REISERFS (device loop2): Using tea hash to sort names
REISERFS (device loop2): Created .reiserfs_priv - reserved for xattr storage.
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BUG: KASAN: use-after-free in leaf_paste_entries+0x8d0/0x944 fs/reiserfs/lbalance.c:1351
Read of size 2 at addr ffff0000ee9ec078 by task syz.2.511/6454

CPU: 0 PID: 6454 Comm: syz.2.511 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x174/0x1e4 mm/kasan/report.c:451
 __asan_report_load_n_noabort+0x40/0x4c mm/kasan/report_generic.c:319
 leaf_paste_entries+0x8d0/0x944 fs/reiserfs/lbalance.c:1351
 leaf_copy_dir_entries+0x5dc/0xa04 fs/reiserfs/lbalance.c:119
 leaf_copy_boundary_item+0x8c4/0x1a34 fs/reiserfs/lbalance.c:168
 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline]
 leaf_move_items+0xa0c/0x1f7c fs/reiserfs/lbalance.c:726
 leaf_shift_left+0xc8/0x39c fs/reiserfs/lbalance.c:750
 balance_leaf_when_delete_left fs/reiserfs/do_balan.c:194 [inline]
 balance_leaf_when_delete fs/reiserfs/do_balan.c:272 [inline]
 balance_leaf+0x2a70/0xe860 fs/reiserfs/do_balan.c:1393
 do_balance+0x27c/0x790 fs/reiserfs/do_balan.c:1888
 reiserfs_delete_solid_item+0x8fc/0xee0 fs/reiserfs/stree.c:1462
 remove_save_link+0x260/0x460 fs/reiserfs/super.c:540
 reiserfs_truncate_file+0x4e0/0x6f0 fs/reiserfs/inode.c:2330
 reiserfs_setattr+0x8e8/0xd94 fs/reiserfs/inode.c:3409
 notify_change+0xa34/0xcf8 fs/attr.c:505
 do_truncate+0x1c0/0x28c fs/open.c:65
 do_sys_ftruncate+0x288/0x31c fs/open.c:193
 __do_sys_ftruncate fs/open.c:204 [inline]
 __se_sys_ftruncate fs/open.c:202 [inline]
 __arm64_sys_ftruncate+0x60/0x74 fs/open.c:202
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the page:
page:00000000d2a51277 refcount:0 mapcount:0 mapping:0000000000000000 index:0x100 pfn:0x12e9ec
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffc0003b70248 fffffc0003ba7b48 0000000000000000
raw: 0000000000000100 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000ee9ebf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000ee9ebf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000ee9ec000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                                ^
 ffff0000ee9ec080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000ee9ec100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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