================================================================== BUG: KASAN: slab-use-after-free in device_for_each_child+0x18f/0x1a0 drivers/base/core.c:3996 Read of size 8 at addr ffff88802b21d308 by task kbnepd bnep0/6078 CPU: 0 UID: 0 PID: 6078 Comm: kbnepd bnep0 Not tainted 6.12.0-rc6-syzkaller #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+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 6036: 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+0x1e8/0x400 mm/slub.c:4276 kmalloc_noprof include/linux/slab.h:882 [inline] kzalloc_noprof include/linux/slab.h:1014 [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:590 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:683 ksys_write+0x12f/0x260 fs/read_write.c:736 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 6036: 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+0x3f6/0xb60 fs/file_table.c:431 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:939 do_group_exit+0xd3/0x2a0 kernel/exit.c:1088 get_signal+0x25fb/0x2770 kernel/signal.c:2917 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 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:2183 __queue_work+0x97e/0x1080 kernel/workqueue.c:2339 queue_work_on+0x11a/0x140 kernel/workqueue.c:2390 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:729 [inline] __sock_sendmsg net/socket.c:744 [inline] sock_sendmsg+0x3cb/0x470 net/socket.c:767 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:2183 __queue_work+0x97e/0x1080 kernel/workqueue.c:2339 queue_work_on+0x11a/0x140 kernel/workqueue.c:2390 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:729 [inline] __sock_sendmsg net/socket.c:744 [inline] sock_sendmsg+0x3cb/0x470 net/socket.c:767 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 ffff88802b21c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 4872 bytes inside of freed 8192-byte region [ffff88802b21c000, ffff88802b21e000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802b218000 pfn:0x2b218 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801b043180 ffffea0000a19010 ffffea0000d71410 raw: ffff88802b218000 0000000000020001 00000001f5000000 0000000000000000 head: 00fff00000000240 ffff88801b043180 ffffea0000a19010 ffffea0000d71410 head: ffff88802b218000 0000000000020001 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea0000ac8601 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 6009, tgid 6009 (syz-executor), ts 42112224539, free_ts 42073968496 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0xf7d/0x2d10 mm/page_alloc.c:3457 __alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4733 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+0xdac/0x1880 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+0x357/0x430 mm/slub.c:4270 __kvmalloc_node_noprof+0x6f/0x1a0 mm/util.c:658 kvmalloc_array_node_noprof include/linux/slab.h:1040 [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] skb_array_init_noprof include/linux/skb_array.h:182 [inline] pfifo_fast_init+0x125/0x3b0 net/sched/sch_generic.c:871 qdisc_create_dflt+0x101/0x440 net/sched/sch_generic.c:1021 attach_one_default_qdisc net/sched/sch_generic.c:1180 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2504 [inline] attach_default_qdiscs net/sched/sch_generic.c:1198 [inline] dev_activate+0x63a/0x12b0 net/sched/sch_generic.c:1257 __dev_open+0x396/0x4e0 net/core/dev.c:1485 __dev_change_flags+0x561/0x720 net/core/dev.c:8845 dev_change_flags+0x8f/0x160 net/core/dev.c:8917 do_setlink+0x1b0e/0x41c0 net/core/rtnetlink.c:2929 page last free pid 6009 tgid 6009 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0x5f4/0xdc0 mm/page_alloc.c:2638 __put_partials+0x14c/0x170 mm/slub.c:3145 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4085 [inline] slab_alloc_node mm/slub.c:4134 [inline] __do_kmalloc_node mm/slub.c:4263 [inline] __kmalloc_node_track_caller_noprof+0x1c1/0x430 mm/slub.c:4283 kstrdup+0x3c/0x70 mm/util.c:64 device_rename+0x88/0x230 drivers/base/core.c:4555 dev_change_name+0x2b5/0x920 net/core/dev.c:1250 do_setlink+0x312f/0x41c0 net/core/rtnetlink.c:2909 __rtnl_newlink+0xc35/0x1920 net/core/rtnetlink.c:3725 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3772 rtnetlink_rcv_msg+0x3c7/0xea0 net/core/rtnetlink.c:6675 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2551 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1901 Memory state around the buggy address: ffff88802b21d200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802b21d280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802b21d300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802b21d380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802b21d400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================