==================================================================
BUG: KASAN: slab-use-after-free in kernfs_root fs/kernfs/kernfs-internal.h:68 [inline]
BUG: KASAN: slab-use-after-free in kernfs_next_descendant_post+0x2d4/0x300 fs/kernfs/dir.c:1330
Read of size 8 at addr ffff88801cd21030 by task kworker/1:6/5254

CPU: 1 PID: 5254 Comm: kworker/1:6 Not tainted 6.7.0-rc8-syzkaller-00024-gac865f00af29 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events request_firmware_work_func
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xc4/0x620 mm/kasan/report.c:475
 kasan_report+0xda/0x110 mm/kasan/report.c:588
 kernfs_root fs/kernfs/kernfs-internal.h:68 [inline]
 kernfs_next_descendant_post+0x2d4/0x300 fs/kernfs/dir.c:1330
 kernfs_activate fs/kernfs/dir.c:1385 [inline]
 kernfs_add_one+0x3b5/0x510 fs/kernfs/dir.c:798
 kernfs_create_dir_ns+0x181/0x210 fs/kernfs/dir.c:1050
 sysfs_create_dir_ns+0x13b/0x2b0 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:73 [inline]
 kobject_add_internal+0x2c8/0x970 lib/kobject.c:238
 kobject_add_varg lib/kobject.c:372 [inline]
 kobject_add+0x16f/0x240 lib/kobject.c:424
 class_dir_create_and_add drivers/base/core.c:3168 [inline]
 get_device_parent+0x393/0x4e0 drivers/base/core.c:3219
 device_add+0x1ae/0x1aa0 drivers/base/core.c:3549
 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:86 [inline]
 fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:162 [inline]
 firmware_fallback_sysfs+0x2e8/0xbd0 drivers/base/firmware_loader/fallback.c:238
 _request_firmware+0xe3a/0x1260 drivers/base/firmware_loader/main.c:910
 request_firmware_work_func+0xeb/0x240 drivers/base/firmware_loader/main.c:1161
 process_one_work+0x886/0x15d0 kernel/workqueue.c:2627
 process_scheduled_works kernel/workqueue.c:2700 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2781
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>

Allocated by task 5254:
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 __kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook mm/slab.h:763 [inline]
 slab_alloc_node mm/slub.c:3478 [inline]
 slab_alloc mm/slub.c:3486 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3493 [inline]
 kmem_cache_alloc+0x15d/0x2f0 mm/slub.c:3502
 kmem_cache_zalloc include/linux/slab.h:711 [inline]
 __kernfs_new_node+0xd3/0x890 fs/kernfs/dir.c:615
 kernfs_new_node fs/kernfs/dir.c:679 [inline]
 kernfs_create_dir_ns+0x9a/0x210 fs/kernfs/dir.c:1040
 sysfs_create_dir_ns+0x13b/0x2b0 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:73 [inline]
 kobject_add_internal+0x2c8/0x970 lib/kobject.c:238
 kobject_add_varg lib/kobject.c:372 [inline]
 kobject_add+0x16f/0x240 lib/kobject.c:424
 class_dir_create_and_add drivers/base/core.c:3168 [inline]
 get_device_parent+0x393/0x4e0 drivers/base/core.c:3219
 device_add+0x1ae/0x1aa0 drivers/base/core.c:3549
 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:86 [inline]
 fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:162 [inline]
 firmware_fallback_sysfs+0x2e8/0xbd0 drivers/base/firmware_loader/fallback.c:238
 _request_firmware+0xe3a/0x1260 drivers/base/firmware_loader/main.c:910
 request_firmware_work_func+0xeb/0x240 drivers/base/firmware_loader/main.c:1161
 process_one_work+0x886/0x15d0 kernel/workqueue.c:2627
 process_scheduled_works kernel/workqueue.c:2700 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2781
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

