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:1619 [inline] BUG: KASAN: slab-use-after-free in l2cap_connect_cfm+0xdbe/0xf80 net/bluetooth/l2cap_core.c:7278 Read of size 8 at addr ffff88802ae39480 by task kworker/u9:4/5836 CPU: 0 UID: 0 PID: 5836 Comm: kworker/u9:4 Not tainted 6.12.0-rc6-syzkaller-00169-g906bd684e4b1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Workqueue: hci3 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 l2cap_conn_ready net/bluetooth/l2cap_core.c:1619 [inline] l2cap_connect_cfm+0xdbe/0xf80 net/bluetooth/l2cap_core.c:7278 hci_connect_cfm include/net/bluetooth/hci_core.h:1960 [inline] le_conn_complete_evt+0x1662/0x1d80 net/bluetooth/hci_event.c:5758 hci_le_conn_complete_evt+0x23c/0x370 net/bluetooth/hci_event.c:5784 hci_le_meta_evt+0x2e2/0x5d0 net/bluetooth/hci_event.c:7132 hci_event_func net/bluetooth/hci_event.c:7440 [inline] hci_event_packet+0x666/0x1180 net/bluetooth/hci_event.c:7495 hci_rx_work+0x2c6/0x16c0 net/bluetooth/hci_core.c:4031 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 5836: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kmalloc_noprof include/linux/slab.h:878 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] l2cap_chan_create+0x44/0x920 net/bluetooth/l2cap_core.c:449 l2cap_sock_alloc.constprop.0+0xf3/0x180 net/bluetooth/l2cap_sock.c:1886 l2cap_sock_new_connection_cb+0x101/0x240 net/bluetooth/l2cap_sock.c:1468 l2cap_connect_cfm+0x4c9/0xf80 net/bluetooth/l2cap_core.c:7261 hci_connect_cfm include/net/bluetooth/hci_core.h:1960 [inline] le_conn_complete_evt+0x1662/0x1d80 net/bluetooth/hci_event.c:5758 hci_le_conn_complete_evt+0x23c/0x370 net/bluetooth/hci_event.c:5784 hci_le_meta_evt+0x2e2/0x5d0 net/bluetooth/hci_event.c:7132 hci_event_func net/bluetooth/hci_event.c:7440 [inline] hci_event_packet+0x666/0x1180 net/bluetooth/hci_event.c:7495 hci_rx_work+0x2c6/0x16c0 net/bluetooth/hci_core.c:4031 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 6542: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kfree+0x14f/0x4b0 mm/slub.c:4727 l2cap_chan_destroy net/bluetooth/l2cap_core.c:495 [inline] kref_put include/linux/kref.h:65 [inline] l2cap_chan_put+0x216/0x2c0 net/bluetooth/l2cap_core.c:519 l2cap_sock_cleanup_listen+0x4d/0x2a0 net/bluetooth/l2cap_sock.c:1451 l2cap_sock_release+0x5c/0x210 net/bluetooth/l2cap_sock.c:1411 __sock_release+0xb0/0x270 net/socket.c:658 sock_close+0x1c/0x30 net/socket.c:1426 __fput+0x3f6/0xb60 fs/file_table.c:431 task_work_run+0x14e/0x250 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:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802ae39000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1152 bytes inside of freed 2048-byte region [ffff88802ae39000, ffff88802ae39800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ae38 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b042000 0000000000000000 dead000000000001 raw: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801b042000 0000000000000000 dead000000000001 head: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea0000ab8e01 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 35, tgid 35 (kworker/u8:2), ts 61343827384, free_ts 61278024771 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0xf7d/0x2d10 mm/page_alloc.c:3457 __alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265 alloc_slab_page mm/slub.c:2412 [inline] allocate_slab mm/slub.c:2578 [inline] new_slab+0x2c9/0x410 mm/slub.c:2631 ___slab_alloc+0xdac/0x1880 mm/slub.c:3818 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3908 __slab_alloc_node mm/slub.c:3961 [inline] slab_alloc_node mm/slub.c:4122 [inline] __do_kmalloc_node mm/slub.c:4263 [inline] __kmalloc_node_track_caller_noprof+0x355/0x430 mm/slub.c:4283 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:609 __alloc_skb+0x164/0x380 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1322 [inline] alloc_skb_with_frags+0xe4/0x850 net/core/skbuff.c:6612 sock_alloc_send_pskb+0x7f1/0x980 net/core/sock.c:2883 sock_alloc_send_skb include/net/sock.h:1782 [inline] mld_newpack.isra.0+0x1ed/0x790 net/ipv6/mcast.c:1747 add_grhead+0x299/0x340 net/ipv6/mcast.c:1850 add_grec+0x111e/0x1670 net/ipv6/mcast.c:1988 mld_send_initial_cr.part.0+0xe2/0x260 net/ipv6/mcast.c:2234 page last free pid 5833 tgid 5833 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0x5f4/0xdc0 mm/page_alloc.c:2638 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4085 [inline] slab_alloc_node mm/slub.c:4134 [inline] kmem_cache_alloc_noprof+0x121/0x2f0 mm/slub.c:4141 getname_kernel+0x52/0x370 fs/namei.c:234 kern_path+0x1d/0x50 fs/namei.c:2716 do_loopback fs/namespace.c:2764 [inline] path_mount+0xbfa/0x1f20 fs/namespace.c:3828 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount fs/namespace.c:4034 [inline] __x64_sys_mount+0x294/0x320 fs/namespace.c:4034 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88802ae39380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802ae39400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802ae39480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802ae39500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802ae39580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================