================================================================== 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 ffff0000d6e41558 by task syz.4.193/8298 CPU: 0 UID: 0 PID: 8298 Comm: syz.4.193 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 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:124 [inline] __list_del_entry include/linux/list.h:215 [inline] list_del_init include/linux/list.h:287 [inline] bt_accept_unlink+0x40/0x248 net/bluetooth/af_bluetooth.c:259 l2cap_sock_teardown_cb+0x148/0x360 net/bluetooth/l2cap_sock.c:1613 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:2065 [inline] hci_conn_hash_flush+0x108/0x218 net/bluetooth/hci_conn.c:2564 hci_dev_close_sync+0x89c/0x1154 net/bluetooth/hci_sync.c:5294 hci_dev_do_close net/bluetooth/hci_core.c:501 [inline] hci_unregister_dev+0x204/0x4c0 net/bluetooth/hci_core.c:2715 vhci_release+0x7c/0xd0 drivers/bluetooth/hci_vhci.c:665 __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:961 do_group_exit+0x194/0x22c kernel/exit.c:1102 get_signal+0x11dc/0x12f8 kernel/signal.c:3034 do_signal+0x274/0x4434 arch/arm64/kernel/signal.c:1618 do_notify_resume+0xb0/0x1f4 arch/arm64/kernel/entry-common.c:152 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:173 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:182 [inline] el0_svc+0xb8/0x180 arch/arm64/kernel/entry-common.c:880 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Allocated by task 8529: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:562 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4365 [inline] __kmalloc_noprof+0x2fc/0x4c8 mm/slub.c:4377 kmalloc_noprof include/linux/slab.h:909 [inline] sk_prot_alloc+0xc4/0x1f0 net/core/sock.c:2239 sk_alloc+0x44/0x3ac net/core/sock.c:2295 bt_sock_alloc+0x4c/0x300 net/bluetooth/af_bluetooth.c:151 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1894 [inline] l2cap_sock_create+0x140/0x2d0 net/bluetooth/l2cap_sock.c:1936 bt_sock_create+0x14c/0x24c net/bluetooth/af_bluetooth.c:135 __sock_create+0x43c/0x91c net/socket.c:1589 sock_create net/socket.c:1647 [inline] __sys_socket_create net/socket.c:1684 [inline] __sys_socket+0xd4/0x1c0 net/socket.c:1731 __do_sys_socket net/socket.c:1745 [inline] __se_sys_socket net/socket.c:1743 [inline] __arm64_sys_socket+0x7c/0x94 net/socket.c:1743 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Freed by task 8530: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x74/0x98 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2417 [inline] slab_free mm/slub.c:4680 [inline] kfree+0x17c/0x474 mm/slub.c:4879 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:1960 [inline] l2cap_sock_kill+0x12c/0x234 net/bluetooth/l2cap_sock.c:1265 l2cap_sock_release+0x130/0x1ac net/bluetooth/l2cap_sock.c:1435 __sock_release net/socket.c:649 [inline] sock_close+0xa0/0x1e4 net/socket.c:1439 __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] do_notify_resume+0x174/0x1f4 arch/arm64/kernel/entry-common.c:155 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:173 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:182 [inline] el0_svc+0xb8/0x180 arch/arm64/kernel/entry-common.c:880 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 The buggy address belongs to the object at ffff0000d6e41000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1368 bytes inside of freed 2048-byte region [ffff0000d6e41000, ffff0000d6e41800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff0000d6e44000 pfn:0x116e40 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000240(workingset|head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000240 ffff0000c0002000 fffffdffc31ec010 fffffdffc3595c10 raw: ffff0000d6e44000 0000000000080002 00000000f5000000 0000000000000000 head: 05ffc00000000240 ffff0000c0002000 fffffdffc31ec010 fffffdffc3595c10 head: ffff0000d6e44000 0000000000080002 00000000f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc35b9001 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d6e41400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d6e41480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000d6e41500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d6e41580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d6e41600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================