kobject: kobject_add_internal failed for hci4:201 with -EEXIST, don't try to register things with the same name in the same directory. Bluetooth: hci4: failed to register connection device ================================================================== BUG: KASAN: slab-use-after-free in l2cap_conn_ready net/bluetooth/l2cap_core.c:-1 [inline] BUG: KASAN: slab-use-after-free in l2cap_connect_cfm+0x70e/0x1220 net/bluetooth/l2cap_core.c:7278 Read of size 8 at addr ffff8880216b9480 by task kworker/u9:3/5840 CPU: 0 UID: 0 PID: 5840 Comm: kworker/u9:3 Not tainted 6.14.0-syzkaller-13546-g16cd1c265776 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: hci4 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 l2cap_conn_ready net/bluetooth/l2cap_core.c:-1 [inline] l2cap_connect_cfm+0x70e/0x1220 net/bluetooth/l2cap_core.c:7278 hci_connect_cfm+0xa4/0x150 include/net/bluetooth/hci_core.h:2054 le_conn_complete_evt+0xcf4/0x12a0 net/bluetooth/hci_event.c:5779 hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5805 hci_event_func net/bluetooth/hci_event.c:7489 [inline] hci_event_packet+0xa5e/0x1550 net/bluetooth/hci_event.c:7544 hci_rx_work+0x3f3/0xdb0 net/bluetooth/hci_core.c:4020 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xac5/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd50 kernel/workqueue.c:3400 kthread+0x7b9/0x940 kernel/kthread.c:464 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 5840: 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:377 [inline] __kasan_kmalloc+0x9d/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x236/0x370 mm/slub.c:4362 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] l2cap_chan_create+0x50/0x760 net/bluetooth/l2cap_core.c:445 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1900 [inline] l2cap_sock_new_connection_cb+0x181/0x2b0 net/bluetooth/l2cap_sock.c:1482 l2cap_connect_cfm+0x37d/0x1220 net/bluetooth/l2cap_core.c:7261 hci_connect_cfm+0xa4/0x150 include/net/bluetooth/hci_core.h:2054 le_conn_complete_evt+0xcf4/0x12a0 net/bluetooth/hci_event.c:5779 hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5805 hci_event_func net/bluetooth/hci_event.c:7489 [inline] hci_event_packet+0xa5e/0x1550 net/bluetooth/hci_event.c:7544 hci_rx_work+0x3f3/0xdb0 net/bluetooth/hci_core.c:4020 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xac5/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd50 kernel/workqueue.c:3400 kthread+0x7b9/0x940 kernel/kthread.c:464 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 6846: 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:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2389 [inline] slab_free mm/slub.c:4646 [inline] kfree+0x198/0x430 mm/slub.c:4845 l2cap_sock_cleanup_listen+0xed/0x3c0 net/bluetooth/l2cap_sock.c:1465 l2cap_sock_release+0x5d/0x1d0 net/bluetooth/l2cap_sock.c:1425 __sock_release net/socket.c:647 [inline] sock_close+0xbe/0x240 net/socket.c:1391 __fput+0x3eb/0x9f0 fs/file_table.c:465 task_work_run+0x253/0x310 kernel/task_work.c:227 get_signal+0x15db/0x1730 kernel/signal.c:2807 arch_do_signal_or_restart+0x98/0x840 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:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880216b9000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1152 bytes inside of freed 2048-byte region [ffff8880216b9000, ffff8880216b9800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x216b8 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: f5(slab) raw: 00fff00000000040 ffff88801b042000 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b042000 dead000000000100 dead000000000122 head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea000085ae01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 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 2623030319, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1717 prep_new_page mm/page_alloc.c:1725 [inline] get_page_from_freelist+0x352b/0x36c0 mm/page_alloc.c:3652 __alloc_frozen_pages_noprof+0x211/0x5b0 mm/page_alloc.c:4934 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2459 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2623 new_slab mm/slub.c:2676 [inline] ___slab_alloc+0xc3b/0x1500 mm/slub.c:3862 __slab_alloc+0x58/0xa0 mm/slub.c:3952 __slab_alloc_node mm/slub.c:4027 [inline] slab_alloc_node mm/slub.c:4188 [inline] __kmalloc_cache_noprof+0x26a/0x370 mm/slub.c:4357 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] acpi_ds_create_walk_state+0x105/0x2a0 drivers/acpi/acpica/dswstate.c:518 acpi_ds_call_control_method+0x143/0x7e0 drivers/acpi/acpica/dsmethod.c:498 acpi_ps_parse_aml+0x2df/0x960 drivers/acpi/acpica/psparse.c:503 acpi_ps_execute_method+0x74d/0x880 drivers/acpi/acpica/psxface.c:190 acpi_ns_evaluate+0x5df/0xa40 drivers/acpi/acpica/nseval.c:205 acpi_evaluate_object+0x59d/0xaf0 drivers/acpi/acpica/nsxfeval.c:354 acpi_evaluate_integer+0x115/0x2f0 drivers/acpi/utils.c:260 acpi_bus_get_status_handle drivers/acpi/bus.c:82 [inline] acpi_bus_get_status+0x1ad/0x470 drivers/acpi/bus.c:111 page_owner free stack trace missing Memory state around the buggy address: ffff8880216b9380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880216b9400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880216b9480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880216b9500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880216b9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================