ASoC: SOF: Intel: hda: Fix UAF when reloading module

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

ASoC: SOF: Intel: hda: Fix UAF when reloading module

hda_generic_machine_select() appends -idisp to the tplg filename by

allocating a new string with devm_kasprintf(), then stores the string

right back into the global variable snd_soc_acpi_intel_hda_machines.

When the module is unloaded, this memory is freed, resulting in a global

variable pointing to freed memory. Reloading the module then triggers

a use-after-free:

BUG: KFENCE: use-after-free read in string+0x48/0xe0

Use-after-free read at 0x00000000967e0109 (in kfence-#99):

string+0x48/0xe0

vsnprintf+0x329/0x6e0

devm_kvasprintf+0x54/0xb0

devm_kasprintf+0x58/0x80

hda_machine_select.cold+0x198/0x17a2 [snd_sof_intel_hda_generic]

sof_probe_work+0x7f/0x600 [snd_sof]

process_one_work+0x17b/0x330

worker_thread+0x2ce/0x3f0

kthread+0xcf/0x100

ret_from_fork+0x31/0x50

ret_from_fork_asm+0x1a/0x30

kfence-#99: 0x00000000198a940f-0x00000000ace47d9d, size=64, cache=kmalloc-64

allocated by task 333 on cpu 8 at 17.798069s (130.453553s ago):

devm_kmalloc+0x52/0x120

devm_kvasprintf+0x66/0xb0

devm_kasprintf+0x58/0x80

hda_machine_select.cold+0x198/0x17a2 [snd_sof_intel_hda_generic]

sof_probe_work+0x7f/0x600 [snd_sof]

process_one_work+0x17b/0x330

worker_thread+0x2ce/0x3f0

kthread+0xcf/0x100

ret_from_fork+0x31/0x50

ret_from_fork_asm+0x1a/0x30

freed by task 1543 on cpu 4 at 141.586686s (6.665010s ago):

release_nodes+0x43/0xb0

devres_release_all+0x90/0xf0

device_unbind_cleanup+0xe/0x70

device_release_driver_internal+0x1c1/0x200

driver_detach+0x48/0x90

bus_remove_driver+0x6d/0xf0

pci_unregister_driver+0x42/0xb0

__do_sys_delete_module+0x1d1/0x310

do_syscall_64+0x82/0x190

entry_SYSCALL_64_after_hwframe+0x76/0x7e

Fix it by copying the match array with devm_kmemdup_array() before we

modify it.