==================================================================
BUG: KASAN: slab-use-after-free in software_node_notify_remove+0xa0/0xcc drivers/base/swnode.c:1106
Read at addr f1f0000004747ec8 by task syz.0.18/3498
Pointer tag: [f1], memory tag: [fe]

CPU: 1 UID: 0 PID: 3498 Comm: syz.0.18 Not tainted 6.15.0-rc1-syzkaller-00065-g3b07108ada81 #0 PREEMPT 
Hardware name: linux,dummy-virt (DT)
Call trace:
 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:466 (C)
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x78/0x90 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0x108/0x630 mm/kasan/report.c:521
 kasan_report+0x88/0xac mm/kasan/report.c:634
 report_tag_fault arch/arm64/mm/fault.c:332 [inline]
 do_tag_recovery arch/arm64/mm/fault.c:344 [inline]
 __do_kernel_fault+0x170/0x1c8 arch/arm64/mm/fault.c:386
 do_bad_area arch/arm64/mm/fault.c:486 [inline]
 do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:843
 do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:919
 el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:432
 el1h_64_sync_handler+
 el1h_64_sync_handler+0xa4/0x120 arch/arm64/kernel/entry-common.c:510
 el1h_64_sync+0x6c/0x70 arch/arm64/kernel/entry.S:595
 software_node_notify_remove+0xa0/0xcc drivers/base/swnode.c:1106 (P)
 device_platform_notify_remove drivers/base/core.c:2387 [inline]
 device_del+0x164/0x384 drivers/base/core.c:3858
 device_unregister+0x18/0x34 drivers/base/core.c:3896
 mock_dev_destroy drivers/iommu/iommufd/selftest.c:960 [inline]
 iommufd_selftest_destroy+0x48/0x58 drivers/iommu/iommufd/selftest.c:1850
 iommufd_fops_release+0x9c/0x158 drivers/iommu/iommufd/main.c:261
 __fput+0xcc/0x2dc fs/file_table.c:465
 ____fput+0x14/0x20 fs/file_table.c:493
 task_work_run+0x78/0xd4 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 do_notify_resume+0x134/0x164 arch/arm64/kernel/entry-common.c:151
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]
 el0_svc+0xc0/0xe0 arch/arm64/kernel/entry-common.c:745
 el0t_64_sync_handler+0x10c/0x138 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:600

Allocated by task 3501:
 kasan_save_stack+0x3c/0x64 mm/kasan/common.c:47
 save_stack_info+0x40/0x158 mm/kasan/tags.c:106
 kasan_save_alloc_info+0x14/0x20 mm/kasan/tags.c:142
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 poison_kmalloc_redzone mm/kasan/common.c:350 [inline]
 __kasan_kmalloc+0xb4/0xb8 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __kmalloc_cache_noprof+0x174/0x390 mm/slub.c:4362
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 swnode_register+0x38/0x1d8 drivers/base/swnode.c:790
 fwnode_create_software_node+0xb4/0x190 drivers/base/swnode.c:949
 device_create_managed_software_node+0x88/0x108 drivers/base/swnode.c:1060
 mock_dev_create drivers/iommu/iommufd/selftest.c:942 [inline]
 iommufd_test_mock_domain drivers/iommu/iommufd/selftest.c:989 [inline]
 iommufd_test+0x24c/0x14d8 drivers/iommu/iommufd/selftest.c:1866
 iommufd_fops_ioctl+0x234/0x2a4 drivers/iommu/iommufd/main.c:419
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl fs/ioctl.c:892 [inline]
 __arm64_sys_ioctl+0xb4/0xe8 fs/ioctl.c:892
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x48/0x110 arch/arm64/kernel/syscall.c:49
 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:151
 el0_svc+0x30/0xe0 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x10c/0x138 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:600

