================================================================== BUG: KASAN: use-after-free in kernfs_type include/linux/kernfs.h:290 [inline] BUG: KASAN: use-after-free in kernfs_leftmost_descendant fs/kernfs/dir.c:1230 [inline] BUG: KASAN: use-after-free in kernfs_next_descendant_post+0x1da/0x290 fs/kernfs/dir.c:1261 Read of size 2 at addr ffff8880724fd098 by task kworker/0:5/8359 CPU: 0 PID: 8359 Comm: kworker/0:5 Not tainted 5.15.0-rc5-next-20211015-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+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247 __kasan_report mm/kasan/report.c:433 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:450 kernfs_type include/linux/kernfs.h:290 [inline] kernfs_leftmost_descendant fs/kernfs/dir.c:1230 [inline] kernfs_next_descendant_post+0x1da/0x290 fs/kernfs/dir.c:1261 kernfs_activate+0x3a/0x1d0 fs/kernfs/dir.c:1296 kernfs_add_one+0x368/0x4c0 fs/kernfs/dir.c:766 __kernfs_create_file+0x29c/0x350 fs/kernfs/file.c:1014 sysfs_add_file_mode_ns+0x20f/0x3f0 fs/sysfs/file.c:294 sysfs_merge_group+0x196/0x310 fs/sysfs/group.c:342 dpm_sysfs_add+0x241/0x290 drivers/base/power/sysfs.c:707 device_add+0xac4/0x1ee0 drivers/base/core.c:3351 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:507 [inline] fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:583 [inline] firmware_fallback_sysfs+0x402/0xe70 drivers/base/firmware_loader/fallback.c:659 _request_firmware+0xbe5/0x1060 drivers/base/firmware_loader/main.c:850 request_firmware_work_func+0xdd/0x230 drivers/base/firmware_loader/main.c:1096 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 8359: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3212 [inline] slab_alloc mm/slub.c:3220 [inline] kmem_cache_alloc+0x209/0x390 mm/slub.c:3225 kmem_cache_zalloc include/linux/slab.h:714 [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:985 sysfs_add_file_mode_ns+0x20f/0x3f0 fs/sysfs/file.c:294 sysfs_merge_group+0x196/0x310 fs/sysfs/group.c:342 dpm_sysfs_add+0x241/0x290 drivers/base/power/sysfs.c:707 device_add+0xac4/0x1ee0 drivers/base/core.c:3351 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:507 [inline] fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:583 [inline] firmware_fallback_sysfs+0x402/0xe70 drivers/base/firmware_loader/fallback.c:659 _request_firmware+0xbe5/0x1060 drivers/base/firmware_loader/main.c:850 request_firmware_work_func+0xdd/0x230 drivers/base/firmware_loader/main.c:1096 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Freed by task 8558: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xff/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:1700 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1726 slab_free mm/slub.c:3491 [inline] kmem_cache_free+0x92/0x4e0 mm/slub.c:3507 kernfs_put.part.0+0x2c4/0x540 fs/kernfs/dir.c:539 kernfs_put+0x42/0x50 fs/kernfs/dir.c:513 __kernfs_remove+0x725/0xab0 fs/kernfs/dir.c:1372 kernfs_remove+0x1d/0x30 fs/kernfs/dir.c:1385 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+0x834/0xd60 drivers/base/core.c:3593 usb_disconnect.cold+0x4ba/0x78e drivers/usb/core/hub.c:2251 hub_port_connect drivers/usb/core/hub.c:5199 [inline] hub_port_connect_change drivers/usb/core/hub.c:5488 [inline] port_event drivers/usb/core/hub.c:5634 [inline] hub_event+0x1c9c/0x4330 drivers/usb/core/hub.c:5716 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297 process_scheduled_works kernel/workqueue.c:2360 [inline] worker_thread+0x85c/0x11f0 kernel/workqueue.c:2446 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff8880724fd000 which belongs to the cache kernfs_node_cache of size 168 The buggy address is located 152 bytes inside of 168-byte region [ffff8880724fd000, ffff8880724fd0a8) The buggy address belongs to the page: page:ffffea0001c93f40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x724fd flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 0000000700000001 ffff888010dc5a00 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 6596, ts 238165907845, free_ts 238078078448 prep_new_page mm/page_alloc.c:2416 [inline] get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4147 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5386 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2191 alloc_slab_page mm/slub.c:1770 [inline] allocate_slab mm/slub.c:1907 [inline] new_slab+0x32d/0x4a0 mm/slub.c:1970 ___slab_alloc+0x947/0x1040 mm/slub.c:3001 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3088 slab_alloc_node mm/slub.c:3179 [inline] slab_alloc mm/slub.c:3220 [inline] kmem_cache_alloc+0x363/0x390 mm/slub.c:3225 kmem_cache_zalloc include/linux/slab.h:714 [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:985 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 internal_create_groups.part.0+0x90/0x140 fs/sysfs/group.c:188 internal_create_groups fs/sysfs/group.c:184 [inline] sysfs_create_groups+0x25/0x50 fs/sysfs/group.c:214 create_dir lib/kobject.c:100 [inline] kobject_add_internal+0x583/0xa60 lib/kobject.c:255 kobject_add_varg lib/kobject.c:390 [inline] kobject_init_and_add+0x101/0x160 lib/kobject.c:473 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1336 [inline] free_pcp_prepare+0x373/0x870 mm/page_alloc.c:1387 free_unref_page_prepare mm/page_alloc.c:3307 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3386 __vunmap+0x781/0xb70 mm/vmalloc.c:2632 free_work+0x58/0x70 mm/vmalloc.c:95 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff8880724fcf80: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ffff8880724fd000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880724fd080: fb fb fb fb fb fc fc fc fc fc fc fc fc 00 00 00 ^ ffff8880724fd100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880724fd180: 00 00 fc fc fc fc fc fc fc fc fa fb fb fb fb fb 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