Bluetooth: hci0: command tx timeout
sysfs: cannot create duplicate filename '/devices/virtual/bluetooth/hci0/hci0:201'
CPU: 0 UID: 0 PID: 4675 Comm: kworker/u5:1 Not tainted 6.12.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: hci0 hci_rx_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 sysfs_warn_dup fs/sysfs/dir.c:30 [inline]
 sysfs_create_dir_ns+0x2ce/0x3a0 fs/sysfs/dir.c:63
 create_dir lib/kobject.c:73 [inline]
 kobject_add_internal+0x435/0x8d0 lib/kobject.c:240
 kobject_add_varg lib/kobject.c:374 [inline]
 kobject_add+0x152/0x220 lib/kobject.c:426
 device_add+0x4e5/0xbf0 drivers/base/core.c:3610
 hci_conn_add_sysfs+0xe8/0x200 net/bluetooth/hci_sysfs.c:58
 le_conn_complete_evt+0xc9f/0x12e0 net/bluetooth/hci_event.c:5735
 hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5784
 hci_event_func net/bluetooth/hci_event.c:7440 [inline]
 hci_event_packet+0xa55/0x1540 net/bluetooth/hci_event.c:7495
 hci_rx_work+0x3e8/0xca0 net/bluetooth/hci_core.c:4029
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
kobject: kobject_add_internal failed for hci0:201 with -EEXIST, don't try to register things with the same name in the same directory.
Bluetooth: hci0: failed to register connection device
==================================================================
BUG: KASAN: slab-use-after-free in l2cap_sock_new_connection_cb+0x1f8/0x2b0 net/bluetooth/l2cap_sock.c:1483
Read of size 8 at addr ffff888042fa1580 by task kworker/u5:1/4675

CPU: 0 UID: 0 PID: 4675 Comm: kworker/u5:1 Not tainted 6.12.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: hci0 hci_rx_work
Call Trace:
 <TASK>
 __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:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 l2cap_sock_new_connection_cb+0x1f8/0x2b0 net/bluetooth/l2cap_sock.c:1483
 l2cap_connect_cfm+0x377/0x1220 net/bluetooth/l2cap_core.c:7261
 hci_connect_cfm+0xa2/0x150 include/net/bluetooth/hci_core.h:1960
 le_conn_complete_evt+0xd3e/0x12e0 net/bluetooth/hci_event.c:5758
 hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5784
 hci_event_func net/bluetooth/hci_event.c:7440 [inline]
 hci_event_packet+0xa55/0x1540 net/bluetooth/hci_event.c:7495
 hci_rx_work+0x3e8/0xca0 net/bluetooth/hci_core.c:4029
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Allocated by task 4675:
 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:257 [inline]
 __do_kmalloc_node mm/slub.c:4264 [inline]
 __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4276
 kmalloc_noprof include/linux/slab.h:882 [inline]
 sk_prot_alloc+0xe0/0x210 net/core/sock.c:2170
 sk_alloc+0x38/0x370 net/core/sock.c:2223
 bt_sock_alloc+0x3c/0x340 net/bluetooth/af_bluetooth.c:148
 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1877 [inline]
 l2cap_sock_new_connection_cb+0xe1/0x2b0 net/bluetooth/l2cap_sock.c:1468
 l2cap_connect_cfm+0x377/0x1220 net/bluetooth/l2cap_core.c:7261
 hci_connect_cfm+0xa2/0x150 include/net/bluetooth/hci_core.h:1960
 le_conn_complete_evt+0xd3e/0x12e0 net/bluetooth/hci_event.c:5758
 hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5784
 hci_event_func net/bluetooth/hci_event.c:7440 [inline]
 hci_event_packet+0xa55/0x1540 net/bluetooth/hci_event.c:7495
 hci_rx_work+0x3e8/0xca0 net/bluetooth/hci_core.c:4029
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Freed by task 5329:
 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:579
 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:230 [inline]
 slab_free_hook mm/slub.c:2342 [inline]
 slab_free mm/slub.c:4579 [inline]
 kfree+0x1a0/0x440 mm/slub.c:4727
 sk_prot_free net/core/sock.c:2206 [inline]
 __sk_destruct+0x479/0x5f0 net/core/sock.c:2298
 l2cap_sock_cleanup_listen+0xdd/0x3c0 net/bluetooth/l2cap_sock.c:1448
 l2cap_sock_release+0x5d/0x1d0 net/bluetooth/l2cap_sock.c:1411
