KASAN: use-after-free Read in kernfs_add

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KASAN: use-after-free Read in kernfs_add_one kernfs	C	error	inconclusive	39	453d	1384d	0/29	auto-obsoleted due to no activity on 2024/08/14 07:44
linux-6.1	KASAN: use-after-free Read in kernfs_add_one (2)				1	443d	443d	0/3	auto-obsoleted due to no activity on 2024/07/29 04:04
linux-6.1	KASAN: use-after-free Read in kernfs_add_one (3)				1	335d	335d	0/3	auto-obsoleted due to no activity on 2024/11/13 12:08
linux-6.1	KASAN: use-after-free Read in kernfs_add_one (4) origin:upstream missing-backport	C		error	3	19h09m	196d	0/3	upstream: reported C repro on 2024/12/22 11:05
linux-6.1	KASAN: use-after-free Read in kernfs_add_one				1	750d	750d	0/3	auto-obsoleted due to no activity on 2023/09/26 01:13
linux-5.15	KASAN: use-after-free Read in kernfs_add_one				1	646d	646d	0/3	auto-obsoleted due to no activity on 2024/01/09 18:18
upstream	KASAN: slab-use-after-free Read in kernfs_add_one kernfs				6	121d	282d	0/29	auto-obsoleted due to no activity on 2025/06/15 10:44

