kobject_add_internal failed for hci2:201 with -EEXIST, don't try to register things with the same name in the same directory. Bluetooth: hci2: failed to register connection device ================================================================== BUG: KASAN: use-after-free in l2cap_sock_new_connection_cb+0x1ef/0x2c0 net/bluetooth/l2cap_sock.c:1517 Read of size 8 at addr ffff88801ded0540 by task kworker/u5:0/48 CPU: 0 PID: 48 Comm: kworker/u5:0 Not tainted 6.1.128-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: hci2 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:427 kasan_report+0x136/0x160 mm/kasan/report.c:531 l2cap_sock_new_connection_cb+0x1ef/0x2c0 net/bluetooth/l2cap_sock.c:1517 l2cap_connect_cfm+0x339/0x10a0 net/bluetooth/l2cap_core.c:8319 hci_connect_cfm+0x15c/0x220 include/net/bluetooth/hci_core.h:1809 le_conn_complete_evt+0xd8c/0x1350 net/bluetooth/hci_event.c:5864 hci_le_conn_complete_evt+0x188/0x410 net/bluetooth/hci_event.c:5890 hci_event_func net/bluetooth/hci_event.c:7370 [inline] hci_event_packet+0xa40/0x1510 net/bluetooth/hci_event.c:7425 hci_rx_work+0x3a6/0xd10 net/bluetooth/hci_core.c:4086 process_one_work+0x917/0x1260 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 48: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc+0xb2/0x230 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] sk_prot_alloc+0xe0/0x200 net/core/sock.c:2050 sk_alloc+0x36/0x350 net/core/sock.c:2103 bt_sock_alloc+0x37/0x130 net/bluetooth/af_bluetooth.c:148 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1911 [inline] l2cap_sock_new_connection_cb+0xd8/0x2c0 net/bluetooth/l2cap_sock.c:1502 l2cap_connect_cfm+0x339/0x10a0 net/bluetooth/l2cap_core.c:8319 hci_connect_cfm+0x15c/0x220 include/net/bluetooth/hci_core.h:1809 le_conn_complete_evt+0xd8c/0x1350 net/bluetooth/hci_event.c:5864 hci_le_conn_complete_evt+0x188/0x410 net/bluetooth/hci_event.c:5890 hci_event_func net/bluetooth/hci_event.c:7370 [inline] hci_event_packet+0xa40/0x1510 net/bluetooth/hci_event.c:7425 hci_rx_work+0x3a6/0xd10 net/bluetooth/hci_core.c:4086 process_one_work+0x917/0x1260 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Freed by task 4567: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x25c/0x3c0 mm/slub.c:3674 sk_prot_free net/core/sock.c:2086 [inline] __sk_destruct+0x473/0x5f0 net/core/sock.c:2172 l2cap_sock_cleanup_listen+0xd9/0x270 net/bluetooth/l2cap_sock.c:1482 l2cap_sock_release+0x59/0x1d0 net/bluetooth/l2cap_sock.c:1445 __sock_release net/socket.c:654 [inline] sock_close+0xcd/0x230 net/socket.c:1400 __fput+0x3f6/0x8d0 fs/file_table.c:320 task_work_run+0x246/0x300 kernel/task_work.c:203 get_signal+0x15d0/0x17a0 kernel/signal.c:2648 arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 call_rcu+0x163/0xa10 kernel/rcu/tree.c:2845 netlink_release+0x160b/0x1ab0 net/netlink/af_netlink.c:800 __sock_release net/socket.c:654 [inline] sock_close+0xcd/0x230 net/socket.c:1400 __fput+0x3f6/0x8d0 fs/file_table.c:320 task_work_run+0x246/0x300 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88801ded0000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1344 bytes inside of 2048-byte region [ffff88801ded0000, ffff88801ded0800) The buggy address belongs to the physical page: page:ffffea000077b400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1ded0 head:ffffea000077b400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea000504d200 dead000000000002 ffff888017c42000 raw: 0000000000000000 0000000080080008 00000001ffffffff 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 1, tgid 1 (swapper/0), ts 3133136645, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x3731/0x38d0 mm/page_alloc.c:4328 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5605 alloc_page_interleave+0x22/0x1c0 mm/mempolicy.c:2115 alloc_slab_page+0x6a/0x150 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] acpi_os_allocate_zeroed include/acpi/platform/aclinuxex.h:57 [inline] acpi_ds_create_walk_state+0xff/0x2a0 drivers/acpi/acpica/dswstate.c:518 acpi_ds_auto_serialize_method+0xe3/0x240 drivers/acpi/acpica/dsmethod.c:81 acpi_ds_init_one_object+0x1b7/0x360 drivers/acpi/acpica/dsinit.c:110 acpi_ns_walk_namespace+0x28c/0x4e0 acpi_ds_initialize_objects+0x195/0x2a0 drivers/acpi/acpica/dsinit.c:189 acpi_ns_load_table+0xf5/0x120 drivers/acpi/acpica/nsload.c:106 acpi_tb_load_namespace+0x289/0x6c0 drivers/acpi/acpica/tbxfload.c:158 page_owner free stack trace missing Memory state around the buggy address: ffff88801ded0400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801ded0480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801ded0500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801ded0580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801ded0600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================