Bluetooth: hci1: Opcode 0x0406 failed: -4 Bluetooth: hci1: Opcode 0x0406 failed: -4 ================================================================== BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x92/0x190 lib/list_debug.c:62 Read of size 8 at addr ffff8880602ef550 by task syz.5.140/6567 CPU: 1 UID: 0 PID: 6567 Comm: syz.5.140 Not tainted 6.14.0-rc2-next-20250214-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 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:410 [inline] print_report+0x16b/0x5a0 mm/kasan/report.c:510 kasan_report+0x143/0x180 mm/kasan/report.c:623 __list_del_entry_valid_or_report+0x92/0x190 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+0x39/0x250 net/bluetooth/af_bluetooth.c:256 l2cap_sock_teardown_cb+0x176/0x440 net/bluetooth/l2cap_sock.c:1600 l2cap_chan_del+0xb8/0x5d0 net/bluetooth/l2cap_core.c:654 l2cap_conn_del+0x391/0x690 net/bluetooth/l2cap_core.c:1785 l2cap_connect_cfm+0xcc/0x1090 net/bluetooth/l2cap_core.c:7195 hci_connect_cfm include/net/bluetooth/hci_core.h:2051 [inline] hci_conn_failed+0x287/0x400 net/bluetooth/hci_conn.c:1266 hci_abort_conn_sync+0xd27/0x1340 net/bluetooth/hci_sync.c:5588 hci_disconnect_all_sync+0x264/0x460 net/bluetooth/hci_sync.c:5611 hci_suspend_sync+0x41a/0xca0 net/bluetooth/hci_sync.c:6088 hci_suspend_dev+0x2be/0x4c0 net/bluetooth/hci_core.c:2811 hci_suspend_notifier+0xf2/0x2b0 net/bluetooth/hci_core.c:2391 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 notifier_call_chain_robust kernel/notifier.c:120 [inline] blocking_notifier_call_chain_robust+0xe8/0x1e0 kernel/notifier.c:345 pm_notifier_call_chain_robust+0x2c/0x60 kernel/power/main.c:102 snapshot_open+0x19b/0x280 kernel/power/user.c:77 misc_open+0x2cc/0x340 drivers/char/misc.c:179 chrdev_open+0x521/0x600 fs/char_dev.c:414 do_dentry_open+0xdec/0x1960 fs/open.c:956 vfs_open+0x3b/0x370 fs/open.c:1086 do_open fs/namei.c:3838 [inline] path_openat+0x2c9f/0x35b0 fs/namei.c:3997 do_filp_open+0x282/0x4e0 fs/namei.c:4024 do_sys_openat2+0x13f/0x1c0 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1454 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f92a138cde9 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:00007f92a2296038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f92a15a6080 RCX: 00007f92a138cde9 RDX: 00000000001c5100 RSI: 00004000000002c0 RDI: ffffffffffffff9c RBP: 00007f92a140e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f92a15a6080 R15: 00007ffef7f35db8 Allocated by task 6417: 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+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4308 [inline] __kmalloc_noprof+0x285/0x4c0 mm/slub.c:4320 kmalloc_noprof include/linux/slab.h:906 [inline] sk_prot_alloc+0xe0/0x210 net/core/sock.c:2182 sk_alloc+0x38/0x370 net/core/sock.c:2235 bt_sock_alloc+0x3c/0x340 net/bluetooth/af_bluetooth.c:148 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1878 [inline] l2cap_sock_create+0x13d/0x300 net/bluetooth/l2cap_sock.c:1920 bt_sock_create+0x161/0x230 net/bluetooth/af_bluetooth.c:132 __sock_create+0x4c0/0xa30 net/socket.c:1548 sock_create net/socket.c:1606 [inline] __sys_socket_create net/socket.c:1643 [inline] __sys_socket+0x150/0x3c0 net/socket.c:1690 __do_sys_socket net/socket.c:1704 [inline] __se_sys_socket net/socket.c:1702 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1702 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6416: 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:2367 [inline] slab_free mm/slub.c:4623 [inline] kfree+0x196/0x430 mm/slub.c:4816 sk_prot_free net/core/sock.c:2218 [inline] __sk_destruct+0x479/0x5f0 net/core/sock.c:2310 l2cap_sock_release+0x15b/0x1d0 net/bluetooth/l2cap_sock.c:1422 __sock_release net/socket.c:647 [inline] sock_close+0xbc/0x240 net/socket.c:1398 __fput+0x3e9/0x9f0 fs/file_table.c:464 task_work_run+0x24f/0x310 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880602ef000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1360 bytes inside of freed 2048-byte region [ffff8880602ef000, ffff8880602ef800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880602ea000 pfn:0x602e8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801b042000 ffffea000182bc10 ffffea0000d52810 raw: ffff8880602ea000 0000000000080005 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88801b042000 ffffea000182bc10 ffffea0000d52810 head: ffff8880602ea000 0000000000080005 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea000180ba01 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2152, tgid 2152 (kworker/1:2), ts 89146918444, free_ts 25417810414 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1629 prep_new_page mm/page_alloc.c:1637 [inline] get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3555 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4817 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2437 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2601 new_slab mm/slub.c:2654 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3840 __slab_alloc+0x58/0xa0 mm/slub.c:3930 __slab_alloc_node mm/slub.c:4005 [inline] slab_alloc_node mm/slub.c:4166 [inline] __do_kmalloc_node mm/slub.c:4307 [inline] __kmalloc_node_track_caller_noprof+0x2e9/0x4c0 mm/slub.c:4327 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:609 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1331 [inline] mld_newpack+0x17c/0xc70 net/ipv6/mcast.c:1788 add_grhead net/ipv6/mcast.c:1899 [inline] add_grec+0x1492/0x19a0 net/ipv6/mcast.c:2037 mld_send_cr net/ipv6/mcast.c:2163 [inline] mld_ifc_work+0x691/0xd90 net/ipv6/mcast.c:2702 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xabe/0x18e0 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7a9/0x920 kernel/kthread.c:464 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1205 [inline] free_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2738 free_contig_range+0x14c/0x430 mm/page_alloc.c:6755 destroy_args+0x94/0x4b0 mm/debug_vm_pgtable.c:1017 debug_vm_pgtable+0x551/0x590 mm/debug_vm_pgtable.c:1397 do_one_initcall+0x248/0x930 init/main.c:1257 do_initcall_level+0x157/0x210 init/main.c:1319 do_initcalls+0x71/0xd0 init/main.c:1335 kernel_init_freeable+0x430/0x5d0 init/main.c:1567 kernel_init+0x1d/0x2b0 init/main.c:1457 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff8880602ef400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880602ef480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880602ef500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880602ef580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880602ef600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================