==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
BUG: KASAN: slab-use-after-free in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline]
BUG: KASAN: slab-use-after-free in __refcount_add include/linux/refcount.h:184 [inline]
BUG: KASAN: slab-use-after-free in __refcount_inc include/linux/refcount.h:241 [inline]
BUG: KASAN: slab-use-after-free in refcount_inc include/linux/refcount.h:258 [inline]
BUG: KASAN: slab-use-after-free in sock_hold include/net/sock.h:774 [inline]
BUG: KASAN: slab-use-after-free in sco_conn_del+0xb9/0x2d0 net/bluetooth/sco.c:199
Write of size 4 at addr ffff888012863080 by task syz-executor.1/11282

CPU: 1 PID: 11282 Comm: syz-executor.1 Not tainted 6.10.0-rc3-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 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
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189
 instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
 atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline]
 __refcount_add include/linux/refcount.h:184 [inline]
 __refcount_inc include/linux/refcount.h:241 [inline]
 refcount_inc include/linux/refcount.h:258 [inline]
 sock_hold include/net/sock.h:774 [inline]
 sco_conn_del+0xb9/0x2d0 net/bluetooth/sco.c:199
 sco_disconn_cfm+0x76/0xb0 net/bluetooth/sco.c:1374
 hci_disconn_cfm include/net/bluetooth/hci_core.h:1985 [inline]
 hci_conn_hash_flush+0x114/0x260 net/bluetooth/hci_conn.c:2584
 hci_dev_close_sync+0x534/0x11c0 net/bluetooth/hci_sync.c:5062
 hci_dev_do_close+0x2e/0x90 net/bluetooth/hci_core.c:556
 hci_unregister_dev+0x1e3/0x5f0 net/bluetooth/hci_core.c:2760
 vhci_release+0x7f/0x100 drivers/bluetooth/hci_vhci.c:666
 __fput+0x408/0xbb0 fs/file_table.c:422
 task_work_run+0x14e/0x250 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa9b/0x2ba0 kernel/exit.c:874
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1023
 __do_sys_exit_group kernel/exit.c:1034 [inline]
 __se_sys_exit_group kernel/exit.c:1032 [inline]
 __ia32_sys_exit_group+0x3e/0x50 kernel/exit.c:1032
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf72cc579
Code: Unable to access opcode bytes at 0xf72cc54f.
RSP: 002b:00000000fff56ffc EFLAGS: 00000286 ORIG_RAX: 00000000000000fc
RAX: ffffffffffffffda RBX: 0000000000000043 RCX: 00000000fff57048
RDX: 0000000000000000 RSI: 00000000f737334b RDI: 00000000f73119d6
RBP: 00000000f7422ff4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 9712:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:4122 [inline]
 kmalloc_node_track_caller_noprof+0x20f/0x440 mm/slub.c:4142
 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:597
 pskb_expand_head+0x236/0x1130 net/core/skbuff.c:2240
 netlink_trim+0x1ef/0x250 net/netlink/af_netlink.c:1317
 netlink_broadcast_filtered+0xc7/0xf10 net/netlink/af_netlink.c:1523
 nlmsg_multicast_filtered include/net/netlink.h:1125 [inline]
 nlmsg_multicast include/net/netlink.h:1144 [inline]
 nlmsg_notify+0x9e/0x220 net/netlink/af_netlink.c:2607
 rtnl_notify net/core/rtnetlink.c:757 [inline]
 rtmsg_ifinfo_send net/core/rtnetlink.c:4094 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:4110 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:4097 [inline]
 rtmsg_ifinfo+0x174/0x1a0 net/core/rtnetlink.c:4116
 dev_close_many+0x318/0x6a0 net/core/dev.c:1584
 unregister_netdevice_many_notify+0x46d/0x19f0 net/core/dev.c:11194
 unregister_netdevice_many net/core/dev.c:11277 [inline]
 unregister_netdevice_queue+0x307/0x3f0 net/core/dev.c:11156
 unregister_netdevice include/linux/netdevice.h:3119 [inline]
 __tun_detach+0x11ae/0x14c0 drivers/net/tun.c:685
 tun_detach drivers/net/tun.c:701 [inline]
 tun_chr_close+0xc8/0x250 drivers/net/tun.c:3500
 __fput+0x408/0xbb0 fs/file_table.c:422
 task_work_run+0x14e/0x250 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa9b/0x2ba0 kernel/exit.c:874
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1023
 __do_sys_exit_group kernel/exit.c:1034 [inline]
 __se_sys_exit_group kernel/exit.c:1032 [inline]
 __ia32_sys_exit_group+0x3e/0x50 kernel/exit.c:1032
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Freed by task 9712:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240
 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2196 [inline]
 slab_free mm/slub.c:4437 [inline]
 kfree+0x12a/0x3b0 mm/slub.c:4558
 skb_kfree_head net/core/skbuff.c:1069 [inline]
 skb_free_head+0x108/0x1d0 net/core/skbuff.c:1081
 skb_release_data+0x75c/0x980 net/core/skbuff.c:1108
 skb_release_all net/core/skbuff.c:1173 [inline]
 __kfree_skb net/core/skbuff.c:1187 [inline]
 consume_skb net/core/skbuff.c:1409 [inline]
 consume_skb+0xd0/0x170 net/core/skbuff.c:1403
 netlink_broadcast_filtered+0x3d5/0xf10 net/netlink/af_netlink.c:1546
 nlmsg_multicast_filtered include/net/netlink.h:1125 [inline]
 nlmsg_multicast include/net/netlink.h:1144 [inline]
 nlmsg_notify+0x9e/0x220 net/netlink/af_netlink.c:2607
 rtnl_notify net/core/rtnetlink.c:757 [inline]
 rtmsg_ifinfo_send net/core/rtnetlink.c:4094 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:4110 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:4097 [inline]
 rtmsg_ifinfo+0x174/0x1a0 net/core/rtnetlink.c:4116
 dev_close_many+0x318/0x6a0 net/core/dev.c:1584
 unregister_netdevice_many_notify+0x46d/0x19f0 net/core/dev.c:11194
 unregister_netdevice_many net/core/dev.c:11277 [inline]
 unregister_netdevice_queue+0x307/0x3f0 net/core/dev.c:11156
 unregister_netdevice include/linux/netdevice.h:3119 [inline]
 __tun_detach+0x11ae/0x14c0 drivers/net/tun.c:685
 tun_detach drivers/net/tun.c:701 [inline]
 tun_chr_close+0xc8/0x250 drivers/net/tun.c:3500
 __fput+0x408/0xbb0 fs/file_table.c:422
 task_work_run+0x14e/0x250 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa9b/0x2ba0 kernel/exit.c:874
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1023
 __do_sys_exit_group kernel/exit.c:1034 [inline]
 __se_sys_exit_group kernel/exit.c:1032 [inline]
 __ia32_sys_exit_group+0x3e/0x50 kernel/exit.c:1032
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

