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BUG: KASAN: use-after-free in rtl_fw_do_work+0x407/0x430 drivers/net/wireless/realtek/rtlwifi/core.c:87
Read of size 8 at addr ffff8881c2f0ff38 by task kworker/1:1/21

CPU: 1 PID: 21 Comm: kworker/1:1 Not tainted 5.9.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events request_firmware_work_func
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xf6/0x16e lib/dump_stack.c:118
 print_address_description.constprop.0+0x1c/0x210 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x37/0x7c mm/kasan/report.c:530
 rtl_fw_do_work+0x407/0x430 drivers/net/wireless/realtek/rtlwifi/core.c:87
 request_firmware_work_func+0x126/0x250 drivers/base/firmware_loader/main.c:1001
 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x392/0x470 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

The buggy address belongs to the page:
page:0000000021fbe8f3 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1c2f0f
flags: 0x200000000000000()
raw: 0200000000000000 0000000000000000 ffffea00070bc388 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881c2f0fe00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881c2f0fe80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881c2f0ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                        ^
 ffff8881c2f0ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881c2f10000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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