================================================================== BUG: KASAN: slab-use-after-free in device_for_each_child+0xa7/0x170 drivers/base/core.c:4044 Read of size 8 at addr ffff88805202d320 by task kbnepd bnep0/5839 CPU: 1 PID: 5839 Comm: kbnepd bnep0 Not tainted 6.9.0-syzkaller-07726-g3c999d1ae3c7 #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:4044 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+0x11dd/0x16e0 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 5695: 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:4039 [inline] __kmalloc+0x233/0x4a0 mm/slub.c:4052 kmalloc include/linux/slab.h:632 [inline] kzalloc include/linux/slab.h:749 [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 call_write_iter include/linux/fs.h:2120 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa2d/0xc50 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+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5695: 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+0xa6/0xe0 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:2121 [inline] slab_free mm/slub.c:4353 [inline] kfree+0x153/0x3b0 mm/slub.c:4463 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+0x429/0x8a0 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+0xa1b/0x27e0 kernel/exit.c:878 do_group_exit+0x207/0x2c0 kernel/exit.c:1027 __do_sys_exit_group kernel/exit.c:1038 [inline] __se_sys_exit_group kernel/exit.c:1036 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 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+0xc24/0xef0 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+0xc24/0xef0 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 ffff88805202c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 4896 bytes inside of freed 8192-byte region [ffff88805202c000, ffff88805202e000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x52028 head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888015042280 ffffea0000b5c400 0000000000000004 raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 head: 00fff00000000840 ffff888015042280 ffffea0000b5c400 0000000000000004 head: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 head: 00fff00000000003 ffffea0001480a01 dead000000000122 00000000ffffffff head: 0000000800000000 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 0x1d28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4751, tgid 4751 (dhcpcd), ts 65371962383, free_ts 63610460582 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0x3410/0x35b0 mm/page_alloc.c:3317 __alloc_pages+0x256/0x6c0 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2190 allocate_slab mm/slub.c:2353 [inline] new_slab+0x84/0x2f0 mm/slub.c:2406 ___slab_alloc+0xb07/0x12e0 mm/slub.c:3592 __slab_alloc mm/slub.c:3682 [inline] __slab_alloc_node mm/slub.c:3735 [inline] slab_alloc_node mm/slub.c:3908 [inline] __do_kmalloc_node mm/slub.c:4038 [inline] __kmalloc_node_track_caller+0x2d6/0x4f0 mm/slub.c:4059 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:597 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:666 alloc_skb include/linux/skbuff.h:1308 [inline] netlink_dump+0x1e6/0xe50 net/netlink/af_netlink.c:2297 __netlink_dump_start+0x59d/0x780 net/netlink/af_netlink.c:2454 netlink_dump_start include/linux/netlink.h:340 [inline] rtnetlink_rcv_msg+0xcf7/0x10d0 net/core/rtnetlink.c:6551 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2564 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x8e1/0xcb0 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 page last free pid 142 tgid 142 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x97b/0xaa0 mm/page_alloc.c:2347 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487 __slab_free+0x31b/0x3d0 mm/slub.c:4265 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x5e/0xc0 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:3871 [inline] slab_alloc_node mm/slub.c:3918 [inline] kmalloc_trace+0x16f/0x370 mm/slub.c:4065 kmalloc include/linux/slab.h:628 [inline] netdevice_queue_work drivers/infiniband/core/roce_gid_mgmt.c:643 [inline] netdevice_event+0x37d/0x950 drivers/infiniband/core/roce_gid_mgmt.c:802 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2030 [inline] call_netdevice_notifiers net/core/dev.c:2044 [inline] unregister_netdevice_many_notify+0xd9b/0x16e0 net/core/dev.c:11218 unregister_netdevice_many net/core/dev.c:11276 [inline] default_device_exit_batch+0xa0f/0xa90 net/core/dev.c:11759 ops_exit_list net/core/net_namespace.c:178 [inline] cleanup_net+0x89d/0xcc0 net/core/net_namespace.c:640 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 Memory state around the buggy address: ffff88805202d200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805202d280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805202d300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805202d380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805202d400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================