================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] BUG: KASAN: use-after-free in kernfs_get.part.0+0x17/0x80 fs/kernfs/dir.c:496 Read of size 4 at addr ffff888029255000 by task kworker/0:7/3685 CPU: 0 PID: 3685 Comm: kworker/0:7 Not tainted 5.17.0-rc1-syzkaller-00339-g169387e2aa29 #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/0x336 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:71 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] kernfs_get.part.0+0x17/0x80 fs/kernfs/dir.c:496 kernfs_get+0x1b/0x30 fs/kernfs/dir.c:495 sysfs_get include/linux/sysfs.h:635 [inline] create_dir lib/kobject.c:111 [inline] kobject_add_internal+0x5c3/0xa60 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+0x2a8/0x1ee0 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 Allocated by task 3685: 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+0x202/0x3a0 mm/slub.c:3243 kmem_cache_zalloc include/linux/slab.h:705 [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+0x2a8/0x1ee0 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 3680: 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+0x130/0x160 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+0xd8/0x340 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+0x82c/0xd50 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 ffff888029255000 which belongs to the cache kernfs_node_cache of size 168 The buggy address is located 0 bytes inside of 168-byte region [ffff888029255000, ffff8880292550a8) The buggy address belongs to the page: page:ffffea0000a49540 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29255 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000122 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 3685, ts 482827928937, free_ts 480978707493 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 mm/slub.c:1944 [inline] new_slab+0x28a/0x3b0 mm/slub.c:2004 ___slab_alloc+0x87c/0xe90 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+0x35c/0x3a0 mm/slub.c:3243 kmem_cache_zalloc include/linux/slab.h:705 [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+0x2a8/0x1ee0 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 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_list+0x1a9/0xfa0 mm/page_alloc.c:3441 release_pages+0x317/0x1220 mm/swap.c:980 tlb_batch_pages_flush mm/mmu_gather.c:50 [inline] tlb_flush_mmu_free mm/mmu_gather.c:243 [inline] tlb_flush_mmu mm/mmu_gather.c:250 [inline] tlb_finish_mmu+0x165/0x8c0 mm/mmu_gather.c:341 exit_mmap+0x21b/0x670 mm/mmap.c:3180 __mmput+0x122/0x4b0 kernel/fork.c:1114 mmput+0x56/0x60 kernel/fork.c:1135 exit_mm kernel/exit.c:507 [inline] do_exit+0xa3c/0x2a30 kernel/exit.c:793 do_group_exit+0xd2/0x2f0 kernel/exit.c:935 get_signal+0x4b0/0x28c0 kernel/signal.c:2862 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff888029254f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888029254f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888029255000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888029255080: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc ffff888029255100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================