Freed by task 28:
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1800 [inline]
 slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826
 slab_free mm/slub.c:3809 [inline]
 kmem_cache_free+0xf8/0x350 mm/slub.c:3831
 kernfs_put.part.0+0x22a/0x490 fs/kernfs/dir.c:569
 kernfs_put+0x47/0x50 fs/kernfs/dir.c:543
 __kernfs_remove+0x3ff/0x650 fs/kernfs/dir.c:1487
 kernfs_remove+0x79/0xa0 fs/kernfs/dir.c:1507
 sysfs_remove_dir+0xc5/0x100 fs/sysfs/dir.c:101
 __kobject_del+0xd3/0x1e0 lib/kobject.c:601
 kobject_del lib/kobject.c:624 [inline]
 kobject_del+0x3f/0x60 lib/kobject.c:616
 device_del+0x66d/0xa50 drivers/base/core.c:3834
 usb_disconnect+0x588/0x910 drivers/usb/core/hub.c:2265
 hub_port_connect drivers/usb/core/hub.c:5280 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5580 [inline]
 port_event drivers/usb/core/hub.c:5740 [inline]
 hub_event+0x1db7/0x4e10 drivers/usb/core/hub.c:5822
 process_one_work+0x886/0x15d0 kernel/workqueue.c:2627
 process_scheduled_works kernel/workqueue.c:2700 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2781
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

The buggy address belongs to the object at ffff88801cd21000
 which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 48 bytes inside of
 freed 168-byte region [ffff88801cd21000, ffff88801cd210a8)

The buggy address belongs to the physical page:
page:ffffea0000734840 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1cd21
flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888015277900 ffffea0000991740 dead000000000008
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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 10661, tgid 10661 (syz-executor.3), ts 337882202041, free_ts 335561026992
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1544 [inline]
 get_page_from_freelist+0xa25/0x36d0 mm/page_alloc.c:3312
 __alloc_pages+0x22e/0x2420 mm/page_alloc.c:4568
 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133
 alloc_slab_page mm/slub.c:1870 [inline]
 allocate_slab mm/slub.c:2017 [inline]
 new_slab+0x283/0x3c0 mm/slub.c:2070
 ___slab_alloc+0x979/0x1500 mm/slub.c:3223
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322
 __slab_alloc_node mm/slub.c:3375 [inline]
 slab_alloc_node mm/slub.c:3468 [inline]
 slab_alloc mm/slub.c:3486 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3493 [inline]
 kmem_cache_alloc+0x2dc/0x2f0 mm/slub.c:3502
 kmem_cache_zalloc include/linux/slab.h:711 [inline]
 __kernfs_new_node+0xd3/0x890 fs/kernfs/dir.c:615
 kernfs_new_node+0x94/0x110 fs/kernfs/dir.c:679
 __kernfs_create_file+0x53/0x340 fs/kernfs/file.c:1025
 sysfs_add_file_mode_ns+0x1ff/0x3b0 fs/sysfs/file.c:307
 create_files fs/sysfs/group.c:64 [inline]
 internal_create_group+0x31c/0xb50 fs/sysfs/group.c:152
 netdev_queue_add_kobject net/core/net-sysfs.c:1701 [inline]
 netdev_queue_update_kobjects+0x236/0x520 net/core/net-sysfs.c:1747
 register_queue_kobjects net/core/net-sysfs.c:1808 [inline]
 netdev_register_kobject+0x297/0x3f0 net/core/net-sysfs.c:2048
 register_netdevice+0x1382/0x1da0 net/core/dev.c:10221
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1137 [inline]
 free_unref_page_prepare+0x4fa/0xaa0 mm/page_alloc.c:2347
 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2487
 kasan_depopulate_vmalloc_pte+0x63/0x80 mm/kasan/shadow.c:427
 apply_to_pte_range mm/memory.c:2599 [inline]
 apply_to_pmd_range mm/memory.c:2643 [inline]
 apply_to_pud_range mm/memory.c:2679 [inline]
 apply_to_p4d_range mm/memory.c:2715 [inline]
 __apply_to_page_range+0x57e/0xdb0 mm/memory.c:2749
 kasan_release_vmalloc+0xa8/0xc0 mm/kasan/shadow.c:544
 __purge_vmap_area_lazy+0x8b9/0x2170 mm/vmalloc.c:1770
 drain_vmap_area_work+0x54/0xd0 mm/vmalloc.c:1804
 process_one_work+0x886/0x15d0 kernel/workqueue.c:2627
 process_scheduled_works kernel/workqueue.c:2700 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2781
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

Memory state around the buggy address:
 ffff88801cd20f00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
 ffff88801cd20f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801cd21000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff88801cd21080: fb fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb
 ffff88801cd21100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================