wifi: ath12k: fix uaf in ath12k_core_init()

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

wifi: ath12k: fix uaf in ath12k_core_init()

When the execution of ath12k_core_hw_group_assign() or

ath12k_core_hw_group_create() fails, the registered notifier chain is not

unregistered properly. Its memory is freed after rmmod, which may trigger

to a use-after-free (UAF) issue if there is a subsequent access to this

notifier chain.

Fixes the issue by calling ath12k_core_panic_notifier_unregister() in

failure cases.

Call trace:

notifier_chain_register+0x4c/0x1f0 (P)

atomic_notifier_chain_register+0x38/0x68

ath12k_core_init+0x50/0x4e8 [ath12k]

ath12k_pci_probe+0x5f8/0xc28 [ath12k]

pci_device_probe+0xbc/0x1a8

really_probe+0xc8/0x3a0

__driver_probe_device+0x84/0x1b0

driver_probe_device+0x44/0x130

__driver_attach+0xcc/0x208

bus_for_each_dev+0x84/0x100

driver_attach+0x2c/0x40

bus_add_driver+0x130/0x260

driver_register+0x70/0x138

__pci_register_driver+0x68/0x80

ath12k_pci_init+0x30/0x68 [ath12k]

ath12k_init+0x28/0x78 [ath12k]

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3