netlink: 'syz.5.2786': attribute type 11 has an invalid length. netlink: 44 bytes leftover after parsing attributes in process `syz.5.2786'. ================================================================== BUG: KASAN: slab-use-after-free in cfusbl_device_notify+0x883/0x900 net/caif/caif_usb.c:142 Read of size 8 at addr ffff888024b44c50 by task syz.5.2786/14866 CPU: 2 UID: 0 PID: 14866 Comm: syz.5.2786 Not tainted 6.15.0-syzkaller-10820-gcd2e103d57e5 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 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:408 [inline] print_report+0xcd/0x680 mm/kasan/report.c:521 kasan_report+0xe0/0x110 mm/kasan/report.c:634 cfusbl_device_notify+0x883/0x900 net/caif/caif_usb.c:142 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] register_netdevice+0x145f/0x2270 net/core/dev.c:11162 register_netdev+0x34/0x50 net/core/dev.c:11220 bnep_add_connection+0x71c/0xd20 net/bluetooth/bnep/core.c:624 do_bnep_sock_ioctl.constprop.0+0x496/0x590 net/bluetooth/bnep/sock.c:83 sock_do_ioctl+0x118/0x280 net/socket.c:1190 sock_ioctl+0x227/0x6b0 net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f307df8e969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f307ed9a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f307e1b5fa0 RCX: 00007f307df8e969 RDX: 0000200000000540 RSI: 00000000400442c8 RDI: 0000000000000007 RBP: 00007f307e010ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f307e1b5fa0 R15: 00007fff3c089108 Allocated by task 5937: 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:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] __hci_conn_add+0x130/0x1b70 net/bluetooth/hci_conn.c:939 hci_conn_add_unset+0x6d/0x100 net/bluetooth/hci_conn.c:1051 hci_conn_request_evt+0x88a/0xaf0 net/bluetooth/hci_event.c:3316 hci_event_func net/bluetooth/hci_event.c:7511 [inline] hci_event_packet+0xa10/0x11c0 net/bluetooth/hci_event.c:7565 hci_rx_work+0x2c5/0x16b0 net/bluetooth/hci_core.c:4036 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 14866: 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:576 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:233 [inline] slab_free_hook mm/slub.c:2380 [inline] slab_free mm/slub.c:4642 [inline] kfree+0x2b4/0x4d0 mm/slub.c:4841 device_release+0xa4/0x240 drivers/base/core.c:2568 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1e7/0x5a0 lib/kobject.c:737 put_device drivers/base/core.c:3800 [inline] device_del+0x6b1/0x9f0 drivers/base/core.c:3904 netdev_register_kobject+0x308/0x3a0 net/core/net-sysfs.c:2342 register_netdevice+0x13dc/0x2270 net/core/dev.c:11104 register_netdev+0x34/0x50 net/core/dev.c:11220 bnep_add_connection+0x71c/0xd20 net/bluetooth/bnep/core.c:624 do_bnep_sock_ioctl.constprop.0+0x496/0x590 net/bluetooth/bnep/sock.c:83 sock_do_ioctl+0x118/0x280 net/socket.c:1190 sock_ioctl+0x227/0x6b0 net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:548 insert_work+0x36/0x230 kernel/workqueue.c:2183 __queue_work+0x97e/0x10f0 kernel/workqueue.c:2341 __queue_delayed_work+0x35b/0x460 kernel/workqueue.c:2509 queue_delayed_work_on+0x1b5/0x200 kernel/workqueue.c:2561 queue_delayed_work include/linux/workqueue.h:677 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1657 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1631 [inline] l2cap_chan_del+0x5a0/0x8f0 net/bluetooth/l2cap_core.c:671 l2cap_conn_del+0x37a/0x730 net/bluetooth/l2cap_core.c:1787 l2cap_disconn_cfm net/bluetooth/l2cap_core.c:7301 [inline] l2cap_disconn_cfm+0x96/0xd0 net/bluetooth/l2cap_core.c:7294 hci_disconn_cfm include/net/bluetooth/hci_core.h:2065 [inline] hci_conn_hash_flush+0x10b/0x260 net/bluetooth/hci_conn.c:2543 hci_dev_close_sync+0x602/0x11d0 net/bluetooth/hci_sync.c:5225 hci_dev_do_close+0x2e/0x90 net/bluetooth/hci_core.c:483 hci_unregister_dev+0x213/0x620 net/bluetooth/hci_core.c:2678 vhci_release+0x79/0xf0 drivers/bluetooth/hci_vhci.c:665 __fput+0x402/0xb70 fs/file_table.c:465 task_work_run+0x14d/0x240 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x864/0x2bd0 kernel/exit.c:955 do_group_exit+0xd3/0x2a0 kernel/exit.c:1104 __do_sys_exit_group kernel/exit.c:1115 [inline] __se_sys_exit_group kernel/exit.c:1113 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1113 x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888024b44000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 3152 bytes inside of freed 8192-byte region [ffff888024b44000, ffff888024b46000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x24b40 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 ffff88801b843180 0000000000000000 dead000000000001 raw: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b843180 0000000000000000 dead000000000001 head: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea000092d001 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 13972, tgid 13971 (syz.9.2493), ts 215439937688, free_ts 215439799386 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419 alloc_slab_page mm/slub.c:2450 [inline] allocate_slab mm/slub.c:2618 [inline] new_slab+0x23b/0x330 mm/slub.c:2672 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3858 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948 __slab_alloc_node mm/slub.c:4023 [inline] slab_alloc_node mm/slub.c:4184 [inline] __kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4353 kmalloc_noprof include/linux/slab.h:905 [inline] audit_log_d_path+0xe7/0x200 kernel/audit.c:2149 audit_log_d_path_exe+0x46/0x70 kernel/audit.c:2219 audit_log_task+0x31d/0x3f0 kernel/auditsc.c:2957 audit_seccomp+0x79/0x290 kernel/auditsc.c:3004 seccomp_log kernel/seccomp.c:1033 [inline] __seccomp_filter+0x60e/0xea0 kernel/seccomp.c:1360 __secure_computing+0x287/0x3b0 kernel/seccomp.c:1388 syscall_trace_enter+0x89/0x260 kernel/entry/common.c:52 syscall_enter_from_user_mode_work include/linux/entry-common.h:170 [inline] syscall_enter_from_user_mode include/linux/entry-common.h:200 [inline] do_syscall_64+0x347/0x4c0 arch/x86/entry/syscall_64.c:90 page last free pid 13972 tgid 13971 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4147 [inline] slab_alloc_node mm/slub.c:4196 [inline] kmem_cache_alloc_noprof+0x1cb/0x3b0 mm/slub.c:4203 audit_buffer_alloc kernel/audit.c:1791 [inline] audit_log_start+0x2c5/0x7f0 kernel/audit.c:1913 audit_seccomp+0x60/0x290 kernel/auditsc.c:3001 seccomp_log kernel/seccomp.c:1033 [inline] __seccomp_filter+0x60e/0xea0 kernel/seccomp.c:1360 __secure_computing+0x287/0x3b0 kernel/seccomp.c:1388 syscall_trace_enter+0x89/0x260 kernel/entry/common.c:52 syscall_enter_from_user_mode_work include/linux/entry-common.h:170 [inline] syscall_enter_from_user_mode include/linux/entry-common.h:200 [inline] do_syscall_64+0x347/0x4c0 arch/x86/entry/syscall_64.c:90 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888024b44b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888024b44b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888024b44c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888024b44c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888024b44d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================