usb 1-1: Direct firmware load for ueagle-atm/eagleII.fw failed with error -2 usb 1-1: Falling back to sysfs fallback for: ueagle-atm/eagleII.fw ================================================================== BUG: KASAN: use-after-free in kernfs_root fs/kernfs/kernfs-internal.h:48 [inline] BUG: KASAN: use-after-free in kernfs_add_one+0x4e6/0x6c0 fs/kernfs/dir.c:787 Read of size 8 at addr ffff8880618cf2e8 by task kworker/0:1/13 CPU: 0 PID: 13 Comm: kworker/0:1 Not tainted 5.15.185-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events request_firmware_work_func Call Trace: <TASK> dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 kernfs_root fs/kernfs/kernfs-internal.h:48 [inline] kernfs_add_one+0x4e6/0x6c0 fs/kernfs/dir.c:787 kernfs_create_dir_ns+0xda/0x120 fs/kernfs/dir.c:1015 sysfs_create_dir_ns+0x120/0x280 fs/sysfs/dir.c:59 create_dir lib/kobject.c:89 [inline] kobject_add_internal+0x662/0xd00 lib/kobject.c:263 kobject_add_varg lib/kobject.c:398 [inline] kobject_add+0x152/0x210 lib/kobject.c:450 class_dir_create_and_add drivers/base/core.c:2966 [inline] get_device_parent+0x380/0x3f0 drivers/base/core.c:3021 device_add+0x335/0xfb0 drivers/base/core.c:3333 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+0x3e9/0xbc0 drivers/base/firmware_loader/fallback.c:659 _request_firmware+0xc86/0x12b0 drivers/base/firmware_loader/main.c:876 request_firmware_work_func+0xac/0x1b0 drivers/base/firmware_loader/main.c:1127 process_one_work+0x863/0x1000 kernel/workqueue.c:2310 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 </TASK> Allocated by task 13: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x9c/0xd0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x100/0x290 mm/slub.c:3233 kmem_cache_zalloc include/linux/slab.h:725 [inline] __kernfs_new_node+0xd6/0x680 fs/kernfs/dir.c:593 kernfs_new_node+0x148/0x250 fs/kernfs/dir.c:669 kernfs_create_dir_ns+0x40/0x120 fs/kernfs/dir.c:1005 sysfs_create_dir_ns+0x120/0x280 fs/sysfs/dir.c:59 create_dir lib/kobject.c:89 [inline] kobject_add_internal+0x662/0xd00 lib/kobject.c:263 kobject_add_varg lib/kobject.c:398 [inline] kobject_add+0x152/0x210 lib/kobject.c:450 class_dir_create_and_add drivers/base/core.c:2966 [inline] get_device_parent+0x380/0x3f0 drivers/base/core.c:3021 device_add+0x335/0xfb0 drivers/base/core.c:3333 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+0x3e9/0xbc0 drivers/base/firmware_loader/fallback.c:659 _request_firmware+0xc86/0x12b0 drivers/base/firmware_loader/main.c:876 request_firmware_work_func+0xac/0x1b0 drivers/base/firmware_loader/main.c:1127 process_one_work+0x863/0x1000 kernel/workqueue.c:2310 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Freed by task 4366: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0xea/0x170 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kmem_cache_free+0x8f/0x210 mm/slub.c:3515 kernfs_put+0x319/0x490 fs/kernfs/dir.c:547 __kernfs_remove+0x9aa/0xc50 fs/kernfs/dir.c:1393 kernfs_remove+0x1d/0x30 fs/kernfs/dir.c:1406 __kobject_del+0xe1/0x2f0 lib/kobject.c:628 kobject_del+0x41/0x60 lib/kobject.c:651 device_del+0x8f8/0xa70 drivers/base/core.c:3612 usb_disconnect+0x573/0x8a0 drivers/usb/core/hub.c:2285 hub_port_connect drivers/usb/core/hub.c:5311 [inline] hub_port_connect_change drivers/usb/core/hub.c:5607 [inline] port_event drivers/usb/core/hub.c:5753 [inline] hub_event+0x1af8/0x4fa0 drivers/usb/core/hub.c:5835 process_one_work+0x863/0x1000 kernel/workqueue.c:2310 process_scheduled_works kernel/workqueue.c:2373 [inline] worker_thread+0xdca/0x12a0 kernel/workqueue.c:2459 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff8880618cf2b8 which belongs to the cache kernfs_node_cache of size 168 The buggy address is located 48 bytes inside of 168-byte region [ffff8880618cf2b8, ffff8880618cf360) The buggy address belongs to the page: page:ffffea00018633c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x618cf flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 dead000000000100 dead000000000122 ffff8880169e9b40 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 4175, ts 65976982478, free_ts 20652435495 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5474 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1975 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x195/0x290 mm/slub.c:3233 kmem_cache_zalloc include/linux/slab.h:725 [inline] __kernfs_new_node+0xd6/0x680 fs/kernfs/dir.c:593 kernfs_new_node+0x148/0x250 fs/kernfs/dir.c:669 __kernfs_create_file+0x47/0x2e0 fs/kernfs/file.c:985 sysfs_add_file_mode_ns+0x2d4/0x3a0 fs/sysfs/file.c:317 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x489/0xcf0 fs/sysfs/group.c:149 internal_create_groups fs/sysfs/group.c:189 [inline] sysfs_create_groups+0x55/0x120 fs/sysfs/group.c:215 create_dir lib/kobject.c:100 [inline] kobject_add_internal+0x7a5/0xd00 lib/kobject.c:263 kobject_add_varg lib/kobject.c:398 [inline] kobject_init_and_add+0x122/0x190 lib/kobject.c:481 netdev_queue_add_kobject net/core/net-sysfs.c:1666 [inline] netdev_queue_update_kobjects+0x19c/0x3e0 net/core/net-sysfs.c:1711 register_queue_kobjects net/core/net-sysfs.c:1772 [inline] netdev_register_kobject+0x265/0x310 net/core/net-sysfs.c:2018 register_netdevice+0x1019/0x16b0 net/core/dev.c:10397 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x94/0x280 mm/page_alloc.c:3396 free_contig_range+0x96/0xf0 mm/page_alloc.c:9393 destroy_args+0xef/0x8b0 mm/debug_vm_pgtable.c:1018 debug_vm_pgtable+0x318/0x370 mm/debug_vm_pgtable.c:1331 do_one_initcall+0x1ee/0x680 init/main.c:1302 do_initcall_level+0x137/0x1f0 init/main.c:1375 do_initcalls+0x4b/0x90 init/main.c:1391 kernel_init_freeable+0x3ce/0x560 init/main.c:1615 kernel_init+0x19/0x1b0 init/main.c:1506 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff8880618cf180: fb fb fc fc fc fc fc fc fc fc fb fb fb fb fb fb ffff8880618cf200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc >ffff8880618cf280: fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb ^ ffff8880618cf300: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8880618cf380: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb ==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/06/26 17:31	linux-5.15.y	1c700860e8bc	803ce19b	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	KASAN: use-after-free Read in kernfs_add_one

Crashes (1):

Assets (help?)