usb 3-1: r8712u: MAC Address from efuse = 00:e0:4c:87:00:00
usb 3-1: r8712u: Loading firmware from "rtlwifi/rtl8712u.bin"
usb 3-1: Direct firmware load for rtlwifi/rtl8712u.bin failed with error -2
usb 3-1: Falling back to sysfs fallback for: rtlwifi/rtl8712u.bin
==================================================================
BUG: KASAN: use-after-free in __list_add_valid+0x36/0xc0 lib/list_debug.c:23
Read of size 8 at addr ffff88801e6672c8 by task kworker/1:3/9369

CPU: 1 PID: 9369 Comm: kworker/1:3 Not tainted 5.14.0-rc3-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:88 [inline]
 dump_stack_lvl+0x1ae/0x29f lib/dump_stack.c:105
 print_address_description+0x66/0x3b0 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report+0x163/0x210 mm/kasan/report.c:436
 __list_add_valid+0x36/0xc0 lib/list_debug.c:23
 __list_add include/linux/list.h:67 [inline]
 list_add include/linux/list.h:86 [inline]
 fw_load_sysfs_fallback+0x110/0x720 drivers/base/firmware_loader/fallback.c:516
 fw_load_from_user_helper+0x242/0x320 drivers/base/firmware_loader/fallback.c:581
 _request_firmware+0x3b4/0x560 drivers/base/firmware_loader/main.c:833
 request_firmware_work_func+0x100/0x250 drivers/base/firmware_loader/main.c:1079
 process_one_work+0x833/0x10c0 kernel/workqueue.c:2276
 worker_thread+0xac1/0x1320 kernel/workqueue.c:2422
 kthread+0x453/0x480 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Allocated by task 11143:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc+0xc4/0xf0 mm/kasan/common.c:513
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 kmem_cache_alloc_trace+0x96/0x340 mm/slub.c:2983
 kmalloc include/linux/slab.h:591 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 smk_fetch security/smack/smack_lsm.c:288 [inline]
 smack_d_instantiate+0x6e2/0xd00 security/smack/smack_lsm.c:3408
 security_d_instantiate+0xa5/0x100 security/security.c:2038
 d_instantiate_new+0x61/0x110 fs/dcache.c:2027
 ext4_add_nondir+0x22b/0x290 fs/ext4/namei.c:2706
 ext4_symlink+0x9ce/0x1000 fs/ext4/namei.c:3535
 vfs_symlink+0x396/0x530 fs/namei.c:4182
 do_symlinkat+0x251/0x510 fs/namei.c:4212
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff88801e667200
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 200 bytes inside of
 256-byte region [ffff88801e667200, ffff88801e667300)
The buggy address belongs to the page:
page:ffffea0000799980 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801e667200 pfn:0x1e666
head:ffffea0000799980 order:1 compound_mapcount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0000811908 ffffea0000d2c388 ffff888011041b40
raw: ffff88801e667200 0000000000100008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3019, ts 7957364073, free_ts 0
 prep_new_page mm/page_alloc.c:2436 [inline]
 get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4169
 __alloc_pages+0x26c/0x5f0 mm/page_alloc.c:5391
 alloc_slab_page mm/slub.c:1688 [inline]
 allocate_slab+0xf1/0x540 mm/slub.c:1828
 new_slab mm/slub.c:1891 [inline]
 new_slab_objects mm/slub.c:2637 [inline]
 ___slab_alloc+0x1cf/0x350 mm/slub.c:2800
 __slab_alloc mm/slub.c:2840 [inline]
 slab_alloc_node mm/slub.c:2922 [inline]
 slab_alloc mm/slub.c:2964 [inline]
 kmem_cache_alloc_trace+0x29d/0x340 mm/slub.c:2981
 kmalloc include/linux/slab.h:591 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 set_kthread_struct kernel/kthread.c:103 [inline]
 kthread+0x11c/0x480 kernel/kthread.c:281
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88801e667180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801e667200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801e667280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff88801e667300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801e667380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================