CVE-2022-48878

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

Bluetooth: hci_qca: Fix driver shutdown on closed serdev

The driver shutdown callback (which sends EDL_SOC_RESET to the device

over serdev) should not be invoked when HCI device is not open (e.g. if

hci_dev_open_sync() failed), because the serdev and its TTY are not open

either. Also skip this step if device is powered off

(qca_power_shutdown()).

The shutdown callback causes use-after-free during system reboot with

Qualcomm Atheros Bluetooth:

Unable to handle kernel paging request at virtual address

0072662f67726fd7

...

CPU: 6 PID: 1 Comm: systemd-shutdow Tainted: G W

6.1.0-rt5-00325-g8a5f56bcfcca #8

Hardware name: Qualcomm Technologies, Inc. Robotics RB5 (DT)

Call trace:

tty_driver_flush_buffer+0x4/0x30

serdev_device_write_flush+0x24/0x34

qca_serdev_shutdown+0x80/0x130 [hci_uart]

device_shutdown+0x15c/0x260

kernel_restart+0x48/0xac

KASAN report:

BUG: KASAN: use-after-free in tty_driver_flush_buffer+0x1c/0x50

Read of size 8 at addr ffff16270c2e0018 by task systemd-shutdow/1

CPU: 7 PID: 1 Comm: systemd-shutdow Not tainted

6.1.0-next-20221220-00014-gb85aaf97fb01-dirty #28

Hardware name: Qualcomm Technologies, Inc. Robotics RB5 (DT)

Call trace:

dump_backtrace.part.0+0xdc/0xf0

show_stack+0x18/0x30

dump_stack_lvl+0x68/0x84

print_report+0x188/0x488

kasan_report+0xa4/0xf0

__asan_load8+0x80/0xac

tty_driver_flush_buffer+0x1c/0x50

ttyport_write_flush+0x34/0x44

serdev_device_write_flush+0x48/0x60

qca_serdev_shutdown+0x124/0x274

device_shutdown+0x1e8/0x350

kernel_restart+0x48/0xb0

__do_sys_reboot+0x244/0x2d0

__arm64_sys_reboot+0x54/0x70

invoke_syscall+0x60/0x190

el0_svc_common.constprop.0+0x7c/0x160

do_el0_svc+0x44/0xf0

el0_svc+0x2c/0x6c

el0t_64_sync_handler+0xbc/0x140

el0t_64_sync+0x190/0x194