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BUG: KASAN: use-after-free in reiserfs_release_objectid+0x2e4/0x614 fs/reiserfs/objectid.c:130
Read of size 8184 at addr ffff0000f7c0105c by task syz.5.773/8620

CPU: 1 PID: 8620 Comm: syz.5.773 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026
Call trace:
 dump_backtrace+0x1c0/0x1ec 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+0xf4/0x15c 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+0xa8/0xfc mm/kasan/report.c:524
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x258/0x290 mm/kasan/generic.c:189
 memmove+0x48/0x90 mm/kasan/shadow.c:54
 reiserfs_release_objectid+0x2e4/0x614 fs/reiserfs/objectid.c:130
 remove_save_link+0x234/0x350 fs/reiserfs/super.c:542
 reiserfs_evict_inode+0x308/0x408 fs/reiserfs/inode.c:91
 evict+0x3e0/0x828 fs/inode.c:705
 iput_final fs/inode.c:1834 [inline]
 iput+0x754/0x7e4 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+0x480/0x7b8 fs/file_table.c:328
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1ec/0x278 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0x550/0x19b0 kernel/exit.c:880
 __do_sys_exit kernel/exit.c:989 [inline]
 __se_sys_exit kernel/exit.c:987 [inline]
 do_group_exit+0x0/0x22c kernel/exit.c:987
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 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:00000000aefa8dac refcount:2 mapcount:0 mapping:00000000f124d062 index:0x10 pfn:0x137c01
memcg:ffff0000d1af8000
aops:def_blk_aops ino:700005
flags: 0x5ffd60000022056(referenced|uptodate|lru|workingset|private|mappedtodisk|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffd60000022056 fffffc0003df0008 fffffc0003874748 ffff0000c04a0810
raw: 0000000000000010 ffff0000e071d910 00000002ffffffff ffff0000d1af8000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f7c01f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000f7c01f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000f7c02000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff0000f7c02080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000f7c02100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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