================================================================== BUG: KASAN: slab-use-after-free in cfusbl_device_notify+0x885/0x910 net/caif/caif_usb.c:142 Read of size 8 at addr ffff888035bf4bf0 by task syz.2.416/7480 CPU: 0 UID: 0 PID: 7480 Comm: syz.2.416 Not tainted 6.13.0-rc3-syzkaller-00062-gc061cf420ded #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024 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:378 [inline] print_report+0xc3/0x620 mm/kasan/report.c:489 kasan_report+0xd9/0x110 mm/kasan/report.c:602 cfusbl_device_notify+0x885/0x910 net/caif/caif_usb.c:142 notifier_call_chain+0xb7/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] register_netdevice+0xe6c/0x1e90 net/core/dev.c:10594 register_netdev+0x2f/0x50 net/core/dev.c:10736 bnep_add_connection+0x71e/0xd20 net/bluetooth/bnep/core.c:624 do_bnep_sock_ioctl.constprop.0+0x498/0x590 net/bluetooth/bnep/sock.c:83 sock_do_ioctl+0x116/0x280 net/socket.c:1209 sock_ioctl+0x228/0x6c0 net/socket.c:1328 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 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 RIP: 0033:0x7f9861b85d29 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:00007f98629d2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f9861d75fa0 RCX: 00007f9861b85d29 RDX: 00000000200000c0 RSI: 00000000400442c8 RDI: 0000000000000005 RBP: 00007f9861c01a20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9861d75fa0 R15: 00007ffec39e9778 Allocated by task 54: 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:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] __hci_conn_add+0x131/0x1ab0 net/bluetooth/hci_conn.c:935 hci_conn_add_unset+0x6d/0x100 net/bluetooth/hci_conn.c:1045 hci_conn_request_evt+0x8be/0xb40 net/bluetooth/hci_event.c:3286 hci_event_func net/bluetooth/hci_event.c:7473 [inline] hci_event_packet+0x9eb/0x1180 net/bluetooth/hci_event.c:7525 hci_rx_work+0x2c5/0x16b0 net/bluetooth/hci_core.c:4035 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 7051: 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:582 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:2353 [inline] slab_free mm/slub.c:4613 [inline] kfree+0x14f/0x4b0 mm/slub.c:4761 device_release+0xa1/0x240 drivers/base/core.c:2567 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1e4/0x5a0 lib/kobject.c:737 put_device drivers/base/core.c:3773 [inline] device_unregister+0x2f/0xc0 drivers/base/core.c:3896 hci_conn_del_sysfs+0xab/0x170 net/bluetooth/hci_sysfs.c:79 hci_conn_cleanup net/bluetooth/hci_conn.c:174 [inline] hci_conn_del+0x54e/0xdb0 net/bluetooth/hci_conn.c:1164 hci_conn_hash_flush+0x4bf/0x790 net/bluetooth/hci_conn.c:2699 hci_dev_close_sync+0x603/0x11a0 net/bluetooth/hci_sync.c:5212 hci_dev_do_close+0x2e/0x90 net/bluetooth/hci_core.c:482 hci_unregister_dev+0x213/0x620 net/bluetooth/hci_core.c:2697 vhci_release+0x79/0xf0 drivers/bluetooth/hci_vhci.c:664 __fput+0x3f8/0xb60 fs/file_table.c:450 task_work_run+0x14e/0x250 kernel/task_work.c:239 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0xadd/0x2d70 kernel/exit.c:938 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087 __do_sys_exit_group kernel/exit.c:1098 [inline] __se_sys_exit_group kernel/exit.c:1096 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1096 x64_sys_call+0x151f/0x1720 arch/x86/include/generated/asm/syscalls_64.h:232 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 Last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:544 insert_work+0x36/0x230 kernel/workqueue.c:2183 __queue_work+0x97e/0x1080 kernel/workqueue.c:2339 __queue_delayed_work+0x21b/0x2e0 kernel/workqueue.c:2507 queue_delayed_work_on+0x12a/0x150 kernel/workqueue.c:2552 queue_delayed_work include/linux/workqueue.h:677 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1642 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1616 [inline] l2cap_chan_del+0x5a0/0x8f0 net/bluetooth/l2cap_core.c:674 l2cap_conn_del+0x37c/0x730 