================================================================== BUG: KASAN: slab-use-after-free in device_for_each_child+0xa7/0x170 drivers/base/core.c:4045 Read of size 8 at addr ffff88807c2d9320 by task kbnepd bnep0/5847 CPU: 0 PID: 5847 Comm: kbnepd bnep0 Not tainted 6.9.0-syzkaller-12108-gb4d88a60fe0e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 device_for_each_child+0xa7/0x170 drivers/base/core.c:4045 pm_runtime_set_memalloc_noio+0x114/0x260 drivers/base/power/runtime.c:248 netdev_unregister_kobject+0x178/0x250 net/core/net-sysfs.c:2106 unregister_netdevice_many_notify+0x11b7/0x16b0 net/core/dev.c:11248 unregister_netdevice_many net/core/dev.c:11276 [inline] unregister_netdevice_queue+0x303/0x370 net/core/dev.c:11155 unregister_netdevice include/linux/netdevice.h:3119 [inline] unregister_netdev+0x1c/0x30 net/core/dev.c:11294 bnep_session+0x2e09/0x3000 net/bluetooth/bnep/core.c:525 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 5719: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4121 [inline] __kmalloc_noprof+0x1f9/0x400 mm/slub.c:4134 kmalloc_noprof include/linux/slab.h:664 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] hci_alloc_dev_priv+0x27/0x2030 net/bluetooth/hci_core.c:2505 hci_alloc_dev include/net/bluetooth/hci_core.h:1631 [inline] __vhci_create_device drivers/bluetooth/hci_vhci.c:399 [inline] vhci_create_device+0x118/0x6d0 drivers/bluetooth/hci_vhci.c:472 vhci_get_user drivers/bluetooth/hci_vhci.c:529 [inline] vhci_write+0x3cb/0x480 drivers/bluetooth/hci_vhci.c:609 new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa72/0xc90 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5719: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2195 [inline] slab_free mm/slub.c:4436 [inline] kfree+0x149/0x360 mm/slub.c:4557 hci_release_dev+0x151b/0x16b0 net/bluetooth/hci_core.c:2821 bt_host_release+0x83/0x90 net/bluetooth/hci_sysfs.c:94 device_release+0x99/0x1c0 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22f/0x480 lib/kobject.c:737 vhci_release+0x8b/0xd0 drivers/bluetooth/hci_vhci.c:667 __fput+0x406/0x8b0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa27/0x27e0 kernel/exit.c:874 do_group_exit+0x207/0x2c0 kernel/exit.c:1023 __do_sys_exit_group kernel/exit.c:1034 [inline] __se_sys_exit_group kernel/exit.c:1032 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1032 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 insert_work+0x3e/0x330 kernel/workqueue.c:2207 __queue_work+0xc16/0xee0 kernel/workqueue.c:2359 queue_work_on+0x1c2/0x380 kernel/workqueue.c:2410 l2cap_chan_send+0x3d6/0x2680 l2cap_sock_sendmsg+0x1b4/0x2c0 net/bluetooth/l2cap_sock.c:1128 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 sock_sendmsg net/socket.c:768 [inline] kernel_sendmsg+0x151/0x220 net/socket.c:792 bnep_tx_frame net/bluetooth/bnep/core.c:466 [inline] bnep_session+0x2877/0x3000 net/bluetooth/bnep/core.c:509 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/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+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 insert_work+0x3e/0x330 kernel/workqueue.c:2207 __queue_work+0xc16/0xee0 kernel/workqueue.c:2359 queue_work_on+0x1c2/0x380 kernel/workqueue.c:2410 l2cap_chan_send+0x3d6/0x2680 l2cap_sock_sendmsg+0x1b4/0x2c0 net/bluetooth/l2cap_sock.c:1128 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 sock_sendmsg net/socket.c:768 [inline] kernel_sendmsg+0x151/0x220 net/socket.c:792 bnep_tx_frame net/bluetooth/bnep/core.c:466 [inline] bnep_session+0x2877/0x3000 net/bluetooth/bnep/core.c:509 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff88807c2d8000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 4896 bytes inside of freed 8192-byte