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BUG: KASAN: use-after-free in get_kprobe+0xa1/0xc0 kernel/kprobes.c:372
Read of size 8 at addr ffff888040bf5628 by task syz-executor.0/19910

CPU: 0 PID: 19910 Comm: syz-executor.0 Not tainted 5.10.123 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 print_address_description.constprop.0+0x1c/0x210 mm/kasan/report.c:385
 __kasan_report mm/kasan/report.c:545 [inline]
 kasan_report.cold+0x37/0x7c mm/kasan/report.c:562
 get_kprobe+0xa1/0xc0 kernel/kprobes.c:372
 __recover_optprobed_insn+0x31/0x220 arch/x86/kernel/kprobes/opt.c:44
 recover_probed_instruction+0x1c/0xf0 arch/x86/kernel/kprobes/core.c:275
 can_probe+0xc7/0x1b0 arch/x86/kernel/kprobes/core.c:303
 arch_prepare_kprobe+0x79/0x1b0 arch/x86/kernel/kprobes/core.c:499
 prepare_kprobe kernel/kprobes.c:1117 [inline]
 register_kprobe kernel/kprobes.c:1720 [inline]
 register_kprobe+0x9af/0x1330 kernel/kprobes.c:1682
 __register_trace_kprobe kernel/trace/trace_kprobe.c:514 [inline]
 __register_trace_kprobe+0x262/0x2d0 kernel/trace/trace_kprobe.c:482
 create_local_trace_kprobe+0x1e6/0x3b0 kernel/trace/trace_kprobe.c:1840
 perf_kprobe_init+0x18c/0x280 kernel/trace/trace_event_perf.c:272
 perf_kprobe_event_init+0xf8/0x1c0 kernel/events/core.c:9663
 perf_try_init_event+0x130/0x570 kernel/events/core.c:11044
 perf_init_event kernel/events/core.c:11096 [inline]
 perf_event_alloc.part.0+0xd96/0x2b30 kernel/events/core.c:11374
 perf_event_alloc kernel/events/core.c:11753 [inline]
 __do_sys_perf_event_open+0x57c/0x2cb0 kernel/events/core.c:11851
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fcfed21cb19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcfea771188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007fcfed330020 RCX: 00007fcfed21cb19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020001d80
RBP: 00007fcfed276f6d R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd50d275bf R14: 00007fcfea771300 R15: 0000000000022000

Allocated by task 19870:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461
 kmalloc include/linux/slab.h:552 [inline]
 kzalloc include/linux/slab.h:664 [inline]
 alloc_aggr_kprobe+0x41/0x190 kernel/kprobes.c:822
 try_to_optimize_kprobe kernel/kprobes.c:853 [inline]
 register_kprobe kernel/kprobes.c:1740 [inline]
 register_kprobe+0xb78/0x1330 kernel/kprobes.c:1682
 __register_trace_kprobe kernel/trace/trace_kprobe.c:514 [inline]
 __register_trace_kprobe+0x262/0x2d0 kernel/trace/trace_kprobe.c:482
 create_local_trace_kprobe+0x1e6/0x3b0 kernel/trace/trace_kprobe.c:1840
 perf_kprobe_init+0x18c/0x280 kernel/trace/trace_event_perf.c:272
 perf_kprobe_event_init+0xf8/0x1c0 kernel/events/core.c:9663
 perf_try_init_event+0x130/0x570 kernel/events/core.c:11044
 perf_init_event kernel/events/core.c:11096 [inline]
 perf_event_alloc.part.0+0xd96/0x2b30 kernel/events/core.c:11374
 perf_event_alloc kernel/events/core.c:11753 [inline]
 __do_sys_perf_event_open+0x57c/0x2cb0 kernel/events/core.c:11851
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 19062:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56
 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355
 __kasan_slab_free+0x110/0x150 mm/kasan/common.c:422
 slab_free_hook mm/slub.c:1542 [inline]
 slab_free_freelist_hook+0xa9/0x180 mm/slub.c:1576
 slab_free mm/slub.c:3149 [inline]
 kfree+0xd7/0x380 mm/slub.c:4125
 free_aggr_kprobe kernel/kprobes.c:434 [inline]
 do_free_cleaned_kprobes kernel/kprobes.c:586 [inline]
 kprobe_optimizer+0x56f/0x7e0 kernel/kprobes.c:624
 process_one_work+0x9a9/0x1590 kernel/workqueue.c:2279
 worker_thread+0x61d/0x1310 kernel/workqueue.c:2425
 kthread+0x38f/0x470 kernel/kthread.c:313
 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:296

Last call_rcu():
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_record_aux_stack+0x9e/0xb0 mm/kasan/generic.c:346
 __call_rcu kernel/rcu/tree.c:2967 [inline]
 call_rcu+0x8a/0xa00 kernel/rcu/tree.c:3041
 neigh_parms_release net/core/neighbour.c:1675 [inline]
 neigh_parms_release+0x178/0x1d0 net/core/neighbour.c:1665
 addrconf_ifdown.isra.0+0x1269/0x15e0 net/ipv6/addrconf.c:3885
 addrconf_notify+0x159/0x2350 net/ipv6/addrconf.c:3655
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0xb3/0x110 kernel/notifier.c:410
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2047
 call_netdevice_notifiers_extack net/core/dev.c:2059 [inline]
 call_netdevice_notifiers net/core/dev.c:2073 [inline]
 rollback_registered_many+0x83d/0x1280 net/core/dev.c:9562
 rollback_registered net/core/dev.c:9607 [inline]
 unregister_netdevice_queue+0x1fd/0x420 net/core/dev.c:10752
 unregister_netdevice include/linux/netdevice.h:2869 [inline]
 __tun_detach+0xfa8/0x1240 drivers/net/tun.c:681
 tun_detach drivers/net/tun.c:698 [inline]
 tun_chr_close+0xc4/0x180 drivers/net/tun.c:3451
 __fput+0x285/0x980 fs/file_table.c:281
 task_work_run+0xe2/0x1a0 kernel/task_work.c:151
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:164 [inline]
 exit_to_user_mode_prepare+0x155/0x160 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x38/0x230 kernel/entry/common.c:266
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888040bf5600
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 40 bytes inside of
 192-byte region [ffff888040bf5600, ffff888040bf56c0)
The buggy address belongs to the page:
page:000000000f69fcf8 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888040bf5100 pfn:0x40bf5
flags: 0x100000000000200(slab)
raw: 0100000000000200 ffffea0000e5d3c0 0000000500000005 ffff888007c41500
raw: ffff888040bf5100 000000008010000f 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888040bf5500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888040bf5580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888040bf5600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff888040bf5680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888040bf5700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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