================================================================== BUG: KASAN: slab-use-after-free in cfusbl_device_notify+0x18a/0x6e0 net/caif/caif_usb.c:142 Read of size 8 at addr ffff888032ed8c50 by task syz.2.988/9775 CPU: 0 UID: 0 PID: 9775 Comm: syz.2.988 Not tainted 6.15.0-rc2-syzkaller-00563-g240ce924d271 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 cfusbl_device_notify+0x18a/0x6e0 net/caif/caif_usb.c:142 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2266 [inline] call_netdevice_notifiers net/core/dev.c:2280 [inline] register_netdevice+0x1264/0x1b80 net/core/dev.c:11059 register_netdev+0x40/0x50 net/core/dev.c:11180 bnep_add_connection+0x865/0xe80 net/bluetooth/bnep/core.c:624 do_bnep_sock_ioctl+0x526/0x920 net/bluetooth/bnep/sock.c:83 sock_do_ioctl+0x152/0x400 net/socket.c:1190 sock_ioctl+0x644/0x900 net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f389ab8e169 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:00007f389b9d8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f389adb6080 RCX: 00007f389ab8e169 RDX: 0000200000000540 RSI: 00000000400442c8 RDI: 0000000000000010 RBP: 00007f389ac10a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f389adb6080 R15: 00007ffc1df25d48 Allocated by task 55: 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+0x9d/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x236/0x370 mm/slub.c:4372 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] __hci_conn_add+0x317/0x19c0 net/bluetooth/hci_conn.c:936 hci_conn_request_evt+0x683/0xfa0 net/bluetooth/hci_event.c:3289 hci_event_func net/bluetooth/hci_event.c:7493 [inline] hci_event_packet+0xac9/0x1550 net/bluetooth/hci_event.c:7545 hci_rx_work+0x3f3/0xdb0 net/bluetooth/hci_core.c:4020 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd50 kernel/workqueue.c:3400 kthread+0x7b7/0x940 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 9688: 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:576 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:2398 [inline] slab_free mm/slub.c:4656 [inline] kfree+0x198/0x430 mm/slub.c:4855 device_release+0x99/0x1c0 drivers/base/core.c:-1 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_put include/net/bluetooth/hci_core.h:1624 [inline] l2cap_conn_free net/bluetooth/l2cap_core.c:1809 [inline] kref_put include/linux/kref.h:65 [inline] l2cap_conn_put+0x73/0xc0 net/bluetooth/l2cap_core.c:1822 session_free net/bluetooth/hidp/core.c:989 [inline] kref_put include/linux/kref.h:65 [inline] hidp_session_put+0x1e7/0x220 net/bluetooth/hidp/core.c:996 hidp_session_thread+0x458/0x490 net/bluetooth/hidp/core.c:1305 kthread+0x7b7/0x940 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xbf/0xd0 mm/kasan/generic.c:548 insert_work+0x3e/0x330 kernel/workqueue.c:2183 __queue_work+0xda3/0x10a0 kernel/workqueue.c:2341 queue_delayed_work_on+0x1cc/0x390 kernel/workqueue.c:2561 l2cap_chan_del+0x291/0x5d0 net/bluetooth/l2cap_core.c:671 l2cap_conn_del+0x391/0x690 net/bluetooth/l2cap_core.c:1786 hci_disconn_cfm include/net/bluetooth/hci_core.h:2069 [inline] hci_conn_hash_flush+0xff/0x240 net/bluetooth/hci_conn.c:2701 hci_dev_close_sync+0xa8d/0x1260 net/bluetooth/hci_sync.c:5225 hci_dev_do_close net/bluetooth/hci_core.c:483 [inline] hci_unregister_dev+0x20b/0x510 net/bluetooth/hci_core.c:2678 vhci_release+0x80/0xd0 drivers/bluetooth/hci_vhci.c:665 __fput+0x3e9/0x9f0 fs/file_table.c:465 task_work_run+0x251/0x310 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa11/0x27f0 kernel/exit.c:953 do_group_exit+0x207/0x2c0 kernel/exit.c:1102 __do_sys_exit_group kernel/exit.c:1113 [inline] __se_sys_exit_group kernel/exit.c:1111 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111 