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BUG: KASAN: use-after-free in reiserfs_release_objectid+0x454/0x63c fs/reiserfs/objectid.c:165
Read of size 8188 at addr ffff0000dfa73050 by task syz.0.5/4116

CPU: 0 PID: 4116 Comm: syz.0.5 Not tainted 5.15.177-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x174/0x1e4 mm/kasan/report.c:451
 kasan_check_range+0x274/0x2b4 mm/kasan/generic.c:189
 memmove+0x90/0xe8 mm/kasan/shadow.c:54
 reiserfs_release_objectid+0x454/0x63c 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:622
 iput_final fs/inode.c:1744 [inline]
 iput+0x744/0x824 fs/inode.c:1770
 dentry_unlink_inode+0x37c/0x4bc fs/dcache.c:380
 __dentry_kill+0x324/0x5e4 fs/dcache.c:586
 dentry_kill+0xc8/0x250
 dput+0x21c/0x458 fs/dcache.c:893
 __fput+0x494/0x800 fs/file_table.c:288
 ____fput+0x20/0x30 fs/file_table.c:308
 task_work_run+0x130/0x1e4 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 do_notify_resume+0x262c/0x32b8 arch/arm64/kernel/signal.c:946
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline]
 el0_svc+0xfc/0x1f0 arch/arm64/kernel/entry-common.c:609
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the page:
page:0000000051f2c84b refcount:2 mapcount:0 mapping:00000000b3063cce index:0x10 pfn:0x11fa73
memcg:ffff0000d7ef8000
aops:def_blk_aops ino:700000
flags: 0x5ffc00000022036(referenced|uptodate|lru|active|private|mappedtodisk|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000022036 fffffc00037e9c88 fffffc00037a8188 ffff0000c0495b08
raw: 0000000000000010 ffff0000de06de80 00000002ffffffff ffff0000d7ef8000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000dfa74f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000dfa74f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000dfa75000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff0000dfa75080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000dfa75100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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