================================================================== BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x8c/0x1b4 lib/list_debug.c:62 Read of size 8 at addr ffff0000f4f2f570 by task syz-executor/10110 CPU: 1 UID: 0 PID: 10110 Comm: syz-executor Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xa8/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0xb0/0x110 mm/kasan/report.c:595 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 __list_del_entry_valid_or_report+0x8c/0x1b4 lib/list_debug.c:62 __list_del_entry_valid include/linux/list.h:132 [inline] __list_del_entry include/linux/list.h:223 [inline] list_del_init include/linux/list.h:295 [inline] bt_accept_unlink+0x40/0x248 net/bluetooth/af_bluetooth.c:259 l2cap_sock_teardown_cb+0x148/0x360 net/bluetooth/l2cap_sock.c:1616 l2cap_chan_del+0xb8/0x470 net/bluetooth/l2cap_core.c:655 l2cap_conn_del+0x2f8/0x5f0 net/bluetooth/l2cap_core.c:1787 l2cap_disconn_cfm+0x90/0xe0 net/bluetooth/l2cap_core.c:7325 hci_disconn_cfm include/net/bluetooth/hci_core.h:2122 [inline] hci_conn_hash_flush+0x108/0x218 net/bluetooth/hci_conn.c:2609 hci_dev_close_sync+0x89c/0x1154 net/bluetooth/hci_sync.c:5308 hci_dev_do_close net/bluetooth/hci_core.c:501 [inline] hci_unregister_dev+0x204/0x4c0 net/bluetooth/hci_core.c:2715 vhci_release+0x12c/0x17c drivers/bluetooth/hci_vhci.c:690 __fput+0x340/0x75c fs/file_table.c:468 ____fput+0x20/0x58 fs/file_table.c:496 task_work_run+0x1dc/0x260 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x524/0x1a14 kernel/exit.c:966 do_group_exit+0x194/0x22c kernel/exit.c:1107 get_signal+0x11dc/0x12f8 kernel/signal.c:3034 arch_do_signal_or_restart+0x274/0x4414 arch/arm64/kernel/signal.c:1619 exit_to_user_mode_loop+0x7c/0x178 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline] el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:725 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Allocated by task 13304: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:77 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:573 poison_kmalloc_redzone mm/kasan/common.c:400 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:417 kasan_kmalloc include/linux/kasan.h:262 [inline] __do_kmalloc_node mm/slub.c:5646 [inline] __kmalloc_noprof+0x3fc/0x728 mm/slub.c:5658 kmalloc_noprof include/linux/slab.h:961 [inline] sk_prot_alloc+0xc4/0x1f0 net/core/sock.c:2239 sk_alloc+0x44/0x3ac net/core/sock.c:2295 pfkey_create+0xcc/0x520 net/key/af_key.c:152 __sock_create+0x43c/0x91c net/socket.c:1605 sock_create net/socket.c:1663 [inline] __sys_socket_create net/socket.c:1700 [inline] __sys_socket+0xd4/0x1c0 net/socket.c:1747 __do_sys_socket net/socket.c:1761 [inline] __se_sys_socket net/socket.c:1759 [inline] __arm64_sys_socket+0x7c/0x94 net/socket.c:1759 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Freed by task 13304: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:77 __kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2539 [inline] slab_free mm/slub.c:6634 [inline] kfree+0x184/0x600 mm/slub.c:6841 sk_prot_free net/core/sock.c:2278 [inline] __sk_destruct+0x514/0x780 net/core/sock.c:2373 sk_destruct net/core/sock.c:2401 [inline] __sk_free+0x320/0x430 net/core/sock.c:2412 sk_free+0x60/0xc8 net/core/sock.c:2423 sock_put include/net/sock.h:1972 [inline] pfkey_release+0x254/0x338 net/key/af_key.c:186 __sock_release net/socket.c:662 [inline] sock_close+0xa0/0x1e4 net/socket.c:1455 __fput+0x340/0x75c fs/file_table.c:468 ____fput+0x20/0x58 fs/file_table.c:496 task_work_run+0x1dc/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xfc/0x178 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline] el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:725 