syzbot

kobject: kobject_add_internal failed for hci5:201 with -EEXIST, don't try to register things with the same name in the same directory.
Bluetooth: hci5: failed to register connection device
==================================================================
BUG: KASAN: slab-use-after-free in l2cap_connect_cfm+0x68b/0x1090 net/bluetooth/l2cap_core.c:7280
Read of size 8 at addr ffff888045633480 by task kworker/u9:1/18590

CPU: 0 UID: 0 PID: 18590 Comm: kworker/u9:1 Not tainted 6.13.0-rc2-syzkaller-00362-g2d8308bf5b67 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
Workqueue: hci5 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:378 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:489
 kasan_report+0x143/0x180 mm/kasan/report.c:602
 l2cap_connect_cfm+0x68b/0x1090 net/bluetooth/l2cap_core.c:7280
 hci_connect_cfm+0x162/0x240 include/net/bluetooth/hci_core.h:2057
 le_conn_complete_evt+0xd3e/0x12e0 net/bluetooth/hci_event.c:5763
 hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5789
 hci_event_func net/bluetooth/hci_event.c:7470 [inline]
 hci_event_packet+0xa55/0x1540 net/bluetooth/hci_event.c:7525
 hci_rx_work+0x3f3/0xdb0 net/bluetooth/hci_core.c:4035
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa66/0x1840 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 18590:
 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]
 __kmalloc_cache_noprof+0x243/0x390 mm/slub.c:4329
 kmalloc_noprof include/linux/slab.h:901 [inline]
 kzalloc_noprof include/linux/slab.h:1037 [inline]
 l2cap_chan_create+0x50/0x760 net/bluetooth/l2cap_core.c:449
 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1888 [inline]
 l2cap_sock_new_connection_cb+0x181/0x2d0 net/bluetooth/l2cap_sock.c:1470
 l2cap_connect_cfm+0x336/0x1090 net/bluetooth/l2cap_core.c:7263
 hci_connect_cfm+0x162/0x240 include/net/bluetooth/hci_core.h:2057
 le_conn_complete_evt+0xd3e/0x12e0 net/bluetooth/hci_event.c:5763
 hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5789
 hci_event_func net/bluetooth/hci_event.c:7470 [inline]
 hci_event_packet+0xa55/0x1540 net/bluetooth/hci_event.c:7525
 hci_rx_work+0x3f3/0xdb0 net/bluetooth/hci_core.c:4035
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa66/0x1840 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 25140:
 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:582
 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:2353 [inline]
 slab_free mm/slub.c:4613 [inline]
 kfree+0x196/0x430 mm/slub.c:4761
 l2cap_sock_cleanup_listen+0xed/0x3c0 net/bluetooth/l2cap_sock.c:1453
 l2cap_sock_release+0x5d/0x1d0 net/bluetooth/l2cap_sock.c:1413
 __sock_release net/socket.c:640 [inline]
 sock_close+0xbc/0x240 net/socket.c:1408
 __fput+0x23c/0xa50 fs/file_table.c:450
 task_work_run+0x24f/0x310 kernel/task_work.c:239
 get_signal+0x15f7/0x1750 kernel/signal.c:2790
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [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+0xce/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 ffff888045633000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1152 bytes inside of
 freed 2048-byte region [ffff888045633000, ffff888045633800)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x45630
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801ac42000 ffffea0001faea00 dead000000000002
raw: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000
head: 00fff00000000040 ffff88801ac42000 ffffea0001faea00 dead000000000002
head: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000
head: 00fff00000000003 ffffea0001158c01 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 18685, tgid 18685 (modprobe), ts 1170209456939, free_ts 1169737168109
 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+0x3651/0x37a0 mm/page_alloc.c:3474
 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4751
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2269
 alloc_slab_page+0x6a/0x110 mm/slub.c:2423
 allocate_slab+0x5a/0x2b0 mm/slub.c:2589
 new_slab mm/slub.c:2642 [inline]
 ___slab_alloc+0xc27/0x14a0 mm/slub.c:3830
 __slab_alloc+0x58/0xa0 mm/slub.c:3920
 __slab_alloc_node mm/slub.c:3995 [inline]
 slab_alloc_node mm/slub.c:4156 [inline]
 __do_kmalloc_node mm/slub.c:4297 [inline]
 __kmalloc_node_track_caller_noprof+0x2e9/0x4c0 mm/slub.c:4317
 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:609
 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:678
 alloc_skb include/linux/skbuff.h:1323 [inline]
 nlmsg_new include/net/netlink.h:1018 [inline]
 audit_buffer_alloc kernel/audit.c:1795 [inline]
 audit_log_start+0x186/0xa30 kernel/audit.c:1913
 common_lsm_audit+0xdd/0x1ce0 security/lsm_audit.c:449
 smack_log+0x421/0x540 security/smack/smack_access.c:383
 smk_tskacc+0x300/0x370 security/smack/smack_access.c:253
 smack_inode_permission+0x2dc/0x380 security/smack/smack_lsm.c:1234
page last free pid 11566 tgid 11566 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_unref_page+0xd2c/0x1000 mm/page_alloc.c:2657
 discard_slab mm/slub.c:2688 [inline]
 __put_partials+0x160/0x1c0 mm/slub.c:3157
 put_cpu_partial+0x17c/0x250 mm/slub.c:3232
 __slab_free+0x290/0x380 mm/slub.c:4483
 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:250 [inline]
 slab_post_alloc_hook mm/slub.c:4119 [inline]
 slab_alloc_node mm/slub.c:4168 [inline]
 kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4175
 vm_area_dup+0x27/0x290 kernel/fork.c:487
 dup_mmap kernel/fork.c:697 [inline]
 dup_mm kernel/fork.c:1695 [inline]
 copy_mm+0xc1d/0x1f90 kernel/fork.c:1744
 copy_process+0x1845/0x3d50 kernel/fork.c:2395
 kernel_clone+0x223/0x870 kernel/fork.c:2807
 __do_sys_clone kernel/fork.c:2950 [inline]
 __se_sys_clone kernel/fork.c:2934 [inline]
 __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2934
 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

Memory state around the buggy address:
 ffff888045633380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888045633400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888045633480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888045633500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888045633580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================