 __sock_release net/socket.c:658 [inline]
 sock_close+0xbc/0x240 net/socket.c:1426
 __fput+0x23f/0x880 fs/file_table.c:431
 task_work_run+0x24f/0x310 kernel/task_work.c:239
 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:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x168/0x370 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 ffff888042fa1000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1408 bytes inside of
 freed 2048-byte region [ffff888042fa1000, ffff888042fa1800)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x42fa0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000040 ffff88801ac42000 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000
head: 04fff00000000040 ffff88801ac42000 dead000000000100 dead000000000122
head: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000
head: 04fff00000000003 ffffea00010be801 ffffffffffffffff 0000000000000000
head: ffff888000000008 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5031, tgid 5031 (dhcpcd), ts 38161719088, free_ts 38055778636
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556
 prep_new_page mm/page_alloc.c:1564 [inline]
 get_page_from_freelist+0x3649/0x3790 mm/page_alloc.c:3474
 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4751
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
 alloc_slab_page+0x6a/0x140 mm/slub.c:2412
 allocate_slab+0x5a/0x2f0 mm/slub.c:2578
 new_slab mm/slub.c:2631 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3818
 __slab_alloc+0x58/0xa0 mm/slub.c:3908
 __slab_alloc_node mm/slub.c:3961 [inline]
 slab_alloc_node mm/slub.c:4122 [inline]
 __do_kmalloc_node mm/slub.c:4263 [inline]
 __kmalloc_node_track_caller_noprof+0x281/0x440 mm/slub.c:4283
 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:609
 pskb_expand_head+0x1f0/0x1380 net/core/skbuff.c:2275
 netlink_trim+0x183/0x220 net/netlink/af_netlink.c:1298
 netlink_broadcast_filtered+0x76/0x12a0 net/netlink/af_netlink.c:1504
 nlmsg_multicast_filtered include/net/netlink.h:1125 [inline]
 nlmsg_multicast include/net/netlink.h:1144 [inline]
 nlmsg_notify+0xfb/0x1c0 net/netlink/af_netlink.c:2579
 __dev_notify_flags+0xf7/0x400 net/core/dev.c:8880
 dev_change_flags+0xf0/0x1a0 net/core/dev.c:8922
page last free pid 5110 tgid 5110 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_unref_page+0xdf9/0x1140 mm/page_alloc.c:2657
 discard_slab mm/slub.c:2677 [inline]
 __put_partials+0xeb/0x130 mm/slub.c:3145
 put_cpu_partial+0x17c/0x250 mm/slub.c:3220
 __slab_free+0x2ea/0x3d0 mm/slub.c:4449
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:247 [inline]
 slab_post_alloc_hook mm/slub.c:4085 [inline]
 slab_alloc_node mm/slub.c:4134 [inline]
 __kmalloc_cache_noprof+0x132/0x2c0 mm/slub.c:4290
 kmalloc_noprof include/linux/slab.h:878 [inline]
 tomoyo_print_header security/tomoyo/audit.c:156 [inline]
 tomoyo_init_log+0x1ca/0x2050 security/tomoyo/audit.c:255
 tomoyo_supervisor+0x38a/0x11f0 security/tomoyo/common.c:2089
 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline]
 tomoyo_path_permission+0x243/0x360 security/tomoyo/file.c:587
 tomoyo_path_perm+0x480/0x740 security/tomoyo/file.c:838
 security_inode_getattr+0x130/0x330 security/security.c:2373
 vfs_getattr+0x45/0x430 fs/stat.c:204
 vfs_fstat fs/stat.c:229 [inline]
 vfs_fstatat+0xe4/0x190 fs/stat.c:338
 __do_sys_newfstatat fs/stat.c:505 [inline]
 __se_sys_newfstatat fs/stat.c:499 [inline]
 __x64_sys_newfstatat+0x11d/0x1a0 fs/stat.c:499

Memory state around the buggy address:
 ffff888042fa1480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888042fa1500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888042fa1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888042fa1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888042fa1680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================