Freed by task 3498:
 kasan_save_stack+0x3c/0x64 mm/kasan/common.c:47
 save_stack_info+0x40/0x158 mm/kasan/tags.c:106
 kasan_save_free_info+0x18/0x24 mm/kasan/tags.c:147
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x74/0x8c mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2389 [inline]
 slab_free mm/slub.c:4646 [inline]
 kfree+0xfc/0x30c mm/slub.c:4845
 software_node_release+0xd0/0xf0 drivers/base/swnode.c:775
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0xa4/0x114 lib/kobject.c:737
 software_node_notify_remove+0xa0/0xcc drivers/base/swnode.c:1106
 device_platform_notify_remove drivers/base/core.c:2387 [inline]
 device_del+0x164/0x384 drivers/base/core.c:3858
 device_unregister+0x18/0x34 drivers/base/core.c:3896
 mock_dev_destroy drivers/iommu/iommufd/selftest.c:960 [inline]
 iommufd_selftest_destroy+0x48/0x58 drivers/iommu/iommufd/selftest.c:1850
 iommufd_fops_release+0x9c/0x158 drivers/iommu/iommufd/main.c:261
 __fput+0xcc/0x2dc fs/file_table.c:465
 ____fput+0x14/0x20 fs/file_table.c:493
 task_work_run+0x78/0xd4 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 do_notify_resume+0x134/0x164 arch/arm64/kernel/entry-common.c:151
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]
 el0_svc+0xc0/0xe0 arch/arm64/kernel/entry-common.c:745
 el0t_64_sync_handler+0x10c/0x138 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:600

The buggy address belongs to the object at fff0000004747e00
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 200 bytes inside of
 256-byte region [fff0000004747e00, fff0000004747f00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xf1f0000004747e00 pfn:0x44747
flags: 0x1ffc00000000000(node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0)
page_type: f5(slab)
raw: 01ffc00000000000 f5f0000003001800 dead000000000122 0000000000000000
raw: f1f0000004747e00 000000008010000f 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 fff0000004747c00: f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 fe fe
 fff0000004747d00: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 fe fe
>fff0000004747e00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
                                                       ^
 fff0000004747f00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
 fff0000004748000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 1 PID: 3498 at lib/refcount.c:28 refcount_warn_saturate+0xf4/0x144 lib/refcount.c:28
Modules linked in:
CPU: 1 UID: 0 PID: 3498 Comm: syz.0.18 Tainted: G    B               6.15.0-rc1-syzkaller-00065-g3b07108ada81 #0 PREEMPT 
Tainted: [B]=BAD_PAGE
Hardware name: linux,dummy-virt (DT)
pstate: 61402009 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
pc : refcount_warn_saturate+0xf4/0x144 lib/refcount.c:28
lr : refcount_warn_saturate+0xf4/0x144 lib/refcount.c:28
sp : ffff8000895d3c50
x29: ffff8000895d3c50 x28: faf00000098cb6c0 x27: 0000000000000000
x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000
x23: 0000000000000000 x22: 0000000000400040 x21: ffff800082a5ac88
x20: fbf0000009885000 x19: f1f0000004747e00 x18: 00000000ffffffff
x17: 0000000000000000 x16: 0000000000000000 x15: ffff8000895d3680
x14: 00000000ffffffea x13: ffff8000895d3a08 x12: ffff8000829a0b88
x11: 0000000000000001 x10: 0000000000000001 x9 : 000000000002ffe8
x8 : c0000000ffffdfff x7 : ffff8000828f0b00 x6 : 00000000000affa8
x5 : ffff8000829a0b30 x4 : 0000000000000000 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000000000000 x0 : faf00000098cb6c0
Call trace:
 refcount_warn_saturate+0xf4/0x144 lib/refcount.c:28 (P)
 __refcount_sub_and_test include/linux/refcount.h:400 [inline]
 __refcount_dec_and_test include/linux/refcount.h:432 [inline]
 refcount_dec_and_test include/linux/refcount.h:450 [inline]
 kref_put include/linux/kref.h:64 [inline]
 kobject_put+0x110/0x114 lib/kobject.c:737
 software_node_notify_remove+0xbc/0xcc drivers/base/swnode.c:1110
 device_platform_notify_remove drivers/base/core.c:2387 [inline]
 device_del+0x164/0x384 drivers/base/core.c:3858
 device_unregister+0x18/0x34 drivers/base/core.c:3896
 mock_dev_destroy drivers/iommu/iommufd/selftest.c:960 [inline]
 iommufd_selftest_destroy+0x48/0x58 drivers/iommu/iommufd/selftest.c:1850
 iommufd_fops_release+0x9c/0x158 drivers/iommu/iommufd/main.c:261
 __fput+0xcc/0x2dc fs/file_table.c:465
 ____fput+0x14/0x20 fs/file_table.c:493
 task_work_run+0x78/0xd4 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 do_notify_resume+0x134/0x164 arch/arm64/kernel/entry-common.c:151
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]
 el0_svc+0xc0/0xe0 arch/arm64/kernel/entry-common.c:745
 el0t_64_sync_handler+0x10c/0x138 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:600
---[ end trace 0000000000000000 ]---