================================================================== BUG: KASAN: slab-use-after-free in device_for_each_child+0x18f/0x1a0 drivers/base/core.c:3996 Read of size 8 at addr ffff8880509a9308 by task kbnepd bnep0/7473 CPU: 3 UID: 0 PID: 7473 Comm: kbnepd bnep0 Not tainted 6.12.0-syzkaller-03657-g43fb83c17ba2 #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: __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+0x1f95/0x2a50 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 Allocated by task 7335: 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:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:257 [inline] __do_kmalloc_node mm/slub.c:4264 [inline] __kmalloc_noprof+0x1e8/0x410 mm/slub.c:4276 kmalloc_noprof include/linux/slab.h:883 [inline] kzalloc_noprof include/linux/slab.h:1015 [inline] hci_alloc_dev_priv+0x1d/0x2820 net/bluetooth/hci_core.c:2440 hci_alloc_dev include/net/bluetooth/hci_core.h:1621 [inline] __vhci_create_device+0xef/0x7d0 drivers/bluetooth/hci_vhci.c:399 vhci_create_device drivers/bluetooth/hci_vhci.c:470 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:527 [inline] vhci_write+0x2c3/0x470 drivers/bluetooth/hci_vhci.c:607 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:679 ksys_write+0x12b/0x250 fs/read_write.c:731 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 7335: 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 mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kfree+0x14f/0x4b0 mm/slub.c:4727 hci_release_dev+0x4d9/0x600 net/bluetooth/hci_core.c:2759 bt_host_release+0x6a/0xb0 net/bluetooth/hci_sysfs.c:94 device_release+0xa1/0x240 drivers/base/core.c:2574 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1e4/0x5a0 lib/kobject.c:737 put_device+0x1f/0x30 drivers/base/core.c:3780 vhci_release+0x81/0xf0 drivers/bluetooth/hci_vhci.c:665 __fput+0x3f8/0xb60 fs/file_table.c:450 task_work_run+0x14e/0x250 kernel/task_work.c:239 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0xadd/0x2d70 kernel/exit.c:938 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087 __do_sys_exit_group kernel/exit.c:1098 [inline] __se_sys_exit_group kernel/exit.c:1096 [inline] __ia32_sys_exit_group+0x3e/0x50 kernel/exit.c:1096 ia32_sys_call+0x1b1c/0x1c20 arch/x86/include/generated/asm/syscalls_32.h:253 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 Last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:541 insert_work+0x36/0x230 kernel/workqueue.c:2183 __queue_work+0x3f8/0x1080 kernel/workqueue.c:2343 queue_work_on+0x11a/0x140 kernel/workqueue.c:2390 process_one_work+0x958/0x1b30 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 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 Second to last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:541 insert_work+0x36/0x230 kernel/workqueue.c:2183 __queue_work+0x97e/0x1080 kernel/workqueue.c:2339 call_timer_fn+0x1a0/0x610 kernel/time/timer.c:1793 expire_timers kernel/time/timer.c:1839 [inline] __run_timers+0x56a/0x930 kernel/time/timer.c:2418 __run_timer_base kernel/time/timer.c:2430 [inline] __run_timer_base kernel/time/timer.c:2422 [inline] run_timer_base+0x114/0x190 kernel/time/timer.c:2439 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2449 handle_softirqs+0x213/0x8f0 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:655 irq_exit_rcu+0x9/0x30 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 The buggy address belongs to the object at ffff8880509a8000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 4872 bytes inside of freed 8192-byte region [ffff8880509a8000, ffff8880509aa000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x509a8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 ksm flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000040 ffff88801ac43180 ffffea000134f400 dead000000000003 raw: 0000000000000000 0000000000020002 00000001f5000000 0000000000000000 head: 04fff00000000040 ffff88801ac43180 ffffea000134f400 dead000000000003 head: 0000000000000000 0000000000020002 00000001f5000000 0000000000000000 head: 04fff00000000003 ffffea0001426a01 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5953, tgid 5953 (syz-executor), ts 38429971184, free_ts 37543661685 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3474 __alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4751 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+0xd1d/0x16f0 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_noprof+0x367/0x440 mm/slub.c:4270 __kvmalloc_node_noprof+0x6f/0x1a0 mm/util.c:658 kvmalloc_array_node_noprof include/linux/slab.h:1041 [inline] __ptr_ring_init_queue_alloc_noprof include/linux/ptr_ring.h:471 [inline] ptr_ring_init_noprof include/linux/ptr_ring.h:489 [inline] wg_packet_queue_init+0x95/0x320 drivers/net/wireguard/queueing.c:32 wg_newlink+0x301/0x700 drivers/net/wireguard/device.c:353 rtnl_newlink_create net/core/rtnetlink.c:3539 [inline] __rtnl_newlink+0x119c/0x1920 net/core/rtnetlink.c:3759 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3772 rtnetlink_rcv_msg+0x3c7/0xea0 net/core/rtnetlink.c:6675 netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2541 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1347 page last free pid 5870 tgid 5870 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_folios+0xa87/0x14f0 mm/page_alloc.c:2704 folios_put_refs+0x587/0x7b0 mm/swap.c:993 free_pages_and_swap_cache+0x36d/0x510 mm/swap_state.c:332 __tlb_batch_free_encoded_pages+0xf9/0x290 mm/mmu_gather.c:136 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu mm/mmu_gather.c:373 [inline] tlb_finish_mmu+0x168/0x7b0 mm/mmu_gather.c:465 vms_clear_ptes+0x565/0x780 mm/vma.c:1102 vms_complete_munmap_vmas+0x1ce/0x980 mm/vma.c:1144 do_vmi_align_munmap+0x619/0x890 mm/vma.c:1353 do_vmi_munmap+0x20b/0x3e0 mm/vma.c:1401 __vm_munmap+0x14f/0x340 mm/mmap.c:1623 __do_sys_munmap mm/mmap.c:1640 [inline] __se_sys_munmap mm/mmap.c:1637 [inline] __ia32_sys_munmap+0x57/0x80 mm/mmap.c:1637 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 Memory state around the buggy address: ffff8880509a9200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880509a9280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880509a9300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880509a9380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880509a9400: fb fb fb fb fb fb fb fb 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