================================================================== BUG: KASAN: slab-use-after-free in device_for_each_child+0x17a/0x190 drivers/base/core.c:4003 Read of size 8 at addr ffff888020ab1308 by task kbnepd bnep0/5656 CPU: 0 UID: 0 PID: 5656 Comm: kbnepd bnep0 Not tainted 6.11.0-rc2-syzkaller-gc813111d19e6 #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:93 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 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+0x17a/0x190 drivers/base/core.c:4003 pm_runtime_set_memalloc_noio+0xf2/0x180 drivers/base/power/runtime.c:248 netdev_unregister_kobject+0x1ed/0x270 net/core/net-sysfs.c:2106 unregister_netdevice_many_notify+0x103b/0x1e40 net/core/dev.c:11378 unregister_netdevice_many net/core/dev.c:11406 [inline] unregister_netdevice_queue+0x307/0x3f0 net/core/dev.c:11281 unregister_netdevice include/linux/netdevice.h:3129 [inline] unregister_netdev+0x1c/0x30 net/core/dev.c:11424 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 Allocated by task 5612: 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:4158 [inline] __kmalloc_noprof+0x1e8/0x400 mm/slub.c:4170 kmalloc_noprof include/linux/slab.h:685 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] hci_alloc_dev_priv+0x1d/0x2820 net/bluetooth/hci_core.c:2434 hci_alloc_dev include/net/bluetooth/hci_core.h:1626 [inline] __vhci_create_device+0xf0/0x7e0 drivers/bluetooth/hci_vhci.c:399 vhci_create_device drivers/bluetooth/hci_vhci.c:472 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:529 [inline] vhci_write+0x2c9/0x480 drivers/bluetooth/hci_vhci.c:609 new_sync_write fs/read_write.c:497 [inline] vfs_write+0x6b6/0x1140 fs/read_write.c:590 ksys_write+0x12f/0x260 fs/read_write.c:643 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 Freed by task 5612: 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:2252 [inline] slab_free mm/slub.c:4473 [inline] kfree+0x12a/0x3b0 mm/slub.c:4594 hci_release_dev+0x4d9/0x600 net/bluetooth/hci_core.c:2753 bt_host_release+0x6a/0xb0 net/bluetooth/hci_sysfs.c:94 device_release+0xa1/0x240 drivers/base/core.c:2581 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1fa/0x5b0 lib/kobject.c:737 put_device+0x1f/0x30 drivers/base/core.c:3787 vhci_release+0x87/0x100 drivers/bluetooth/hci_vhci.c:667 __fput+0x408/0xbb0 fs/file_table.c:422 task_work_run+0x14e/0x250 kernel/task_work.c:228 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xaa3/0x2bb0 kernel/exit.c:882 do_group_exit+0xd3/0x2a0 kernel/exit.c:1031 __do_sys_exit_group kernel/exit.c:1042 [inline] __se_sys_exit_group kernel/exit.c:1040 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1040 x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232 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 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:2185 __queue_work+0x97e/0x1070 kernel/workqueue.c:2341 queue_work_on+0x11a/0x140 kernel/workqueue.c:2392 l2cap_chan_send+0xb86/0x2a30 net/bluetooth/l2cap_core.c:2577 l2cap_sock_sendmsg+0x228/0x300 net/bluetooth/l2cap_sock.c:1128 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] sock_sendmsg+0x3cb/0x470 net/socket.c:768 bnep_tx_frame net/bluetooth/bnep/core.c:466 [inline] bnep_session+0x12fb/0x2d60 net/bluetooth/bnep/core.c:509 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:2185 __queue_work+0x97e/0x1070 kernel/workqueue.c:2341 queue_work_on+0x11a/0x140 kernel/workqueue.c:2392 l2cap_chan_send+0xb86/0x2a30 net/bluetooth/l2cap_core.c:2577 l2cap_sock_sendmsg+0x228/0x300 net/bluetooth/l2cap_sock.c:1128 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] sock_sendmsg+0x3cb/0x470 net/socket.c:768 bnep_tx_frame net/bluetooth/bnep/core.c:466 [inline] bnep_session+0x12fb/0x2d60 net/bluetooth/bnep/core.c:509 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 The buggy address belongs to the object at ffff888020ab0000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 4872 bytes inside of freed 8192-byte region [ffff888020ab0000, ffff888020ab2000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x20ab0 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: 0xfdffffff(slab) raw: 00fff00000000040 ffff888015843180 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000020002 00000001fdffffff 0000000000000000 head: 00fff00000000040 ffff888015843180 dead000000000122 0000000000000000 head: 0000000000000000 0000000000020002 00000001fdffffff 0000000000000000 head: 00fff00000000003 ffffea000082ac01 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 5612, tgid 5612 (syz-executor.0), ts 95565661018, free_ts 95519277216 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3442 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4700 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x4e/0xf0 mm/slub.c:2321 allocate_slab mm/slub.c:2484 [inline] new_slab+0x84/0x260 mm/slub.c:2537 ___slab_alloc+0xdac/0x1870 mm/slub.c:3723 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] __do_kmalloc_node mm/slub.c:4157 [inline] __kmalloc_noprof+0x367/0x400 mm/slub.c:4170 kmalloc_noprof include/linux/slab.h:685 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] hci_alloc_dev_priv+0x1d/0x2820 net/bluetooth/hci_core.c:2434 hci_alloc_dev include/net/bluetooth/hci_core.h:1626 [inline] __vhci_create_device+0xf0/0x7e0 drivers/bluetooth/hci_vhci.c:399 vhci_create_device drivers/bluetooth/hci_vhci.c:472 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:529 [inline] vhci_write+0x2c9/0x480 drivers/bluetooth/hci_vhci.c:609 new_sync_write fs/read_write.c:497 [inline] vfs_write+0x6b6/0x1140 fs/read_write.c:590 ksys_write+0x12f/0x260 fs/read_write.c:643 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 5456 tgid 5456 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_page+0x64a/0xe40 mm/page_alloc.c:2612 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:3988 [inline] slab_alloc_node mm/slub.c:4037 [inline] kmem_cache_alloc_node_noprof+0x153/0x310 mm/slub.c:4080 __alloc_skb+0x2b1/0x380 net/core/skbuff.c:664 alloc_skb_fclone include/linux/skbuff.h:1370 [inline] tcp_stream_alloc_skb+0x34/0x570 net/ipv4/tcp.c:882 tcp_sendmsg_locked+0xecc/0x3550 net/ipv4/tcp.c:1164 tcp_sendmsg+0x2e/0x50 net/ipv4/tcp.c:1354 inet_sendmsg+0xb9/0x140 net/ipv4/af_inet.c:853 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] sock_write_iter+0x4b8/0x5c0 net/socket.c:1160 new_sync_write fs/read_write.c:497 [inline] vfs_write+0x6b6/0x1140 fs/read_write.c:590 ksys_write+0x1f8/0x260 fs/read_write.c:643 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: ffff888020ab1200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888020ab1280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888020ab1300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888020ab1380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888020ab1400: fb 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