region [ffff88807c2d8000, ffff88807c2da000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7c2d8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000040 ffff888015042280 ffffea0001f17800 dead000000000005 raw: 0000000000000000 0000000000020002 00000001ffffefff 0000000000000000 head: 00fff00000000040 ffff888015042280 ffffea0001f17800 dead000000000005 head: 0000000000000000 0000000000020002 00000001ffffefff 0000000000000000 head: 00fff00000000003 ffffea0001f0b601 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 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4910, tgid 4910 (dhcpcd-run-hook), ts 46391067485, free_ts 46386722190 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1468 prep_new_page mm/page_alloc.c:1476 [inline] get_page_from_freelist+0x2e2d/0x2ee0 mm/page_alloc.c:3402 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4660 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2264 allocate_slab+0x5a/0x2e0 mm/slub.c:2427 new_slab mm/slub.c:2480 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3666 __slab_alloc+0x58/0xa0 mm/slub.c:3756 __slab_alloc_node mm/slub.c:3809 [inline] slab_alloc_node mm/slub.c:3988 [inline] kmalloc_trace_noprof+0x1d5/0x2c0 mm/slub.c:4147 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] tomoyo_print_bprm security/tomoyo/audit.c:26 [inline] tomoyo_init_log+0x11ce/0x2050 security/tomoyo/audit.c:264 tomoyo_supervisor+0x38a/0x11f0 security/tomoyo/common.c:2089 tomoyo_audit_env_log security/tomoyo/environ.c:36 [inline] tomoyo_env_perm+0x178/0x210 security/tomoyo/environ.c:63 tomoyo_environ security/tomoyo/domain.c:672 [inline] tomoyo_find_next_domain+0x1384/0x1cf0 security/tomoyo/domain.c:878 tomoyo_bprm_check_security+0x115/0x180 security/tomoyo/tomoyo.c:102 security_bprm_check+0x65/0x90 security/security.c:1191 search_binary_handler fs/exec.c:1785 [inline] exec_binprm fs/exec.c:1839 [inline] bprm_execve+0xa56/0x17c0 fs/exec.c:1891 do_execveat_common+0x553/0x700 fs/exec.c:1998 page last free pid 4910 tgid 4910 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1088 [inline] free_unref_page+0xd19/0xea0 mm/page_alloc.c:2565 discard_slab mm/slub.c:2526 [inline] __put_partials+0xeb/0x130 mm/slub.c:2994 put_cpu_partial+0x17c/0x250 mm/slub.c:3069 __slab_free+0x2ea/0x3d0 mm/slub.c:4306 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3940 [inline] slab_alloc_node mm/slub.c:4000 [inline] __do_kmalloc_node mm/slub.c:4120 [inline] __kmalloc_noprof+0x1a3/0x400 mm/slub.c:4134 kmalloc_noprof include/linux/slab.h:664 [inline] tomoyo_add_entry security/tomoyo/common.c:2023 [inline] tomoyo_supervisor+0xe0d/0x11f0 security/tomoyo/common.c:2095 tomoyo_audit_env_log security/tomoyo/environ.c:36 [inline] tomoyo_env_perm+0x178/0x210 security/tomoyo/environ.c:63 tomoyo_environ security/tomoyo/domain.c:672 [inline] tomoyo_find_next_domain+0x1384/0x1cf0 security/tomoyo/domain.c:878 tomoyo_bprm_check_security+0x115/0x180 security/tomoyo/tomoyo.c:102 security_bprm_check+0x65/0x90 security/security.c:1191 search_binary_handler fs/exec.c:1785 [inline] exec_binprm fs/exec.c:1839 [inline] bprm_execve+0xa56/0x17c0 fs/exec.c:1891 do_execveat_common+0x553/0x700 fs/exec.c:1998 do_execve fs/exec.c:2072 [inline] __do_sys_execve fs/exec.c:2148 [inline] __se_sys_execve fs/exec.c:2143 [inline] __x64_sys_execve+0x92/0xb0 fs/exec.c:2143 Memory state around the buggy address: ffff88807c2d9200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807c2d9280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807c2d9300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807c2d9380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807c2d9400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================