REISERFS (device loop0): Using rupasov hash to sort names
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BUG: KASAN: out-of-bounds in memmove include/linux/fortify-string.h:207 [inline]
BUG: KASAN: out-of-bounds in leaf_paste_entries+0x404/0x910 fs/reiserfs/lbalance.c:1368
Read of size 18446744073709551571 at addr ffff888063a91fe1 by task syz-executor.0/10196

CPU: 1 PID: 10196 Comm: syz-executor.0 Tainted: G        W         5.13.0-rc7-next-20210623-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
 print_address_description.constprop.0.cold+0x6c/0x2d6 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:436
 check_region_inline mm/kasan/generic.c:180 [inline]
 kasan_check_range+0x13d/0x180 mm/kasan/generic.c:186
 memmove+0x20/0x60 mm/kasan/shadow.c:54
 memmove include/linux/fortify-string.h:207 [inline]
 leaf_paste_entries+0x404/0x910 fs/reiserfs/lbalance.c:1368
 balance_leaf_finish_node_paste_dirent fs/reiserfs/do_balan.c:1295 [inline]
 balance_leaf_finish_node_paste fs/reiserfs/do_balan.c:1321 [inline]
 balance_leaf_finish_node fs/reiserfs/do_balan.c:1364 [inline]
 balance_leaf+0x951e/0xd8b0 fs/reiserfs/do_balan.c:1452
 do_balance+0x315/0x810 fs/reiserfs/do_balan.c:1888
 reiserfs_paste_into_item+0x762/0x8e0 fs/reiserfs/stree.c:2138
 reiserfs_add_entry+0x8cb/0xcf0 fs/reiserfs/namei.c:567
 reiserfs_mkdir+0x675/0x980 fs/reiserfs/namei.c:860
 create_privroot fs/reiserfs/xattr.c:889 [inline]
 reiserfs_xattr_init+0x4de/0xb60 fs/reiserfs/xattr.c:1012
 reiserfs_fill_super+0x2166/0x2e00 fs/reiserfs/super.c:2177
 mount_bdev+0x34d/0x410 fs/super.c:1368
 legacy_get_tree+0x105/0x220 fs/fs_context.c:592
 vfs_get_tree+0x89/0x2f0 fs/super.c:1498
 do_new_mount fs/namespace.c:2905 [inline]
 path_mount+0x132a/0x1fa0 fs/namespace.c:3235
 do_mount fs/namespace.c:3248 [inline]
 __do_sys_mount fs/namespace.c:3456 [inline]
 __se_sys_mount fs/namespace.c:3433 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3433
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x467afa
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f91dadf1fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000467afa
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f91dadf2000
RBP: 00007f91dadf2040 R08: 00007f91dadf2040 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f91dadf2000 R15: 0000000020011200

The buggy address belongs to the page:
page:ffffea00018ea440 refcount:2 mapcount:0 mapping:ffff88801add78c8 index:0x2013 pfn:0x63a91
memcg:ffff88814018c000
aops:def_blk_aops ino:700000
flags: 0xfff00000002032(referenced|lru|active|private|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002032 ffffea00018e9748 ffffea00018e97c8 ffff88801add78c8
raw: 0000000000002013 ffff88805badc828 00000002ffffffff ffff88814018c000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 10196, ts 101846341997, free_ts 0
 prep_new_page mm/page_alloc.c:2445 [inline]
 get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4178
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5382
 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244
 __page_cache_alloc mm/filemap.c:1012 [inline]
 __page_cache_alloc+0x303/0x3a0 mm/filemap.c:997
 pagecache_get_page+0x357/0x1790 mm/filemap.c:1930
 find_or_create_page include/linux/pagemap.h:470 [inline]
 grow_dev_page fs/buffer.c:949 [inline]
 grow_buffers fs/buffer.c:1027 [inline]
 __getblk_slow+0x21d/0xb70 fs/buffer.c:1060
 __getblk_gfp+0x70/0x80 fs/buffer.c:1371
 sb_getblk include/linux/buffer_head.h:327 [inline]
 search_by_key+0x3a8/0x3b80 fs/reiserfs/stree.c:651
 reiserfs_read_locked_inode+0x154/0x2160 fs/reiserfs/inode.c:1557
 reiserfs_fill_super+0x18f4/0x2e00 fs/reiserfs/super.c:2081
 mount_bdev+0x34d/0x410 fs/super.c:1368
 legacy_get_tree+0x105/0x220 fs/fs_context.c:592
 vfs_get_tree+0x89/0x2f0 fs/super.c:1498
 do_new_mount fs/namespace.c:2905 [inline]
 path_mount+0x132a/0x1fa0 fs/namespace.c:3235
 do_mount fs/namespace.c:3248 [inline]
 __do_sys_mount fs/namespace.c:3456 [inline]
 __se_sys_mount fs/namespace.c:3433 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3433
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888063a91e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888063a91f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888063a91f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                       ^
 ffff888063a92000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888063a92080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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