==================================================================
BUG: KFENCE: use-after-free read in hci_send_acl+0x3e/0x1050 net/bluetooth/hci_core.c:3231

Use-after-free read at 0xffff88823bca2018 (in kfence-#80):
 hci_send_acl+0x3e/0x1050 net/bluetooth/hci_core.c:3231
 l2cap_send_cmd+0x6dd/0x920 net/bluetooth/l2cap_core.c:977
 l2cap_send_conn_req+0x1e5/0x260 net/bluetooth/l2cap_core.c:1286
 l2cap_start_connection+0x11e/0x420 net/bluetooth/l2cap_core.c:1514
 l2cap_conn_start+0x7ae/0xa40 net/bluetooth/l2cap_core.c:1661
 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784
 kthread+0x33c/0x440 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

kfence-#80: 0xffff88823bca2000-0xffff88823bca207f, size=128, cache=kmalloc-128

allocated by task 9460 on cpu 1 at 282.367782s:
 kfence_alloc include/linux/kfence.h:129 [inline]
 slab_alloc_node mm/slub.c:3464 [inline]
 __kmem_cache_alloc_node+0x24e/0x340 mm/slub.c:3517
 kmalloc_trace+0x25/0xe0 mm/slab_common.c:1117
 kmalloc include/linux/slab.h:599 [inline]
 kzalloc include/linux/slab.h:720 [inline]
 hci_chan_create+0xa6/0x3d0 net/bluetooth/hci_conn.c:2723
 l2cap_conn_add.part.0+0x1a/0xdf0 net/bluetooth/l2cap_core.c:7841
 l2cap_conn_add include/net/bluetooth/hci_core.h:1521 [inline]
 l2cap_chan_connect+0x15de/0x2170 net/bluetooth/l2cap_core.c:8053
 l2cap_sock_connect+0x33f/0x720 net/bluetooth/l2cap_sock.c:256
 kernel_connect+0x103/0x170 net/socket.c:3599
 rfcomm_session_create net/bluetooth/rfcomm/core.c:811 [inline]
 __rfcomm_dlc_open net/bluetooth/rfcomm/core.c:388 [inline]
 rfcomm_dlc_open+0x81f/0xaa0 net/bluetooth/rfcomm/core.c:431
 rfcomm_sock_connect+0x430/0x640 net/bluetooth/rfcomm/sock.c:409
 __sys_connect_file+0x15b/0x1a0 net/socket.c:2050
 __sys_connect+0x145/0x170 net/socket.c:2067
 __do_sys_connect net/socket.c:2077 [inline]
 __se_sys_connect net/socket.c:2074 [inline]
 __x64_sys_connect+0x72/0xb0 net/socket.c:2074
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

freed by task 51 on cpu 0 at 294.264659s:
 hci_chan_list_flush+0x81/0xf0 net/bluetooth/hci_conn.c:2763
 hci_conn_cleanup net/bluetooth/hci_conn.c:152 [inline]
 hci_conn_del+0x201/0xd80 net/bluetooth/hci_conn.c:1156
 hci_abort_conn_sync+0x573/0xe10 net/bluetooth/hci_sync.c:5428
 abort_conn_sync+0x187/0x390 net/bluetooth/hci_conn.c:2910
 hci_cmd_sync_work+0x1a4/0x410 net/bluetooth/hci_sync.c:306
 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784
 kthread+0x33c/0x440 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

CPU: 0 PID: 9 Comm: kworker/0:1 Not tainted 6.6.0-rc6-syzkaller-01725-gd6e48462e88f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Workqueue: events l2cap_info_timeout
RIP: 0010:hci_send_acl+0x3e/0x1050 net/bluetooth/hci_core.c:3231
Code: 89 d5 53 48 89 f3 48 83 ec 70 e8 4d e4 49 f8 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 71 0e 00 00 <49> 8b 46 18 48 8d b8 58 0a 00 00 48 89 44 24 10 48 b8 00 00 00 00
RSP: 0018:ffffc900000e79b8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff888076e14280 RCX: 0000000000000000
RDX: 1ffff11047794403 RSI: ffffffff893e0113 RDI: ffff88823bca2000
RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000000080
R10: 0000000000000001 R11: ffffffff81ddeec1 R12: ffff88823bca2018
R13: 0000000000000002 R14: ffff88823bca2000 R15: ffffc900000e7af4
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88823bca2018 CR3: 00000000273e6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 l2cap_send_cmd+0x6dd/0x920 net/bluetooth/l2cap_core.c:977
 l2cap_send_conn_req+0x1e5/0x260 net/bluetooth/l2cap_core.c:1286
 l2cap_start_connection+0x11e/0x420 net/bluetooth/l2cap_core.c:1514
 l2cap_conn_start+0x7ae/0xa40 net/bluetooth/l2cap_core.c:1661
 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784
 kthread+0x33c/0x440 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
==================================================================
----------------
Code disassembly (best guess):
   0:	89 d5                	mov    %edx,%ebp
   2:	53                   	push   %rbx
   3:	48 89 f3             	mov    %rsi,%rbx
   6:	48 83 ec 70          	sub    $0x70,%rsp
   a:	e8 4d e4 49 f8       	call   0xf849e45c
   f:	4c 89 e2             	mov    %r12,%rdx
  12:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  19:	fc ff df
  1c:	48 c1 ea 03          	shr    $0x3,%rdx
  20:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  24:	0f 85 71 0e 00 00    	jne    0xe9b
* 2a:	49 8b 46 18          	mov    0x18(%r14),%rax <-- trapping instruction
  2e:	48 8d b8 58 0a 00 00 	lea    0xa58(%rax),%rdi
  35:	48 89 44 24 10       	mov    %rax,0x10(%rsp)
  3a:	48                   	rex.W
  3b:	b8 00 00 00 00       	mov    $0x0,%eax