Bluetooth: hci0: Injecting HCI hardware error event
Bluetooth: hci4: command tx timeout
==================================================================
BUG: KASAN: slab-use-after-free in l2cap_sock_new_connection_cb+0x208/0x2f0 net/bluetooth/l2cap_sock.c:1528
Read of size 8 at addr ffff8880335847b0 by task kworker/u9:0/60

CPU: 0 UID: 0 PID: 60 Comm: kworker/u9:0 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: hci0 hci_rx_work
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 l2cap_sock_new_connection_cb+0x208/0x2f0 net/bluetooth/l2cap_sock.c:1528
 l2cap_connect_cfm+0x368/0x1560 net/bluetooth/l2cap_core.c:7402
 hci_connect_cfm+0x95/0x140 include/net/bluetooth/hci_core.h:2139
 le_conn_complete_evt+0x1134/0x16b0 net/bluetooth/hci_event.c:5865
 hci_le_conn_complete_evt+0x187/0x470 net/bluetooth/hci_event.c:5891
 hci_event_func net/bluetooth/hci_event.c:7793 [inline]
 hci_event_packet+0x659/0xef0 net/bluetooth/hci_event.c:7847
 hci_rx_work+0x3ee/0x1040 net/bluetooth/hci_core.c:4077
 process_one_work+0xa31/0x1980 kernel/workqueue.c:3320
 process_scheduled_works kernel/workqueue.c:3423 [inline]
 worker_thread+0xba8/0x11e0 kernel/workqueue.c:3509
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 60:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5308 [inline]
 __kmalloc_noprof+0x3e7/0x7b0 mm/slub.c:5320
 kmalloc_noprof include/linux/slab.h:954 [inline]
 sk_prot_alloc+0xe7/0x210 net/core/sock.c:2247
 sk_alloc+0x3a/0x390 net/core/sock.c:2303
 bt_sock_alloc+0x3b/0x310 net/bluetooth/af_bluetooth.c:151
 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1934 [inline]
 l2cap_sock_new_connection_cb+0xf1/0x2f0 net/bluetooth/l2cap_sock.c:1513
 l2cap_connect_cfm+0x368/0x1560 net/bluetooth/l2cap_core.c:7402
 hci_connect_cfm+0x95/0x140 include/net/bluetooth/hci_core.h:2139
 le_conn_complete_evt+0x1134/0x16b0 net/bluetooth/hci_event.c:5865
 hci_le_conn_complete_evt+0x187/0x470 net/bluetooth/hci_event.c:5891
 hci_event_func net/bluetooth/hci_event.c:7793 [inline]
 hci_event_packet+0x659/0xef0 net/bluetooth/hci_event.c:7847
 hci_rx_work+0x3ee/0x1040 net/bluetooth/hci_core.c:4077
 process_one_work+0xa31/0x1980 kernel/workqueue.c:3320
 process_scheduled_works kernel/workqueue.c:3423 [inline]
 worker_thread+0xba8/0x11e0 kernel/workqueue.c:3509
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Freed by task 6585:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2700 [inline]
 slab_free mm/slub.c:6291 [inline]
 kfree+0x1c5/0x6c0 mm/slub.c:6606
 sk_prot_free net/core/sock.c:2286 [inline]
 __sk_destruct+0x74b/0x9d0 net/core/sock.c:2386
 l2cap_sock_cleanup_listen+0xe0/0x440 net/bluetooth/l2cap_sock.c:1490
 l2cap_sock_release+0x6e/0x270 net/bluetooth/l2cap_sock.c:1451
 __sock_release+0xb9/0x250 net/socket.c:726
 sock_close+0x1c/0x30 net/socket.c:1529
 __fput+0x461/0xa70 fs/file_table.c:510
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 get_signal+0x11eb/0x1330 kernel/signal.c:2809
 arch_do_signal_or_restart+0xbc/0x840 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x86/0x4d0 kernel/entry/common.c:98

The buggy address belongs to the object at ffff888033584000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1968 bytes inside of
 freed 2048-byte region [ffff888033584000, ffff888033584800)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888033585000 pfn:0x33580
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x80000000000240(workingset|head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000240 ffff88813fe17000 ffffea0000d26e10 ffff88813fe15c88
raw: ffff888033585000 0000000800080005 00000000f5000000 0000000000000000
head: 0080000000000240 ffff88813fe17000 ffffea0000d26e10 ffff88813fe15c88
head: ffff888033585000 0000000800080005 00000000f5000000 0000000000000000
head: 0080000000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
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 5612, tgid 5612 (syz-executor), ts 78431123883, free_ts 64319440899
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1861
 prep_new_page mm/page_alloc.c:1869 [inline]
 get_page_from_freelist+0x27d6/0x2850 mm/page_alloc.c:3949
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5292
 alloc_slab_page mm/slub.c:3289 [inline]
 allocate_slab+0x74/0x5e0 mm/slub.c:3404
 new_slab mm/slub.c:3447 [inline]
 refill_objects+0x33c/0x3d0 mm/slub.c:7319
 refill_sheaf mm/slub.c:2827 [inline]
 __pcs_replace_empty_main+0x373/0x720 mm/slub.c:4664
 alloc_from_pcs mm/slub.c:4762 [inline]
 slab_alloc_node mm/slub.c:4896 [inline]
 __do_kmalloc_node mm/slub.c:5307 [inline]
 __kmalloc_node_track_caller_noprof+0x60b/0x7e0 mm/slub.c:5420
 kmalloc_reserve net/core/skbuff.c:635 [inline]
 pskb_expand_head+0x230/0x1390 net/core/skbuff.c:2302
 netlink_trim+0x1b3/0x2c0 net/netlink/af_netlink.c:1300
 netlink_broadcast_filtered+0x80/0xea0 net/netlink/af_netlink.c:1513
 nlmsg_multicast_filtered include/net/netlink.h:1165 [inline]
 nlmsg_multicast include/net/netlink.h:1184 [inline]
 nlmsg_notify+0xf0/0x1a0 net/netlink/af_netlink.c:2594
 __dev_notify_flags+0xf2/0x310 net/core/dev.c:9791
 rtnl_configure_link net/core/rtnetlink.c:3630 [inline]
 rtnl_newlink_create+0x657/0xb70 net/core/rtnetlink.c:3874
 __rtnl_newlink net/core/rtnetlink.c:3995 [inline]
 rtnl_newlink+0x166a/0x1bb0 net/core/rtnetlink.c:4110
 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
page last free pid 5489 tgid 5489 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1405 [inline]
 __free_frozen_pages+0x1075/0x11b0 mm/page_alloc.c:2946
 __slab_free+0x252/0x2a0 mm/slub.c:5653
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4582 [inline]
 slab_alloc_node mm/slub.c:4911 [inline]
 kmem_cache_alloc_noprof+0x33b/0x680 mm/slub.c:4918
 vm_area_dup+0x2b/0x670 mm/vma_init.c:123
 dup_mmap+0x8b7/0x1d50 mm/mmap.c:1786
 dup_mm kernel/fork.c:1535 [inline]
 copy_mm+0x13b/0x4a0 kernel/fork.c:1587
 copy_process+0x1f24/0x4450 kernel/fork.c:2265
 kernel_clone+0x2d7/0x940 kernel/fork.c:2723
 __do_sys_clone kernel/fork.c:2864 [inline]
 __se_sys_clone kernel/fork.c:2848 [inline]
 __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2848
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888033584680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888033584700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888033584780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff888033584800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888033584880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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