kobject: kobject_add_internal failed for hci3:201 with -EEXIST, don't try to register things with the same name in the same directory. Bluetooth: hci3: failed to register connection device ================================================================== BUG: KASAN: slab-use-after-free in l2cap_connect_cfm+0x68b/0x1090 net/bluetooth/l2cap_core.c:7280 Read of size 8 at addr ffff888024d82480 by task kworker/u9:1/11422 CPU: 1 UID: 0 PID: 11422 Comm: kworker/u9:1 Not tainted 6.13.0-rc2-syzkaller-00333-ga0e3919a2df2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024 Workqueue: hci3 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:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 l2cap_connect_cfm+0x68b/0x1090 net/bluetooth/l2cap_core.c:7280 hci_connect_cfm+0x162/0x240 include/net/bluetooth/hci_core.h:2057 le_conn_complete_evt+0xd3e/0x12e0 net/bluetooth/hci_event.c:5763 hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5789 hci_event_func net/bluetooth/hci_event.c:7470 [inline] hci_event_packet+0xa55/0x1540 net/bluetooth/hci_event.c:7525 hci_rx_work+0x3f3/0xdb0 net/bluetooth/hci_core.c:4035 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 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 11422: 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+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x243/0x390 mm/slub.c:4329 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] l2cap_chan_create+0x50/0x760 net/bluetooth/l2cap_core.c:449 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1888 [inline] l2cap_sock_new_connection_cb+0x181/0x2d0 net/bluetooth/l2cap_sock.c:1470 l2cap_connect_cfm+0x336/0x1090 net/bluetooth/l2cap_core.c:7263 hci_connect_cfm+0x162/0x240 include/net/bluetooth/hci_core.h:2057 le_conn_complete_evt+0xd3e/0x12e0 net/bluetooth/hci_event.c:5763 hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5789 hci_event_func net/bluetooth/hci_event.c:7470 [inline] hci_event_packet+0xa55/0x1540 net/bluetooth/hci_event.c:7525 hci_rx_work+0x3f3/0xdb0 net/bluetooth/hci_core.c:4035 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 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 Freed by task 19581: 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:582 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:2353 [inline] slab_free mm/slub.c:4613 [inline] kfree+0x196/0x430 mm/slub.c:4761 l2cap_sock_cleanup_listen+0xed/0x3c0 net/bluetooth/l2cap_sock.c:1453 l2cap_sock_teardown_cb+0x1b2/0x440 net/bluetooth/l2cap_sock.c:1589 l2cap_chan_close+0x2cb/0x9f0 l2cap_sock_shutdown+0xa64/0x1020 net/bluetooth/l2cap_sock.c:1372 l2cap_sock_release+0x79/0x1d0 net/bluetooth/l2cap_sock.c:1416 __sock_release net/socket.c:640 [inline] sock_close+0xbc/0x240 net/socket.c:1408 __fput+0x23c/0xa50 fs/file_table.c:450 task_work_run+0x24f/0x310 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x13f/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888024d82000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1152 bytes inside of freed 2048-byte region [ffff888024d82000, ffff888024d82800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x24d80 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 ffff88801ac42000 ffffea0001858a00 dead000000000002 raw: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801ac42000 ffffea0001858a00 dead000000000002 head: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea0000936001 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 1, tgid 1 (swapper/0), ts 6775742202, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0x3651/0x37a0 mm/page_alloc.c:3474 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4751 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2269 alloc_slab_page+0x6a/0x110 mm/slub.c:2423 allocate_slab+0x5a/0x2b0 mm/slub.c:2589 new_slab mm/slub.c:2642 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3830 __slab_alloc+0x58/0xa0 mm/slub.c:3920 __slab_alloc_node mm/slub.c:3995 [inline] slab_alloc_node mm/slub.c:4156 [inline] __kmalloc_cache_noprof+0x27b/0x390 mm/slub.c:4324 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] serial_base_ctrl_add+0x57/0x300 drivers/tty/serial/serial_base_bus.c:113 serial_core_ctrl_device_add drivers/tty/serial/serial_core.c:3362 [inline] serial_core_register_port+0x34f/0x2870 drivers/tty/serial/serial_core.c:3398 serial8250_register_8250_port+0x1545/0x1ec0 drivers/tty/serial/8250/8250_core.c:820 serial_pnp_probe+0x4f9/0x9d0 drivers/tty/serial/8250/8250_pnp.c:490 pnp_device_probe+0x2ba/0x460 drivers/pnp/driver.c:111 really_probe+0x2b8/0xad0 drivers/base/dd.c:658 __driver_probe_device+0x1a2/0x390 drivers/base/dd.c:800 page_owner free stack trace missing Memory state around the buggy address: ffff888024d82380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888024d82400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888024d82480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888024d82500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888024d82580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================