Bluetooth: hci_conn: Fix crash on hci_create_cis_sync

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_conn: Fix crash on hci_create_cis_sync

When attempting to connect multiple ISO sockets without using

DEFER_SETUP may result in the following crash:

BUG: KASAN: null-ptr-deref in hci_create_cis_sync+0x18b/0x2b0

Read of size 2 at addr 0000000000000036 by task kworker/u3:1/50

CPU: 0 PID: 50 Comm: kworker/u3:1 Not tainted

6.0.0-rc7-02243-gb84a13ff4eda #4373

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009),

BIOS 1.16.0-1.fc36 04/01/2014

Workqueue: hci0 hci_cmd_sync_work

Call Trace:

<TASK>

dump_stack_lvl+0x19/0x27

kasan_report+0xbc/0xf0

? hci_create_cis_sync+0x18b/0x2b0

hci_create_cis_sync+0x18b/0x2b0

? get_link_mode+0xd0/0xd0

? __ww_mutex_lock_slowpath+0x10/0x10

? mutex_lock+0xe0/0xe0

? get_link_mode+0xd0/0xd0

hci_cmd_sync_work+0x111/0x190

process_one_work+0x427/0x650

worker_thread+0x87/0x750

? process_one_work+0x650/0x650

kthread+0x14e/0x180

? kthread_exit+0x50/0x50

ret_from_fork+0x22/0x30

</TASK>