The buggy address belongs to the object at ffff888012863000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 128 bytes inside of
 freed 2048-byte region [ffff888012863000, ffff888012863800)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12860
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffefff(slab)
raw: 00fff00000000040 ffff888015442f00 ffffea000000e200 dead000000000002
raw: 0000000000000000 0000000000080008 00000001ffffefff 0000000000000000
head: 00fff00000000040 ffff888015442f00 ffffea000000e200 dead000000000002
head: 0000000000000000 0000000000080008 00000001ffffefff 0000000000000000
head: 00fff00000000003 ffffea00004a1801 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4688, tgid 4688 (klogd), ts 336981644525, free_ts 336954386258
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1468
 prep_new_page mm/page_alloc.c:1476 [inline]
 get_page_from_freelist+0x136a/0x2e50 mm/page_alloc.c:3420
 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4678
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 alloc_slab_page+0x56/0x110 mm/slub.c:2265
 allocate_slab mm/slub.c:2428 [inline]
 new_slab+0x84/0x260 mm/slub.c:2481
 ___slab_alloc+0xdac/0x1870 mm/slub.c:3667
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3757
 __slab_alloc_node mm/slub.c:3810 [inline]
 slab_alloc_node mm/slub.c:3989 [inline]
 kmalloc_trace_noprof+0x2c5/0x310 mm/slub.c:4148
 kmalloc_noprof include/linux/slab.h:660 [inline]
 syslog_print+0xf9/0x5d0 kernel/printk/printk.c:1553
 do_syslog+0x3be/0x6a0 kernel/printk/printk.c:1731
 __do_sys_syslog kernel/printk/printk.c:1823 [inline]
 __se_sys_syslog kernel/printk/printk.c:1821 [inline]
 __x64_sys_syslog+0x74/0xb0 kernel/printk/printk.c:1821
 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
page last free pid 10350 tgid 10350 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1088 [inline]
 free_unref_page+0x64a/0xe40 mm/page_alloc.c:2583
 __put_partials+0x14c/0x170 mm/slub.c:2995
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3941 [inline]
 slab_alloc_node mm/slub.c:4001 [inline]
 __do_kmalloc_node mm/slub.c:4121 [inline]
 __kmalloc_noprof+0x19d/0x420 mm/slub.c:4135
 kmalloc_noprof include/linux/slab.h:664 [inline]
 do_setlink+0x5f7/0x3ea0 net/core/rtnetlink.c:2847
 __rtnl_newlink+0xc3a/0x1960 net/core/rtnetlink.c:3696
 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3743
 rtnetlink_rcv_msg+0x3c7/0xea0 net/core/rtnetlink.c:6635
 netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2564
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x542/0x820 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1905
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 __sys_sendto+0x47f/0x4e0 net/socket.c:2192
 __do_compat_sys_socketcall+0x5e2/0x700 net/compat.c:475
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386

Memory state around the buggy address:
 ffff888012862f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888012863000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888012863080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888012863100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888012863180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================