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BUG: KASAN: use-after-free in reiserfs_release_objectid+0x468/0x688 fs/reiserfs/objectid.c:165
Read of size 8188 at addr ffff0000f607b050 by task syz.9.574/8009

CPU: 0 PID: 8009 Comm: syz.9.574 Not tainted 6.1.129-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0x174/0x4c0 mm/kasan/report.c:427
 kasan_report+0xd4/0x130 mm/kasan/report.c:531
 kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189
 memmove+0x48/0x90 mm/kasan/shadow.c:54
 reiserfs_release_objectid+0x468/0x688 fs/reiserfs/objectid.c:165
 remove_save_link+0x2a0/0x460 fs/reiserfs/super.c:542
 reiserfs_evict_inode+0x304/0x3f0 fs/reiserfs/inode.c:91
 evict+0x418/0x894 fs/inode.c:705
 iput_final fs/inode.c:1834 [inline]
 iput+0x7c0/0x8a4 fs/inode.c:1860
 dentry_unlink_inode+0x37c/0x4bc fs/dcache.c:405
 __dentry_kill+0x324/0x5e4 fs/dcache.c:611
 dentry_kill+0xc8/0x250
 dput+0x218/0x454 fs/dcache.c:918
 __fput+0x488/0x7c8 fs/file_table.c:328
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x240/0x2f0 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0x550/0x1a84 kernel/exit.c:871
 do_group_exit+0x194/0x22c kernel/exit.c:1021
 get_signal+0x143c/0x1528 kernel/signal.c:2871
 do_signal arch/arm64/kernel/signal.c:1076 [inline]
 do_notify_resume+0x388/0x2cb8 arch/arm64/kernel/signal.c:1129
 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+0x9c/0x168 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:00000000f5738e81 refcount:2 mapcount:0 mapping:0000000028bf28f5 index:0x10 pfn:0x13607b
memcg:ffff0000d3976000
aops:def_blk_aops ino:700009
flags: 0x5ffd6000002205e(referenced|uptodate|dirty|lru|workingset|private|mappedtodisk|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffd6000002205e fffffc0003df1388 fffffc0003daf408 ffff0000c04a3410
raw: 0000000000000010 ffff0000c0627658 00000002ffffffff ffff0000d3976000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f607bf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000f607bf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000f607c000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff0000f607c080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000f607c100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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