==================================================================
BUG: KASAN: use-after-free in kernfs_root fs/kernfs/kernfs-internal.h:48 [inline]
BUG: KASAN: use-after-free in kernfs_add_one+0x4f9/0x550 fs/kernfs/dir.c:766
Read of size 8 at addr ffff8880687db858 by task kworker/1:4/3670

CPU: 1 PID: 3670 Comm: kworker/1:4 Not tainted 5.17.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events request_firmware_work_func
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0x8d/0x336 mm/kasan/report.c:255
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
 kernfs_root fs/kernfs/kernfs-internal.h:48 [inline]
 kernfs_add_one+0x4f9/0x550 fs/kernfs/dir.c:766
 kernfs_create_dir_ns+0x18b/0x220 fs/kernfs/dir.c:1004
 sysfs_create_dir_ns+0x127/0x290 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:89 [inline]
 kobject_add_internal+0x2d2/0xa60 lib/kobject.c:255
 kobject_add_varg lib/kobject.c:390 [inline]
 kobject_add+0x150/0x1c0 lib/kobject.c:442
 class_dir_create_and_add drivers/base/core.c:2942 [inline]
 get_device_parent+0x3d7/0x590 drivers/base/core.c:2997
 device_add+0x2a8/0x1e20 drivers/base/core.c:3326
 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:512 [inline]
 fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:588 [inline]
 firmware_fallback_sysfs+0x402/0xe70 drivers/base/firmware_loader/fallback.c:664
 _request_firmware+0xb97/0xfe0 drivers/base/firmware_loader/main.c:774
 request_firmware_work_func+0xdd/0x230 drivers/base/firmware_loader/main.c:1020
 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
 worker_thread+0x657/0x1110 kernel/workqueue.c:2454
 kthread+0x2e9/0x3a0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Allocated by task 3670:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:436 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
 kasan_slab_alloc include/linux/kasan.h:260 [inline]
 slab_post_alloc_hook mm/slab.h:732 [inline]
 slab_alloc_node mm/slub.c:3230 [inline]
 slab_alloc mm/slub.c:3238 [inline]
 kmem_cache_alloc+0x271/0x4b0 mm/slub.c:3243
 kmem_cache_zalloc include/linux/slab.h:704 [inline]
 __kernfs_new_node+0xd4/0x8b0 fs/kernfs/dir.c:585
 kernfs_new_node fs/kernfs/dir.c:647 [inline]
 kernfs_create_dir_ns+0x9c/0x220 fs/kernfs/dir.c:994
 sysfs_create_dir_ns+0x127/0x290 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:89 [inline]
 kobject_add_internal+0x2d2/0xa60 lib/kobject.c:255
 kobject_add_varg lib/kobject.c:390 [inline]
 kobject_add+0x150/0x1c0 lib/kobject.c:442
 class_dir_create_and_add drivers/base/core.c:2942 [inline]
 get_device_parent+0x3d7/0x590 drivers/base/core.c:2997
 device_add+0x2a8/0x1e20 drivers/base/core.c:3326
 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:512 [inline]
 fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:588 [inline]
 firmware_fallback_sysfs+0x402/0xe70 drivers/base/firmware_loader/fallback.c:664
 _request_firmware+0xb97/0xfe0 drivers/base/firmware_loader/main.c:774
 request_firmware_work_func+0xdd/0x230 drivers/base/firmware_loader/main.c:1020
 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
 worker_thread+0x657/0x1110 kernel/workqueue.c:2454
 kthread+0x2e9/0x3a0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Freed by task 3699:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:45
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:328
 kasan_slab_free include/linux/kasan.h:236 [inline]
 slab_free_hook mm/slub.c:1728 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754
 slab_free mm/slub.c:3509 [inline]
 kmem_cache_free+0xd7/0x370 mm/slub.c:3526
 kernfs_put.part.0+0x2c4/0x540 fs/kernfs/dir.c:539
 kernfs_put+0x42/0x50 fs/kernfs/dir.c:513
 __kernfs_remove+0x7a3/0xb20 fs/kernfs/dir.c:1388
 kernfs_remove+0x6d/0x90 fs/kernfs/dir.c:1403
 sysfs_remove_dir+0xc1/0x100 fs/sysfs/dir.c:101
 __kobject_del+0xe2/0x200 lib/kobject.c:620
 kobject_del lib/kobject.c:643 [inline]
 kobject_del+0x3c/0x60 lib/kobject.c:635
 device_del+0x81c/0xc80 drivers/base/core.c:3603
 usb_disconnect.cold+0x4ba/0x78e drivers/usb/core/hub.c:2254
 hub_port_connect drivers/usb/core/hub.c:5202 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5502 [inline]
