================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x114/0x7680 kernel/locking/lockdep.c:4919 Read of size 8 at addr ffff0000dad9d888 by task syz.5.910/8047 CPU: 0 PID: 8047 Comm: syz.5.910 Not tainted 6.1.131-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:427 kasan_report+0xd4/0x130 mm/kasan/report.c:531 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 __lock_acquire+0x114/0x7680 kernel/locking/lockdep.c:4919 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x6c/0xb4 kernel/locking/spinlock.c:162 skb_dequeue net/core/skbuff.c:3421 [inline] skb_queue_purge+0x40/0x1a4 net/core/skbuff.c:3459 vhci_flush+0x48/0x5c drivers/bluetooth/hci_vhci.c:69 hci_dev_do_reset net/bluetooth/hci_core.c:578 [inline] hci_dev_reset+0x374/0x534 net/bluetooth/hci_core.c:618 hci_sock_ioctl+0x444/0x82c net/bluetooth/hci_sock.c:1079 sock_do_ioctl+0x134/0x2dc net/socket.c:1204 sock_ioctl+0x4f0/0x85c net/socket.c:1321 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 6986: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] vhci_open+0x64/0x32c drivers/bluetooth/hci_vhci.c:543 misc_open+0x2f0/0x368 drivers/char/misc.c:143 chrdev_open+0x3e8/0x4fc fs/char_dev.c:414 do_dentry_open+0x734/0xfa0 fs/open.c:882 vfs_open+0x7c/0x90 fs/open.c:1013 do_open fs/namei.c:3626 [inline] path_openat+0x1e14/0x2548 fs/namei.c:3783 do_filp_open+0x1bc/0x3cc fs/namei.c:3810 do_sys_openat2+0x128/0x3e0 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1345 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Freed by task 7696: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674 kfree+0xcc/0x1b8 mm/slab_common.c:988 vhci_release+0xb0/0xcc drivers/bluetooth/hci_vhci.c:579 __fput+0x1c8/0x7c8 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x240/0x2f0 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0x550/0x1a84 kernel/exit.c:871 do_group_exit+0x194/0x22c kernel/exit.c:1021 get_signal+0x143c/0x1528 kernel/signal.c:2871 do_signal arch/arm64/kernel/signal.c:1076 [inline] do_notify_resume+0x388/0x2cb8 arch/arm64/kernel/signal.c:1129 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] asm_exit_to_user_mode+0x70/0x84 arch/arm64/kernel/entry-common.c:149 ret_from_fork+0x1c/0x20 arch/arm64/kernel/entry.S:867 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 kvfree_call_rcu+0xb4/0x714 kernel/rcu/tree.c:3401 neigh_destroy+0x470/0x6b0 net/core/neighbour.c:918 neigh_release include/net/neighbour.h:447 [inline] neigh_cleanup_and_release+0x15c/0x414 net/core/neighbour.c:103 neigh_del net/core/neighbour.c:225 [inline] neigh_remove_one+0x320/0x428 net/core/neighbour.c:246 neigh_forced_gc net/core/neighbour.c:279 [inline] neigh_alloc net/core/neighbour.c:485 [inline] ___neigh_create+0x4c0/0x25fc net/core/neighbour.c:648 __neigh_create+0x44/0x58 net/core/neighbour.c:737 ip6_finish_output2+0x19e4/0x1bc0 net/ipv6/ip6_output.c:129 __ip6_finish_output net/ipv6/ip6_output.c:205 [inline] ip6_finish_output+0x5a4/0x940 net/ipv6/ip6_output.c:216 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip6_output+0x274/0x594 net/ipv6/ip6_output.c:237 dst_output include/net/dst.h:453 [inline] NF_HOOK include/linux/netfilter.h:302 [inline] ndisc_send_skb+0xcb0/0x18a0 net/ipv6/ndisc.c:513 ndisc_send_rs+0x3b8/0x4e0 net/ipv6/ndisc.c:723 addrconf_rs_timer+0x300/0x58c net/ipv6/addrconf.c:3982 call_timer_fn+0x1c0/0xa1c kernel/time/timer.c:1504 expire_timers kernel/time/timer.c:1549 [inline] __run_timers+0x554/0x718 kernel/time/timer.c:1820 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1833 handle_softirqs+0x318/0xd58 kernel/softirq.c:578 __do_softirq+0x14/0x20 kernel/softirq.c:612 The buggy address belongs to the object at ffff0000dad9d800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 136 bytes inside of 1024-byte region [ffff0000dad9d800, ffff0000dad9dc00) The buggy address belongs to the physical page: page:00000000ef73032c refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11ad98 head:00000000ef73032c order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 dead000000000100 dead000000000122 ffff0000c0002780 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000dad9d780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000dad9d800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000dad9d880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000dad9d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000dad9d980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Bluetooth: hci0: Opcode 0x0c03 failed: -22