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 The buggy address belongs to the object at ffff0000f4f2f000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1392 bytes inside of freed 2048-byte region [ffff0000f4f2f000, ffff0000f4f2f800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x134f28 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c0002000 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c0002000 0000000000000000 dead000000000001 head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc3d3ca01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f4f2f400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f4f2f480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000f4f2f500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f4f2f580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f4f2f600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== slab kmalloc-2k start ffff0000f4f2f000 pointer offset 1392 size 2048 list_del corruption. prev->next should be ffff0000d9262570, but was 0000000000000000. (prev=ffff0000f4f2f570) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:64! Internal error: Oops - BUG: 00000000f2000800 [#1] SMP Modules linked in: CPU: 1 UID: 0 PID: 10110 Comm: syz-executor Tainted: G B syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __list_del_entry_valid_or_report+0x17c/0x1b4 lib/list_debug.c:62 lr : __list_del_entry_valid_or_report+0x17c/0x1b4 lib/list_debug.c:62 sp : ffff80009bed7370 x29: ffff80009bed7370 x28: 0000000000000003 x27: ffff0000f6f3e00c x26: ffff0000f6f3e000 x25: 1fffe0001ede7c02 x24: dfff800000000000 x23: 1fffe0001e9e5eae x22: dfff800000000000 x21: ffff0000f4f2f570 x20: ffff0000f4f2f570 x19: ffff0000d9262570 x18: 1fffe000337dfe90 x17: 20747562202c3037 x16: ffff800082debe40 x15: 0000000000000001 x14: 1fffe000337dfefa x13: 0000000000000000 x12: 0000000000000000 x11: ffff6000337dfefb x10: 0000000000ff0100 x9 : 6db35dbdbd571600 x8 : 6db35dbdbd571600 x7 : fffffffffffce210 x6 : ffff8000805653c0 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000807d6608 x2 : 0000000000000001 x1 : 0000000100000000 x0 : 000000000000006d Call trace: __list_del_entry_valid_or_report+0x17c/0x1b4 lib/list_debug.c:62 (P) __list_del_entry_valid include/linux/list.h:132 [inline] __list_del_entry include/linux/list.h:223 [inline] list_del_init include/linux/list.h:295 [inline] bt_accept_unlink+0x40/0x248 net/bluetooth/af_bluetooth.c:259 l2cap_sock_teardown_cb+0x148/0x360 net/bluetooth/l2cap_sock.c:1616 l2cap_chan_del+0xb8/0x470 net/bluetooth/l2cap_core.c:655 l2cap_conn_del+0x2f8/0x5f0 net/bluetooth/l2cap_core.c:1787 l2cap_disconn_cfm+0x90/0xe0 net/bluetooth/l2cap_core.c:7325 hci_disconn_cfm include/net/bluetooth/hci_core.h:2122 [inline] hci_conn_hash_flush+0x108/0x218 net/bluetooth/hci_conn.c:2609 hci_dev_close_sync+0x89c/0x1154 net/bluetooth/hci_sync.c:5308 hci_dev_do_close net/bluetooth/hci_core.c:501 [inline] hci_unregister_dev+0x204/0x4c0 net/bluetooth/hci_core.c:2715 vhci_release+0x12c/0x17c drivers/bluetooth/hci_vhci.c:690 __fput+0x340/0x75c fs/file_table.c:468 ____fput+0x20/0x58 fs/file_table.c:496 task_work_run+0x1dc/0x260 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x524/0x1a14 kernel/exit.c:966 do_group_exit+0x194/0x22c kernel/exit.c:1107 get_signal+0x11dc/0x12f8 kernel/signal.c:3034 arch_do_signal_or_restart+0x274/0x4414 arch/arm64/kernel/signal.c:1619 exit_to_user_mode_loop+0x7c/0x178 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline] el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:725 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Code: 910d0000 aa1303e1 aa1503e3 974c6749 (d4210000) ---[ end trace 0000000000000000 ]---