CVE-2022-50881: In the Linux kernel, the following vulnerability has been resolved:  wifi: ath9k: Fix use-after-free in ath9k_hif_usb_disconnect()  This patch fixes a use-after-free in ath9k that occurs in ath9k_hif_usb_disconnect() when ath9k_destroy_wmi() is trying to access 'drv_priv' that has already been freed by ieee80211_free_hw(), called by ath9k_htc_hw_deinit(). The patch moves ath9k_destroy_wmi() before ieee80211_free_hw(). Note that urbs from the driver should be killed before freeing 'wmi' with ath9k_destroy_wmi() as their callbacks will access 'wmi'.  Found by a modified version of syzkaller.  ================================================================== BUG: KASAN: use-after-free in ath9k_destroy_wmi+0x38/0x40 Read of size 8 at addr ffff8881069132a0 by task kworker/0:1/7  CPU: 0 PID: 7 Comm: kworker/0:1 Tainted: G O 5.14.0+ #131 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014 Workqueue: usb_hub_wq hub_event Call Trace:  dump_stack_lvl+0x8e/0xd1  print_address_description.constprop.0.cold+0x93/0x334  ? ath9k_destroy_wmi+0x38/0x40  ? ath9k_destroy_wmi+0x38/0x40  kasan_report.cold+0x83/0xdf  ? ath9k_destroy_wmi+0x38/0x40  ath9k_destroy_wmi+0x38/0x40  ath9k_hif_usb_disconnect+0x329/0x3f0  ? ath9k_hif_usb_suspend+0x120/0x120  ? usb_disable_interface+0xfc/0x180  usb_unbind_interface+0x19b/0x7e0  ? usb_autoresume_device+0x50/0x50  device_release_driver_internal+0x44d/0x520  bus_remove_device+0x2e5/0x5a0  device_del+0x5b2/0xe30  ? __device_link_del+0x370/0x370  ? usb_remove_ep_devs+0x43/0x80  ? remove_intf_ep_devs+0x112/0x1a0  usb_disable_device+0x1e3/0x5a0  usb_disconnect+0x267/0x870  hub_event+0x168d/0x3950  ? rcu_read_lock_sched_held+0xa1/0xd0  ? hub_port_debounce+0x2e0/0x2e0  ? check_irq_usage+0x860/0xf20  ? drain_workqueue+0x281/0x360  ? lock_release+0x640/0x640  ? rcu_read_lock_sched_held+0xa1/0xd0  ? rcu_read_lock_bh_held+0xb0/0xb0  ? lockdep_hardirqs_on_prepare+0x273/0x3e0  process_one_work+0x92b/0x1460  ? pwq_dec_nr_in_flight+0x330/0x330  ? rwlock_bug.part.0+0x90/0x90  worker_thread+0x95/0xe00  ? __kthread_parkme+0x115/0x1e0  ? process_one_work+0x1460/0x1460  kthread+0x3a1/0x480  ? set_kthread_struct+0x120/0x120  ret_from_fork+0x1f/0x30  The buggy address belongs to the page: page:ffffea00041a44c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106913 flags: 0x200000000000000(node=0|zone=2) raw: 0200000000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 3, migratetype Unmovable, gfp_mask 0x40dc0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), pid 7, ts 38347963444, free_ts 41399957635  prep_new_page+0x1aa/0x240  get_page_from_freelist+0x159a/0x27c0  __alloc_pages+0x2da/0x6a0  alloc_pages+0xec/0x1e0  kmalloc_order+0x39/0xf0  kmalloc_order_trace+0x19/0x120  __kmalloc+0x308/0x390  wiphy_new_nm+0x6f5/0x1dd0  ieee80211_alloc_hw_nm+0x36d/0x2230  ath9k_htc_probe_device+0x9d/0x1e10  ath9k_htc_hw_init+0x34/0x50  ath9k_hif_usb_firmware_cb+0x25f/0x4e0  request_firmware_work_func+0x131/0x240  process_one_work+0x92b/0x1460  worker_thread+0x95/0xe00  kthread+0x3a1/0x480 page last free stack trace:  free_pcp_prepare+0x3d3/0x7f0  free_unref_page+0x1e/0x3d0  device_release+0xa4/0x240  kobject_put+0x186/0x4c0  put_device+0x20/0x30  ath9k_htc_disconnect_device+0x1cf/0x2c0  ath9k_htc_hw_deinit+0x26/0x30  ath9k_hif_usb_disconnect+0x2d9/0x3f0  usb_unbind_interface+0x19b/0x7e0  device_release_driver_internal+0x44d/0x520  bus_remove_device+0x2e5/0x5a0  device_del+0x5b2/0xe30  usb_disable_device+0x1e3/0x5a0  usb_disconnect+0x267/0x870  hub_event+0x168d/0x3950  process_one_work+0x92b/0x1460  Memory state around the buggy address:  ffff888106913180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ffff888106913200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888 ---truncated---