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BUG: KASAN: use-after-free in reiserfs_release_objectid+0x430/0x614 fs/reiserfs/objectid.c:165
Read of size 8188 at addr ffff0000f7f44050 by task syz.2.131/5199

CPU: 0 PID: 5199 Comm: syz.2.131 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0x100 mm/kasan/report.c:524
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x260/0x2a0 mm/kasan/generic.c:189
 memmove+0x48/0x90 mm/kasan/shadow.c:54
 reiserfs_release_objectid+0x430/0x614 fs/reiserfs/objectid.c:165
 remove_save_link+0x21c/0x320 fs/reiserfs/super.c:542
 reiserfs_evict_inode+0x2fc/0x3e8 fs/reiserfs/inode.c:91
 evict+0x3c8/0x810 fs/inode.c:705
 iput_final fs/inode.c:1834 [inline]
 iput+0x764/0x7f4 fs/inode.c:1860
 dentry_unlink_inode+0x360/0x438 fs/dcache.c:405
 __dentry_kill+0x320/0x598 fs/dcache.c:611
 dentry_kill+0xc8/0x248 fs/dcache.c:-1
 dput+0x238/0x454 fs/dcache.c:918
 __fput+0x480/0x7c0 fs/file_table.c:328
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1ec/0x270 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0x54c/0x19a8 kernel/exit.c:880
 do_group_exit+0x194/0x22c kernel/exit.c:1022
 get_signal+0x11d0/0x1310 kernel/signal.c:2871
 do_signal arch/arm64/kernel/signal.c:1081 [inline]
 do_notify_resume+0x340/0x2b0c arch/arm64/kernel/signal.c:1134
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x98/0x138 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the physical page:
page:000000001136558d refcount:2 mapcount:0 mapping:000000008e9de46f index:0x10 pfn:0x137f44
memcg:ffff0000cd4be000
aops:def_blk_aops ino:700002
flags: 0x5ffd60000022056(referenced|uptodate|lru|workingset|private|mappedtodisk|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffd60000022056 fffffc00038caf88 fffffc000394e948 ffff0000c058d510
raw: 0000000000000010 ffff0000f5f73740 00000002ffffffff ffff0000cd4be000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f7f44f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000f7f44f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000f7f45000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff0000f7f45080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000f7f45100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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