BUG: KASAN: null-ptr-deref in _raw_spin_lock_bh+0x4c/0xc0

[Sungwoo Kim]

Write of size 4 at addr 0000000000000098 by task kworker/u3:0/76

CPU: 0 PID: 76 Comm: kworker/u3:0 Not tainted 6.1.0-rc2 #129
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014
Workqueue: hci0 hci_rx_work
Call Trace:
 <TASK>
 dump_stack_lvl+0x7b/0xb3
 print_report+0xed/0x200
 ? __virt_addr_valid+0x5c/0x240
 ? kasan_addr_to_slab+0xd/0xa0
 ? _raw_spin_lock_bh+0x4c/0xc0
 kasan_report+0xd3/0x100
 ? _raw_spin_lock_bh+0x4c/0xc0
 kasan_check_range+0x2d3/0x310
 __kasan_check_write+0x14/0x20
 _raw_spin_lock_bh+0x4c/0xc0
 lock_sock_nested+0x3f/0x160
 ? queue_work_on+0x90/0xd0
 l2cap_sock_set_shutdown_cb+0x3d/0x60
 l2cap_disconnect_req+0x1e3/0x2e0
 l2cap_bredr_sig_cmd+0x3d2/0x5ec0
 ? vprintk_emit+0x29b/0x4d0
 ? vprintk_default+0x2b/0x30
 ? vprintk+0xdc/0x100
 ? _printk+0x67/0x85
 ? bt_err+0x7f/0xc0
 ? bt_err+0x9a/0xc0
 l2cap_recv_frame+0x7bc/0x4e10
 ? _printk+0x67/0x85
 ? bt_err+0x7f/0xc0
 ? __wake_up_klogd+0xc4/0xf0
 l2cap_recv_acldata+0x327/0x650
 ? hci_conn_enter_active_mode+0x1b7/0x1f0
 hci_rx_work+0x6b7/0x7c0
 process_one_work+0x461/0xaf0
 worker_thread+0x5f8/0xba0
 kthread+0x1c5/0x200
 ? process_one_work+0xaf0/0xaf0
 ? kthread_blkcg+0x90/0x90
 ret_from_fork+0x1f/0x30
 </TASK>