================================================================== BUG: KASAN: slab-use-after-free in cfusbl_device_notify+0x17e/0x5e0 net/caif/caif_usb.c:142 Read of size 8 at addr ffff88803b7c8bd0 by task syz.0.3493/18808 CPU: 1 UID: 0 PID: 18808 Comm: syz.0.3493 Not tainted 6.12.0-rc5-syzkaller-01053-gdbb9a7ef3478 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 cfusbl_device_notify+0x17e/0x5e0 net/caif/caif_usb.c:142 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] register_netdevice+0x1274/0x1b00 net/core/dev.c:10549 register_netdev+0x3b/0x50 net/core/dev.c:10691 bnep_add_connection+0x823/0xd80 net/bluetooth/bnep/core.c:624 do_bnep_sock_ioctl+0x4f8/0x8d0 net/bluetooth/bnep/sock.c:83 sock_do_ioctl+0x158/0x460 net/socket.c:1227 sock_ioctl+0x626/0x8e0 net/socket.c:1346 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc532d7e719 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:00007fc533ae9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc532f36208 RCX: 00007fc532d7e719 RDX: 00000000200000c0 RSI: 00000000400442c8 RDI: 000000000000000b RBP: 00007fc532df132e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007fc532f36208 R15: 00007ffd979bc6d8 Allocated by task 54: 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:257 [inline] __kmalloc_cache_noprof+0x19c/0x2c0 mm/slub.c:4295 kmalloc_noprof include/linux/slab.h:878 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] __hci_conn_add+0x2f9/0x1850 net/bluetooth/hci_conn.c:935 hci_conn_request_evt+0x5e8/0xdb0 net/bluetooth/hci_event.c:3288 hci_event_func net/bluetooth/hci_event.c:7443 [inline] hci_event_packet+0xac2/0x1540 net/bluetooth/hci_event.c:7495 hci_rx_work+0x3fe/0xd80 net/bluetooth/hci_core.c:4031 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 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 18641: 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:579 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:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kfree+0x1a0/0x440 mm/slub.c:4727 device_release+0x99/0x1c0 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22f/0x480 lib/kobject.c:737 hci_conn_cleanup net/bluetooth/hci_conn.c:174 [inline] hci_conn_del+0x8c4/0xc40 net/bluetooth/hci_conn.c:1163 hci_conn_hash_flush+0x18e/0x240 net/bluetooth/hci_conn.c:2593 hci_dev_close_sync+0xa42/0x11c0 net/bluetooth/hci_sync.c:5205 hci_dev_do_close net/bluetooth/hci_core.c:483 [inline] hci_unregister_dev+0x20b/0x510 net/bluetooth/hci_core.c:2698 vhci_release+0x80/0xd0 drivers/bluetooth/hci_vhci.c:664 __fput+0x23f/0x880 fs/file_table.c:431 task_work_run+0x24f/0x310 kernel/task_work.c:239 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0xa2f/0x28e0 kernel/exit.c:939 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 __do_sys_exit_group kernel/exit.c:1099 [inline] __se_sys_exit_group kernel/exit.c:1097 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 insert_work+0x3e/0x330 kernel/workqueue.c:2183 __queue_work+0xc8b/0xf50 kernel/workqueue.c:2339 queue_delayed_work_on+0x1ca/0x390 kernel/workqueue.c:2552 l2cap_chan_del+0x291/0x5d0 net/bluetooth/l2cap_core.c:674 l2cap_conn_del+0x38a/0x690 net/bluetooth/l2cap_core.c:1785 hci_disconn_cfm include/net/bluetooth/hci_core.h:1975 [inline] hci_conn_hash_flush+0xff/0x240 net/bluetooth/hci_conn.c:2592 hci_dev_close_sync+0xa42/0x11c0 net/bluetooth/hci_sync.c:5205 hci_dev_do_close net/bluetooth/hci_core.c:483 [inline] hci_unregister_dev+0x20b/0x510 net/bluetooth/hci_core.c:2698 vhci_release+0x80/0xd0 drivers/bluetooth/hci_vhci.c:664 __fput+0x23f/0x880 fs/file_table.c:431 task_work_run+0x24f/0x310 kernel/task_work.c:239 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0xa2f/0x28e0 kernel/exit.c:939 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 __do_sys_exit_group kernel/exit.c:1099 [inline] __se_sys_exit_group kernel/exit.c:1097 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88803b7c8000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 3024 bytes inside of freed 8192-byte region [ffff88803b7c8000, ffff88803b7ca000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3b7c8 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 ffff88801ac42280 ffffea0001f14a00 dead000000000004 raw: 0000000000000000 0000000000020002 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801ac42280 ffffea0001f14a00 dead000000000004 head: 0000000000000000 0000000000020002 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea0000edf201 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 16758, tgid 16757 (syz.0.2958), ts 374172048266, free_ts 368755823206 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x303f/0x3190 mm/page_alloc.c:3457 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 alloc_slab_page+0x6a/0x120 mm/slub.c:2412 allocate_slab+0x5a/0x2f0 mm/slub.c:2578 new_slab mm/slub.c:2631 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3818 __slab_alloc+0x58/0xa0 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+0x281/0x440 mm/slub.c:4283 __do_krealloc mm/slab_common.c:1220 [inline] krealloc_noprof+0x88/0x120 mm/slab_common.c:1269 copy_array kernel/bpf/verifier.c:1222 [inline] copy_stack_state kernel/bpf/verifier.c:1276 [inline] copy_func_state kernel/bpf/verifier.c:1409 [inline] copy_verifier_state+0x9d5/0x1020 kernel/bpf/verifier.c:1455 push_stack+0x1a7/0x4e0 kernel/bpf/verifier.c:1718 check_cond_jmp_op+0x2171/0x4020 kernel/bpf/verifier.c:15488 do_check+0x96d5/0xfeb0 kernel/bpf/verifier.c:18624 do_check_common+0x14bd/0x1dd0 kernel/bpf/verifier.c:21615 do_check_main kernel/bpf/verifier.c:21706 [inline] bpf_check+0x18cde/0x1e710 kernel/bpf/verifier.c:22418 page last free pid 16644 tgid 16637 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0xcfb/0xf20 mm/page_alloc.c:2638 vfree+0x186/0x2e0 mm/vmalloc.c:3361 __vmalloc_area_node mm/vmalloc.c:3711 [inline] __vmalloc_node_range_noprof+0x1119/0x13f0 mm/vmalloc.c:3828 __bpf_map_area_alloc kernel/bpf/syscall.c:307 [inline] bpf_map_area_alloc+0xfc/0x120 kernel/bpf/syscall.c:314 array_map_alloc+0x285/0x720 kernel/bpf/arraymap.c:141 map_create+0x946/0x11c0 kernel/bpf/syscall.c:1341 __sys_bpf+0x6d1/0x810 kernel/bpf/syscall.c:5635 __do_sys_bpf kernel/bpf/syscall.c:5760 [inline] __se_sys_bpf kernel/bpf/syscall.c:5758 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5758 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88803b7c8a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803b7c8b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88803b7c8b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803b7c8c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803b7c8c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================