net/bluetooth/l2cap_core.c:1785 hci_disconn_cfm include/net/bluetooth/hci_core.h:2075 [inline] hci_conn_hash_flush+0x44a/0x790 net/bluetooth/hci_conn.c:2698 hci_dev_close_sync+0x603/0x11a0 net/bluetooth/hci_sync.c:5212 hci_dev_do_close+0x2e/0x90 net/bluetooth/hci_core.c:482 hci_unregister_dev+0x213/0x620 net/bluetooth/hci_core.c:2697 vhci_release+0x79/0xf0 drivers/bluetooth/hci_vhci.c:664 __fput+0x3f8/0xb60 fs/file_table.c:450 task_work_run+0x14e/0x250 kernel/task_work.c:239 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0xadd/0x2d70 kernel/exit.c:938 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087 __do_sys_exit_group kernel/exit.c:1098 [inline] __se_sys_exit_group kernel/exit.c:1096 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1096 x64_sys_call+0x151f/0x1720 arch/x86/include/generated/asm/syscalls_64.h:232 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 The buggy address belongs to the object at ffff888035bf4000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 3056 bytes inside of freed 8192-byte region [ffff888035bf4000, ffff888035bf6000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x35bf0 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 ffffea0000d67c00 0000000000000005 raw: 0000000000000000 0000000000020002 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801b042280 ffffea0000d67c00 0000000000000005 head: 0000000000000000 0000000000020002 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea0000d6fc01 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 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5485, tgid 5485 (dhcpcd), ts 102351362223, free_ts 102298954078 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3474 __alloc_pages_noprof+0x223/0x25b0 mm/page_alloc.c:4751 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2269 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab mm/slub.c:2589 [inline] new_slab+0x2c9/0x410 mm/slub.c:2642 ___slab_alloc+0xd7d/0x17a0 mm/slub.c:3830 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3920 __slab_alloc_node mm/slub.c:3995 [inline] slab_alloc_node mm/slub.c:4156 [inline] __do_kmalloc_node mm/slub.c:4297 [inline] __kmalloc_node_track_caller_noprof+0x2f1/0x510 mm/slub.c:4317 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:609 __alloc_skb+0x164/0x380 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1323 [inline] netlink_dump+0x2c1/0xd00 net/netlink/af_netlink.c:2283 netlink_recvmsg+0xa0d/0xf30 net/netlink/af_netlink.c:1973 sock_recvmsg_nosec net/socket.c:1033 [inline] sock_recvmsg+0x1f6/0x250 net/socket.c:1055 ____sys_recvmsg+0x219/0x6b0 net/socket.c:2803 ___sys_recvmsg+0x115/0x1a0 net/socket.c:2845 __sys_recvmsg+0x16b/0x220 net/socket.c:2878 page last free pid 5485 tgid 5485 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x661/0x1080 mm/page_alloc.c:2657 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/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:4119 [inline] slab_alloc_node mm/slub.c:4168 [inline] kmem_cache_alloc_node_noprof+0x223/0x3c0 mm/slub.c:4220 __alloc_skb+0x2b1/0x380 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1323 [inline] netlink_alloc_large_skb+0x69/0x130 net/netlink/af_netlink.c:1196 netlink_sendmsg+0x689/0xd70 net/netlink/af_netlink.c:1866 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg net/socket.c:726 [inline] __sys_sendto+0x488/0x4f0 net/socket.c:2197 __do_sys_sendto net/socket.c:2204 [inline] __se_sys_sendto net/socket.c:2200 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2200 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: ffff888035bf4a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888035bf4b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888035bf4b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888035bf4c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888035bf4c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================