REISERFS (device loop0): Using r5 hash to sort names
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
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BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x739/0xca0
Read of size 104 at addr ffff888072d5dfd8 by task syz-executor409/5083

CPU: 1 PID: 5083 Comm: syz-executor409 Not tainted 6.1.0-syzkaller-14321-g0a924817d2ed #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x290 lib/dump_stack.c:106
 print_address_description+0x74/0x340 mm/kasan/report.c:306
 print_report+0x107/0x1f0 mm/kasan/report.c:417
 kasan_report+0xcd/0x100 mm/kasan/report.c:517
 kasan_check_range+0x2a7/0x2e0 mm/kasan/generic.c:189
 memcpy+0x25/0x60 mm/kasan/shadow.c:65
 leaf_paste_in_buffer+0x739/0xca0
 leaf_copy_dir_entries+0x6e2/0xbf0 fs/reiserfs/lbalance.c:108
 leaf_copy_boundary_item+0xb7c/0x20f0 fs/reiserfs/lbalance.c:168
 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline]
 leaf_move_items+0xc74/0x1330 fs/reiserfs/lbalance.c:726
 leaf_shift_left+0xb7/0x420 fs/reiserfs/lbalance.c:750
 balance_leaf_left fs/reiserfs/do_balan.c:616 [inline]
 balance_leaf+0x1579/0x123a0 fs/reiserfs/do_balan.c:1409
 do_balance+0x2d6/0x8d0 fs/reiserfs/do_balan.c:1888
 reiserfs_insert_item+0xb54/0xcb0 fs/reiserfs/stree.c:2261
 reiserfs_get_block+0x20a2/0x5180 fs/reiserfs/inode.c:868
 __block_write_begin_int+0x54c/0x1a80 fs/buffer.c:1991
 reiserfs_write_begin+0x247/0x510 fs/reiserfs/inode.c:2775
 generic_cont_expand_simple+0x151/0x250 fs/buffer.c:2347
 reiserfs_setattr+0x642/0x1200 fs/reiserfs/inode.c:3305
 notify_change+0xe50/0x1100 fs/attr.c:482
 do_truncate+0x200/0x2f0 fs/open.c:65
 do_sys_ftruncate+0x2b0/0x350 fs/open.c:193
 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: 0033:0x7fcced3959e9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe158631c8 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fcced3959e9
RDX: 00007fcced3959e9 RSI: 0000000002007ffb RDI: 0000000000000006
RBP: 0000000000000000 R08: 00007ffe158631f0 R09: 00007ffe158631f0
R10: 00007ffe158631f0 R11: 0000000000000246 R12: 00007ffe158631ec
R13: 00007ffe15863220 R14: 00007ffe15863200 R15: 0000000000000003
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001cb5740 refcount:2 mapcount:0 mapping:ffff88801e4949f8 index:0x213 pfn:0x72d5d
memcg:ffff888140148000
aops:def_blk_aops ino:700000
flags: 0xfff00000002032(referenced|lru|active|private|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002032 ffffea0001cb5708 ffffea0000723c88 ffff88801e4949f8
raw: 0000000000000213 ffff888073cfbd98 00000002ffffffff ffff888140148000
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 5083, tgid 5083 (syz-executor409), ts 51341998489, free_ts 13209412147
 prep_new_page mm/page_alloc.c:2531 [inline]
 get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4283
 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549
 folio_alloc+0x1a/0x50 mm/mempolicy.c:2295
 filemap_alloc_folio+0xca/0x2c0 mm/filemap.c:972
 __filemap_get_folio+0x892/0x1250 mm/filemap.c:1966
 pagecache_get_page+0x28/0x250 mm/folio-compat.c:98
 find_or_create_page include/linux/pagemap.h:612 [inline]
 grow_dev_page+0xba/0x920 fs/buffer.c:946
 grow_buffers fs/buffer.c:1011 [inline]
 __getblk_slow fs/buffer.c:1038 [inline]
 __getblk_gfp+0x16c/0x290 fs/buffer.c:1333
 sb_getblk include/linux/buffer_head.h:356 [inline]
 search_by_key+0x406/0x49c0 fs/reiserfs/stree.c:672
 reiserfs_read_locked_inode+0x223/0x2990 fs/reiserfs/inode.c:1549
 reiserfs_fill_super+0x128a/0x24a0 fs/reiserfs/super.c:2071
 mount_bdev+0x26c/0x3a0 fs/super.c:1359
 legacy_get_tree+0xea/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1489
 do_new_mount+0x289/0xad0 fs/namespace.c:3145
 do_mount fs/namespace.c:3488 [inline]
 __do_sys_mount fs/namespace.c:3697 [inline]
 __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1446 [inline]
 free_pcp_prepare+0x751/0x780 mm/page_alloc.c:1496
 free_unref_page_prepare mm/page_alloc.c:3369 [inline]
 free_unref_page+0x19/0x4c0 mm/page_alloc.c:3464
 free_contig_range+0xa3/0x160 mm/page_alloc.c:9485
 destroy_args+0xfe/0x940 mm/debug_vm_pgtable.c:998
 debug_vm_pgtable+0x43d/0x4a0 mm/debug_vm_pgtable.c:1318
 do_one_initcall+0x1d1/0x410 init/main.c:1306
 do_initcall_level+0x168/0x220 init/main.c:1379
 do_initcalls+0x43/0x90 init/main.c:1395
 kernel_init_freeable+0x428/0x5e0 init/main.c:1634
 kernel_init+0x19/0x2b0 init/main.c:1522
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Memory state around the buggy address:
 ffff888072d5df00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888072d5df80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888072d5e000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888072d5e080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888072d5e100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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