 port_event drivers/usb/core/hub.c:5660 [inline]
 hub_event+0x1e39/0x44d0 drivers/usb/core/hub.c:5742
 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
 process_scheduled_works kernel/workqueue.c:2370 [inline]
 worker_thread+0x833/0x1110 kernel/workqueue.c:2456
 kthread+0x2e9/0x3a0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the object at ffff8880687db828
 which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 48 bytes inside of
 168-byte region [ffff8880687db828, ffff8880687db8d0)
The buggy address belongs to the page:
page:ffffea0001a1f6c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x687db
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0001e5ae40 dead000000000003 ffff888010dd3a00
raw: 0000000000000000 0000000080110011 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 3643, ts 113190099637, free_ts 112956909394
 prep_new_page mm/page_alloc.c:2434 [inline]
 get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4165
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5389
 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2271
 alloc_slab_page mm/slub.c:1799 [inline]
 allocate_slab+0x27f/0x3c0 mm/slub.c:1944
 new_slab mm/slub.c:2004 [inline]
 ___slab_alloc+0xbe1/0x12b0 mm/slub.c:3018
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105
 slab_alloc_node mm/slub.c:3196 [inline]
 slab_alloc mm/slub.c:3238 [inline]
 kmem_cache_alloc+0x3cb/0x4b0 mm/slub.c:3243
 kmem_cache_zalloc include/linux/slab.h:704 [inline]
 __kernfs_new_node+0xd4/0x8b0 fs/kernfs/dir.c:585
 kernfs_new_node+0x93/0x120 fs/kernfs/dir.c:647
 __kernfs_create_file+0x51/0x350 fs/kernfs/file.c:987
 sysfs_add_file_mode_ns+0x20f/0x3f0 fs/sysfs/file.c:294
 create_files fs/sysfs/group.c:64 [inline]
 internal_create_group+0x322/0xb10 fs/sysfs/group.c:148
 netdev_queue_add_kobject net/core/net-sysfs.c:1659 [inline]
 netdev_queue_update_kobjects+0x3aa/0x4e0 net/core/net-sysfs.c:1705
 register_queue_kobjects net/core/net-sysfs.c:1766 [inline]
 netdev_register_kobject+0x35a/0x430 net/core/net-sysfs.c:2012
 register_netdevice+0xd9d/0x1580 net/core/dev.c:9667
 veth_newlink+0x405/0xa90 drivers/net/veth.c:1694
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1352 [inline]
 free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1404
 free_unref_page_prepare mm/page_alloc.c:3325 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3404
 __unfreeze_partials+0x320/0x340 mm/slub.c:2536
 qlink_free mm/kasan/quarantine.c:157 [inline]
 qlist_free_all+0x6d/0x160 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446
 kasan_slab_alloc include/linux/kasan.h:260 [inline]
 slab_post_alloc_hook mm/slab.h:732 [inline]
 slab_alloc_node mm/slub.c:3230 [inline]
 slab_alloc mm/slub.c:3238 [inline]
 kmem_cache_alloc_trace+0x258/0x3d0 mm/slub.c:3255
 kmalloc include/linux/slab.h:581 [inline]
 kzalloc include/linux/slab.h:714 [inline]
 kset_create lib/kobject.c:969 [inline]
 kset_create_and_add+0x4b/0x1a0 lib/kobject.c:1012
 register_queue_kobjects net/core/net-sysfs.c:1753 [inline]
 netdev_register_kobject+0x1c6/0x430 net/core/net-sysfs.c:2012
 register_netdevice+0xd9d/0x1580 net/core/dev.c:9667
 veth_newlink+0x59c/0xa90 drivers/net/veth.c:1725
 __rtnl_newlink+0x107c/0x1760 net/core/rtnetlink.c:3483
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3531
 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5596
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494
 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
 netlink_unicast+0x539/0x7e0 net/netlink/af_netlink.c:1343

Memory state around the buggy address:
 ffff8880687db700: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8880687db780: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
>ffff8880687db800: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb
                                                    ^
 ffff8880687db880: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc
 ffff8880687db900: fc fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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