================================================================== 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+0x2d2/0x300 fs/kernfs/dir.c:1326 Read of size 8 at addr ffff888023a1f3d0 by task kworker/1:17/8973 CPU: 1 PID: 8973 Comm: kworker/1:17 Not tainted 6.5.0-rc3-next-20230726-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Workqueue: events request_firmware_work_func Call Trace: __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+0x2d2/0x300 fs/kernfs/dir.c:1326 kernfs_activate fs/kernfs/dir.c:1381 [inline] kernfs_add_one+0x3b5/0x510 fs/kernfs/dir.c:794 kernfs_create_dir_ns+0x181/0x210 fs/kernfs/dir.c:1046 sysfs_create_dir_ns+0x13b/0x2a0 fs/sysfs/dir.c:59 create_dir lib/kobject.c:65 [inline] kobject_add_internal+0x2c8/0x990 lib/kobject.c:233 kobject_add_varg lib/kobject.c:367 [inline] kobject_add+0x16f/0x240 lib/kobject.c:419 class_dir_create_and_add drivers/base/core.c:3169 [inline] get_device_parent+0x393/0x4e0 drivers/base/core.c:3220 device_add+0x1d8/0x1b40 drivers/base/core.c:3549 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:82 [inline] fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:158 [inline] firmware_fallback_sysfs+0x2e2/0xb90 drivers/base/firmware_loader/fallback.c:234 _request_firmware+0xe5a/0x12a0 drivers/base/firmware_loader/main.c:909 request_firmware_work_func+0xeb/0x240 drivers/base/firmware_loader/main.c:1160 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2603 worker_thread+0x687/0x1110 kernel/workqueue.c:2754 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Allocated by task 8973: 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:186 [inline] slab_post_alloc_hook mm/slab.h:762 [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+0x172/0x3b0 mm/slub.c:3502 kmem_cache_zalloc include/linux/slab.h:710 [inline] __kernfs_new_node+0xd3/0x8a0 fs/kernfs/dir.c:611 kernfs_new_node fs/kernfs/dir.c:675 [inline] kernfs_create_dir_ns+0x9a/0x210 fs/kernfs/dir.c:1036 sysfs_create_dir_ns+0x13b/0x2a0 fs/sysfs/dir.c:59 create_dir lib/kobject.c:65 [inline] kobject_add_internal+0x2c8/0x990 lib/kobject.c:233 kobject_add_varg lib/kobject.c:367 [inline] kobject_add+0x16f/0x240 lib/kobject.c:419 class_dir_create_and_add drivers/base/core.c:3169 [inline] get_device_parent+0x393/0x4e0 drivers/base/core.c:3220 device_add+0x1d8/0x1b40 drivers/base/core.c:3549 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:82 [inline] fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:158 [inline] firmware_fallback_sysfs+0x2e2/0xb90 drivers/base/firmware_loader/fallback.c:234 _request_firmware+0xe5a/0x12a0 drivers/base/firmware_loader/main.c:909 request_firmware_work_func+0xeb/0x240 drivers/base/firmware_loader/main.c:1160 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2603 worker_thread+0x687/0x1110 kernel/workqueue.c:2754 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Freed by task 8779: 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+0x15e/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [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+0xf0/0x490 mm/slub.c:3831 kernfs_put.part.0+0x228/0x490 fs/kernfs/dir.c:565 kernfs_put+0x47/0x50 fs/kernfs/dir.c:539 __kernfs_remove+0x4a8/0x750 fs/kernfs/dir.c:1483 kernfs_remove+0x79/0xa0 fs/kernfs/dir.c:1503 sysfs_remove_dir+0xc5/0x100 fs/sysfs/dir.c:101 __kobject_del+0xe2/0x1f0 lib/kobject.c:597 kobject_del lib/kobject.c:620 [inline] kobject_del+0x3f/0x60 lib/kobject.c:612 device_del+0x665/0xa40 drivers/base/core.c:3823 usb_disconnect+0x517/0x890 drivers/usb/core/hub.c:2279 hub_port_connect drivers/usb/core/hub.c:5261 [inline] hub_port_connect_change drivers/usb/core/hub.c:5566 [inline] port_event drivers/usb/core/hub.c:5726 [inline] hub_event+0x21bd/0x5230 drivers/usb/core/hub.c:5808 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2603 process_scheduled_works kernel/workqueue.c:2670 [inline] worker_thread+0x896/0x1110 kernel/workqueue.c:2756 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 The buggy address belongs to the object at ffff888023a1f3a0 which belongs to the cache kernfs_node_cache of size 168 The buggy address is located 48 bytes inside of freed 168-byte region [ffff888023a1f3a0, ffff888023a1f448) The buggy address belongs to the physical page: page:ffffea00008e87c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23a1f anon flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000200 ffff888014675dc0 0000000000000000 dead000000000001 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 13306, tgid 13303 (syz-executor.2), ts 562427078733, free_ts 562110421718 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1569 prep_new_page mm/page_alloc.c:1576 [inline] get_page_from_freelist+0x10d7/0x31b0 mm/page_alloc.c:3256 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4512 alloc_pages+0x1a9/0x270 mm/mempolicy.c:2279 alloc_slab_page mm/slub.c:1870 [inline] allocate_slab+0x24e/0x380 mm/slub.c:2017 new_slab mm/slub.c:2070 [inline] ___slab_alloc+0x8bc/0x1570 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+0x392/0x3b0 mm/slub.c:3502 kmem_cache_zalloc include/linux/slab.h:710 [inline] __kernfs_new_node+0xd3/0x8a0 fs/kernfs/dir.c:611 kernfs_new_node+0x94/0x110 fs/kernfs/dir.c:675 __kernfs_create_file+0x53/0x340 fs/kernfs/file.c:1047 sysfs_add_file_mode_ns+0x1ff/0x3b0 fs/sysfs/file.c:294 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x31c/0xb40 fs/sysfs/group.c:152 netdev_queue_add_kobject net/core/net-sysfs.c:1700 [inline] netdev_queue_update_kobjects+0x236/0x520 net/core/net-sysfs.c:1746 register_queue_kobjects net/core/net-sysfs.c:1807 [inline] netdev_register_kobject+0x297/0x3f0 net/core/net-sysfs.c:2047 register_netdevice+0xd4c/0x1630 net/core/dev.c:10108 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1160 [inline] free_unref_page_prepare+0x508/0xb90 mm/page_alloc.c:2383 free_unref_page_list+0xe6/0xb30 mm/page_alloc.c:2524 release_pages+0x32a/0x14e0 mm/swap.c:1042 tlb_batch_pages_flush+0x9a/0x190 mm/mmu_gather.c:97 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline] tlb_flush_mmu mm/mmu_gather.c:299 [inline] tlb_finish_mmu+0x14b/0x6f0 mm/mmu_gather.c:391 exit_mmap+0x38b/0xa60 mm/mmap.c:3211 __mmput+0x12a/0x4d0 kernel/fork.c:1356 mmput+0x62/0x70 kernel/fork.c:1378 exit_mm kernel/exit.c:567 [inline] do_exit+0x9b4/0x2a20 kernel/exit.c:861 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024 get_signal+0x23d1/0x27b0 kernel/signal.c:2888 arch_do_signal_or_restart+0x89/0x5f0 arch/x86/kernel/signal.c:308 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff888023a1f280: fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb fb ffff888023a1f300: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff888023a1f380: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb ^ ffff888023a1f400: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc ffff888023a1f480: fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================