REISERFS warning (device loop3): vs-13060 reiserfs_update_sd_size: stat data of object [1 2 0x0 SD] (nlink == 1) not found (pos 2)
REISERFS (device loop3): Created .reiserfs_priv - reserved for xattr storage.
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BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x635/0xab0
Read of size 432 at addr ffff88802bebceb0 by task syz-executor.3/9932

CPU: 1 PID: 9932 Comm: syz-executor.3 Not tainted 6.7.0-rc3-syzkaller-00033-g3b47bc037bd4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:475
 kasan_report+0x142/0x170 mm/kasan/report.c:588
 kasan_check_range+0x27e/0x290 mm/kasan/generic.c:187
 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
 leaf_paste_in_buffer+0x635/0xab0
 leaf_copy_dir_entries+0x71e/0xc60 fs/reiserfs/lbalance.c:108
 leaf_copy_boundary_item+0xbbe/0x21b0 fs/reiserfs/lbalance.c:168
 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline]
 leaf_move_items+0xd1a/0x2960 fs/reiserfs/lbalance.c:726
 leaf_shift_left+0xbe/0x430 fs/reiserfs/lbalance.c:750
 balance_leaf_paste_left_whole fs/reiserfs/do_balan.c:560 [inline]
 balance_leaf_paste_left fs/reiserfs/do_balan.c:594 [inline]
 balance_leaf_left fs/reiserfs/do_balan.c:613 [inline]
 balance_leaf+0x3488/0x12510 fs/reiserfs/do_balan.c:1409
 do_balance+0x30d/0x8f0 fs/reiserfs/do_balan.c:1888
 reiserfs_paste_into_item+0x734/0x880 fs/reiserfs/stree.c:2158
 reiserfs_get_block+0x2250/0x5130 fs/reiserfs/inode.c:1069
 __block_write_begin_int+0x54d/0x1ad0 fs/buffer.c:2119
 reiserfs_write_begin+0x24d/0x520 fs/reiserfs/inode.c:2767
 generic_perform_write+0x31b/0x630 mm/filemap.c:3918
 generic_file_write_iter+0xaf/0x310 mm/filemap.c:4039
 call_write_iter include/linux/fs.h:2020 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x792/0xb20 fs/read_write.c:584
 ksys_write+0x1a0/0x2c0 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fb02967cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb0281fe0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fb02979bf80 RCX: 00007fb02967cae9
RDX: 000000000208e24b RSI: 00000000200001c0 RDI: 0000000000000005
RBP: 00007fb0296c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fb02979bf80 R15: 00007ffd2a027298
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0000afaf00 refcount:2 mapcount:0 mapping:ffff888148c82af8 index:0x253 pfn:0x2bebc
memcg:ffff888078322000
aops:def_blk_aops ino:700003
flags: 0xfff00000008124(referenced|lru|active|private|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000008124 ffffea0000aebc88 ffffea000103d608 ffff888148c82af8
raw: 0000000000000253 ffff888084f64ae0 00000002ffffffff ffff888078322000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 9947, tgid 9929 (syz-executor.3), ts 452893665337, free_ts 452890574772
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1544 [inline]
 get_page_from_freelist+0x33ea/0x3570 mm/page_alloc.c:3312
 __alloc_pages+0x255/0x680 mm/page_alloc.c:4568
 alloc_pages_mpol+0x3de/0x640 mm/mempolicy.c:2133
 alloc_pages mm/mempolicy.c:2204 [inline]
 folio_alloc+0x12a/0x330 mm/mempolicy.c:2211
 filemap_alloc_folio+0xde/0x500 mm/filemap.c:974
 __filemap_get_folio+0x431/0xbb0 mm/filemap.c:1918
 grow_dev_page fs/buffer.c:1041 [inline]
 grow_buffers fs/buffer.c:1106 [inline]
 __getblk_slow fs/buffer.c:1133 [inline]
 bdev_getblk+0x246/0x6d0 fs/buffer.c:1429
 __getblk include/linux/buffer_head.h:358 [inline]
 sb_getblk include/linux/buffer_head.h:364 [inline]
 get_empty_nodes+0x719/0xd90 fs/reiserfs/fix_node.c:890
 fix_nodes+0x261b/0x8ce0 fs/reiserfs/fix_node.c:2663
 reiserfs_paste_into_item+0x656/0x880 fs/reiserfs/stree.c:2129
 reiserfs_add_entry+0x9bc/0xd50 fs/reiserfs/namei.c:565
 reiserfs_create+0x528/0x6e0 fs/reiserfs/namei.c:676
 vfs_create+0x234/0x390 fs/namei.c:3179
 do_mknodat+0x447/0x5b0 fs/namei.c:4034
 __do_sys_mknod fs/namei.c:4067 [inline]
 __se_sys_mknod fs/namei.c:4065 [inline]
 __x64_sys_mknod+0x8e/0xa0 fs/namei.c:4065
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1137 [inline]
 free_unref_page_prepare+0x931/0xa60 mm/page_alloc.c:2347
 free_unref_page_list+0x5a0/0x840 mm/page_alloc.c:2533
 release_pages+0x2117/0x2400 mm/swap.c:1042
 __folio_batch_release+0x84/0x100 mm/swap.c:1062
 folio_batch_release include/linux/pagevec.h:83 [inline]
 shmem_undo_range+0x6aa/0x19d0 mm/shmem.c:1004
 shmem_truncate_range mm/shmem.c:1096 [inline]
 shmem_evict_inode+0x29b/0xa60 mm/shmem.c:1224
 evict+0x2a4/0x630 fs/inode.c:666
 __dentry_kill+0x436/0x660 fs/dcache.c:607
 dentry_kill+0xbb/0x290
 dput+0x21e/0x470 fs/dcache.c:913
 __fput+0x60b/0xa10 fs/file_table.c:402
 task_work_run+0x24a/0x300 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0xb1/0x150 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x69/0x2a0 kernel/entry/common.c:296
 do_syscall_64+0x52/0x110 arch/x86/entry/common.c:88

Memory state around the buggy address:
 ffff88802bebcf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88802bebcf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88802bebd000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88802bebd080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88802bebd100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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