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_conn_ready net/bluetooth/l2cap_core.c:1624 [inline] BUG: KASAN: slab-use-after-free in l2cap_connect_cfm+0x6df/0x1070 net/bluetooth/l2cap_core.c:7276 Read of size 8 at addr ffff88802acd4480 by task kworker/u5:8/5786 CPU: 1 PID: 5786 Comm: kworker/u5:8 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: hci3 hci_rx_work Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xa8/0x210 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 l2cap_conn_ready net/bluetooth/l2cap_core.c:1624 [inline] l2cap_connect_cfm+0x6df/0x1070 net/bluetooth/l2cap_core.c:7276 hci_connect_cfm+0x8f/0x130 include/net/bluetooth/hci_core.h:1999 le_conn_complete_evt+0xfdc/0x1540 net/bluetooth/hci_event.c:5786 hci_le_conn_complete_evt+0x187/0x440 net/bluetooth/hci_event.c:5812 hci_event_func net/bluetooth/hci_event.c:7454 [inline] hci_event_packet+0x7ba/0x1270 net/bluetooth/hci_event.c:7509 hci_rx_work+0x43a/0xd60 net/bluetooth/hci_core.c:4018 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Allocated by task 5786: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] l2cap_chan_create+0x50/0x760 net/bluetooth/l2cap_core.c:445 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1890 [inline] l2cap_sock_new_connection_cb+0x182/0x2a0 net/bluetooth/l2cap_sock.c:1469 l2cap_connect_cfm+0x375/0x1070 net/bluetooth/l2cap_core.c:7259 hci_connect_cfm+0x8f/0x130 include/net/bluetooth/hci_core.h:1999 le_conn_complete_evt+0xfdc/0x1540 net/bluetooth/hci_event.c:5786 hci_le_conn_complete_evt+0x187/0x440 net/bluetooth/hci_event.c:5812 hci_event_func net/bluetooth/hci_event.c:7454 [inline] hci_event_packet+0x7ba/0x1270 net/bluetooth/hci_event.c:7509 hci_rx_work+0x43a/0xd60 net/bluetooth/hci_core.c:4018 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Freed by task 8860: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1811 [inline] slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837 slab_free mm/slub.c:3830 [inline] __kmem_cache_free+0xba/0x1e0 mm/slub.c:3843 l2cap_sock_cleanup_listen+0xea/0x3e0 net/bluetooth/l2cap_sock.c:1452 l2cap_sock_release+0x6a/0x1e0 net/bluetooth/l2cap_sock.c:1410 __sock_release net/socket.c:659 [inline] sock_close+0xbd/0x230 net/socket.c:1420 __fput+0x234/0x970 fs/file_table.c:384 task_work_run+0x1d4/0x260 kernel/task_work.c:245 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88802acd4000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1152 bytes inside of freed 2048-byte region [ffff88802acd4000, ffff88802acd4800) The buggy address belongs to the physical page: page:ffffea0000ab3400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2acd0 head:ffffea0000ab3400 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 ffff888017c42000 ffffea0001f6e600 dead000000000002 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 18061814134, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581 prep_new_page mm/page_alloc.c:1588 [inline] get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4486 alloc_page_interleave+0x24/0x1e0 mm/mempolicy.c:2120 alloc_slab_page+0x5d/0x160 mm/slub.c:1881 allocate_slab mm/slub.c:2028 [inline] new_slab+0x87/0x2d0 mm/slub.c:2081 ___slab_alloc+0xc5d/0x12f0 mm/slub.c:3253 __slab_alloc mm/slub.c:3339 [inline] __slab_alloc_node mm/slub.c:3392 [inline] slab_alloc_node mm/slub.c:3485 [inline] __kmem_cache_alloc_node+0x19e/0x250 mm/slub.c:3534 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] __media_device_register+0x58/0x270 drivers/media/mc/mc-device.c:724 vivid_create_devnodes+0x2149/0x2cd0 drivers/media/test-drivers/vivid/vivid-core.c:1712 vivid_create_instance drivers/media/test-drivers/vivid/vivid-core.c:1951 [inline] vivid_probe+0x47e8/0x5c80 drivers/media/test-drivers/vivid/vivid-core.c:2004 platform_probe+0x13b/0x1c0 drivers/base/platform.c:1404 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x25b/0xb20 drivers/base/dd.c:658 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:800 driver_probe_device+0x4f/0x420 drivers/base/dd.c:830 page_owner free stack trace missing Memory state around the buggy address: ffff88802acd4380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802acd4400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802acd4480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802acd4500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802acd4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================