfilter/nft_synproxy.c:141
 expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]
 nft_do_chain+0x2e6/0x18f0 net/netfilter/nf_tables_core.c:288
 nft_do_chain_inet+0x18b/0x350 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_slow+0xbb/0x200 net/netfilter/core.c:626
 nf_hook.constprop.0+0x42e/0x750 include/linux/netfilter.h:269
page last free pid 5364 tgid 5364 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1108 [inline]
 free_unref_page+0x5f4/0xdc0 mm/page_alloc.c:2638
 __put_partials+0x14c/0x170 mm/slub.c:3145
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:247 [inline]
 slab_post_alloc_hook mm/slub.c:4085 [inline]
 slab_alloc_node mm/slub.c:4134 [inline]
 kmem_cache_alloc_noprof+0x121/0x2f0 mm/slub.c:4141
 anon_vma_chain_alloc mm/rmap.c:143 [inline]
 anon_vma_fork+0x200/0x620 mm/rmap.c:365
 dup_mmap kernel/fork.c:709 [inline]
 dup_mm kernel/fork.c:1675 [inline]
 copy_mm kernel/fork.c:1724 [inline]
 copy_process+0x8406/0x8cb0 kernel/fork.c:2374
 kernel_clone+0xfd/0x960 kernel/fork.c:2786
 __do_sys_clone+0xba/0x100 kernel/fork.c:2929
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88802681d200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88802681d280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88802681d300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                      ^
 ffff88802681d380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88802681d400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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