REISERFS warning (device loop2): vs-13060 reiserfs_update_sd_size: stat data of object [1 2 0x0 SD] (nlink == 1) not found (pos 2)
REISERFS (device loop2): Created .reiserfs_priv - reserved for xattr storage.
REISERFS warning (device loop2): vs-13060 reiserfs_update_sd_size: stat data of object [1 2 0x0 SD] (nlink == 1) not found (pos 2)
REISERFS warning (device loop2): vs-13060 reiserfs_update_sd_size: stat data of object [1 2 0x0 SD] (nlink == 1) not found (pos 1)
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BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x631/0xab0
Read of size 176 at addr ffff88805fcdbfb0 by task syz-executor.2/18930

CPU: 1 PID: 18930 Comm: syz-executor.2 Not tainted 6.1.64-syzkaller #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+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15f/0x4f0 mm/kasan/report.c:395
 kasan_report+0x136/0x160 mm/kasan/report.c:495
 kasan_check_range+0x27f/0x290 mm/kasan/generic.c:189
 memcpy+0x25/0x60 mm/kasan/shadow.c:65
 leaf_paste_in_buffer+0x631/0xab0
 leaf_copy_dir_entries+0x71a/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+0xcd0/0x28a0 fs/reiserfs/lbalance.c:726
 leaf_shift_left+0xba/0x430 fs/reiserfs/lbalance.c:750
 balance_leaf+0x15cd/0x12510 fs/reiserfs/do_balan.c:1409
 do_balance+0x309/0x8f0 fs/reiserfs/do_balan.c:1888
 reiserfs_insert_item+0xb56/0xcb0 fs/reiserfs/stree.c:2261
 reiserfs_get_block+0x20b7/0x5150 fs/reiserfs/inode.c:868
 __block_write_begin_int+0x544/0x1a30 fs/buffer.c:1991
 reiserfs_write_begin+0x249/0x510 fs/reiserfs/inode.c:2775
 generic_perform_write+0x2fc/0x5e0 mm/filemap.c:3808
 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3936
 generic_file_write_iter+0xab/0x310 mm/filemap.c:3968
 call_write_iter include/linux/fs.h:2248 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x7ae/0xba0 fs/read_write.c:584
 ksys_write+0x19c/0x2c0 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fe600c7cae9
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:00007fe601a5d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fe600d9bf80 RCX: 00007fe600c7cae9
RDX: 000000000208e24b RSI: 0000000020000040 RDI: 0000000000000006
RBP: 00007fe600cc847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fe600d9bf80 R15: 00007ffff7cae688
 </TASK>

The buggy address belongs to the physical page:
page:ffffea00017f36c0 refcount:3 mapcount:0 mapping:ffff888148dc5ff8 index:0x214 pfn:0x5fcdb
memcg:ffff88813fe46000
aops:def_blk_aops ino:700002
flags: 0xfff18000002042(referenced|workingset|private|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff18000002042 0000000000000000 dead000000000122 ffff888148dc5ff8
raw: 0000000000000214 ffff8880867400e8 00000003ffffffff ffff88813fe46000
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 18930, tgid 18929 (syz-executor.2), ts 1454259481780, free_ts 1454211300833
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513
 prep_new_page mm/page_alloc.c:2520 [inline]
 get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279
 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5545
 folio_alloc+0x1a/0x50 mm/mempolicy.c:2292
 filemap_alloc_folio+0xda/0x4f0 mm/filemap.c:971
 __filemap_get_folio+0x749/0xe80 mm/filemap.c:1965
 pagecache_get_page+0x28/0x250 mm/folio-compat.c:110
 find_or_create_page include/linux/pagemap.h:613 [inline]
 grow_dev_page fs/buffer.c:946 [inline]
 grow_buffers fs/buffer.c:1011 [inline]
 __getblk_slow fs/buffer.c:1038 [inline]
 __getblk_gfp+0x211/0xa20 fs/buffer.c:1333
 sb_getblk include/linux/buffer_head.h:356 [inline]
 get_empty_nodes+0x8c1/0xd70 fs/reiserfs/fix_node.c:890
 fix_nodes+0x2615/0x8c70 fs/reiserfs/fix_node.c:2662
 reiserfs_insert_item+0xa7a/0xcb0 fs/reiserfs/stree.c:2240
 reiserfs_new_inode+0x11f9/0x1d90 fs/reiserfs/inode.c:2054
 reiserfs_create+0x3e3/0x6e0 fs/reiserfs/namei.c:668
 lookup_open fs/namei.c:3414 [inline]
 open_last_lookups fs/namei.c:3482 [inline]
 path_openat+0x12f1/0x2e60 fs/namei.c:3712
 do_filp_open+0x230/0x480 fs/namei.c:3742
 do_sys_openat2+0x13b/0x500 fs/open.c:1318
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1440 [inline]
 free_pcp_prepare mm/page_alloc.c:1490 [inline]
 free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358
 free_unref_page_list+0x663/0x900 mm/page_alloc.c:3499
 release_pages+0x2836/0x2b40 mm/swap.c:1055
 __pagevec_release+0x80/0xf0 mm/swap.c:1075
 pagevec_release include/linux/pagevec.h:71 [inline]
 folio_batch_release include/linux/pagevec.h:135 [inline]
 shmem_undo_range+0x867/0x2020 mm/shmem.c:946
 shmem_truncate_range mm/shmem.c:1045 [inline]
 shmem_evict_inode+0x265/0xa60 mm/shmem.c:1154
 evict+0x2a4/0x620 fs/inode.c:664
 __dentry_kill+0x436/0x650 fs/dcache.c:607
 dentry_kill+0xbb/0x290
 dput+0x21a/0x470 fs/dcache.c:913
 do_renameat2+0xcca/0x1300 fs/namei.c:4938
 __do_sys_rename fs/namei.c:4982 [inline]
 __se_sys_rename fs/namei.c:4980 [inline]
 __x64_sys_rename+0x82/0x90 fs/namei.c:4980
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88805fcdbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88805fcdbf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88805fcdc000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88805fcdc080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88805fcdc100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================