x64_sys_call+0x26c3/0x26d0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888032ed8000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 3152 bytes inside of freed 8192-byte region [ffff888032ed8000, ffff888032eda000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x32ed8 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 ffff88801b042280 ffffea0001ffec00 dead000000000005 raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b042280 ffffea0001ffec00 dead000000000005 head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0000cbb601 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 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 7884, tgid 7883 (syz.3.516), ts 145466100857, free_ts 145464768537 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1714 prep_new_page mm/page_alloc.c:1722 [inline] get_page_from_freelist+0x361c/0x37c0 mm/page_alloc.c:3696 __alloc_frozen_pages_noprof+0x211/0x5b0 mm/page_alloc.c:4978 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2468 [inline] allocate_slab+0x8f/0x3b0 mm/slub.c:2632 new_slab mm/slub.c:2686 [inline] ___slab_alloc+0xc3b/0x1500 mm/slub.c:3872 __slab_alloc+0x58/0xa0 mm/slub.c:3962 __slab_alloc_node mm/slub.c:4037 [inline] slab_alloc_node mm/slub.c:4198 [inline] __do_kmalloc_node mm/slub.c:4340 [inline] __kmalloc_node_track_caller_noprof+0x2ef/0x4d0 mm/slub.c:4360 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:599 __alloc_skb+0x1f2/0x480 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1340 [inline] netlink_dump+0x1eb/0xeb0 net/netlink/af_netlink.c:2275 __netlink_dump_start+0x5a2/0x790 net/netlink/af_netlink.c:2424 genl_family_rcv_msg_dumpit net/netlink/genetlink.c:1076 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1192 [inline] genl_rcv_msg+0x8a4/0xf00 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x208/0x480 net/netlink/af_netlink.c:2534 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x7f8/0x9a0 net/netlink/af_netlink.c:1339 page last free pid 53 tgid 53 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1258 [inline] __free_frozen_pages+0xdee/0x10b0 mm/page_alloc.c:2721 discard_slab mm/slub.c:2730 [inline] __put_partials+0x160/0x1c0 mm/slub.c:3199 put_cpu_partial+0x17e/0x250 mm/slub.c:3274 __slab_free+0x294/0x390 mm/slub.c:4526 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4161 [inline] slab_alloc_node mm/slub.c:4210 [inline] kmem_cache_alloc_node_noprof+0x1f2/0x3b0 mm/slub.c:4262 kmalloc_reserve+0xa8/0x2a0 net/core/skbuff.c:577 __alloc_skb+0x1f2/0x480 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1340 [inline] nlmsg_new include/net/netlink.h:1035 [inline] inet_netconf_notify_devconf+0x15a/0x220 net/ipv4/devinet.c:2210 __devinet_sysctl_unregister net/ipv4/devinet.c:2705 [inline] devinet_sysctl_unregister net/ipv4/devinet.c:2729 [inline] inetdev_destroy net/ipv4/devinet.c:334 [inline] inetdev_event+0x855/0x1740 net/ipv4/devinet.c:1656 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2266 [inline] call_netdevice_notifiers net/core/dev.c:2280 [inline] unregister_netdevice_many_notify+0x16b7/0x2640 net/core/dev.c:12036 unregister_netdevice_many net/core/dev.c:12099 [inline] unregister_netdevice_queue+0x383/0x400 net/core/dev.c:11943 unregister_netdevice include/linux/netdevice.h:3373 [inline] nsim_destroy+0x21e/0x690 drivers/net/netdevsim/netdev.c:1064 Memory state around the buggy address: ffff888032ed8b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888032ed8b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888032ed8c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888032ed8c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888032ed8d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================