REISERFS (device loop0): journal params: device loop0, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using tea hash to sort names
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
==================================================================
BUG: KASAN: use-after-free in leaf_paste_entries+0xe78/0x1110 fs/reiserfs/lbalance.c:1351
Read of size 2 at addr ffff88805da9bf08 by task syz.0.17/5945
CPU: 0 PID: 5945 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
<TASK>
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xac/0x220 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
leaf_paste_entries+0xe78/0x1110 fs/reiserfs/lbalance.c:1351
leaf_copy_dir_entries+0x699/0x990 fs/reiserfs/lbalance.c:119
leaf_copy_boundary_item+0xb90/0x2180 fs/reiserfs/lbalance.c:168
leaf_copy_items fs/reiserfs/lbalance.c:551 [inline]
leaf_move_items+0x8b5/0xe90 fs/reiserfs/lbalance.c:726
leaf_shift_left+0xbd/0x450 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+0x1dc1/0x10da0 fs/reiserfs/do_balan.c:1393
do_balance+0x2fe/0x940 fs/reiserfs/do_balan.c:1888
reiserfs_cut_from_item+0x13b2/0x1f10 fs/reiserfs/stree.c:1836
reiserfs_do_truncate+0xa3d/0x1340 fs/reiserfs/stree.c:1971
reiserfs_truncate_file+0x37a/0x7c0 fs/reiserfs/inode.c:2306
reiserfs_setattr+0xc0c/0x11a0 fs/reiserfs/inode.c:3392
notify_change+0xb0d/0xe10 fs/attr.c:499
do_truncate+0x19b/0x220 fs/open.c:66
handle_truncate fs/namei.c:3299 [inline]
do_open fs/namei.c:3644 [inline]
path_openat+0x298c/0x3190 fs/namei.c:3797
do_filp_open+0x1c5/0x3d0 fs/namei.c:3824
do_sys_openat2+0x12c/0x1c0 fs/open.c:1419
do_sys_open fs/open.c:1434 [inline]
__do_sys_openat fs/open.c:1450 [inline]
__se_sys_openat fs/open.c:1445 [inline]
__x64_sys_openat+0x139/0x160 fs/open.c:1445
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4f8cb8f6c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe953a3f38 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f4f8cde5fa0 RCX: 00007f4f8cb8f6c9
RDX: 000000000000275a RSI: 0000200000000000 RDI: ffffffffffffff9c
RBP: 00007f4f8cc11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4f8cde5fa0 R14: 00007f4f8cde5fa0 R15: 0000000000000004
</TASK>
The buggy address belongs to the physical page:
page:ffffea000176a6c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x5da9b
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x8(__GFP_MOVABLE), pid 1, tgid 1 (swapper/0), ts 16646416727, free_ts 17763854916
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
split_map_pages+0x27b/0x4d0 mm/compaction.c:97
isolate_freepages_range+0x3e0/0x430 mm/compaction.c:775
alloc_contig_range+0x5b2/0x860 mm/page_alloc.c:6244
__alloc_contig_pages mm/page_alloc.c:6267 [inline]
alloc_contig_pages+0x47c/0x580 mm/page_alloc.c:6347
debug_vm_pgtable_alloc_huge_page+0xbf/0x110 mm/debug_vm_pgtable.c:1087
init_args+0x724/0x9b0 mm/debug_vm_pgtable.c:1269
debug_vm_pgtable+0xc1/0x410 mm/debug_vm_pgtable.c:1307
do_one_initcall+0x1fd/0x750 init/main.c:1250
do_initcall_level+0x137/0x1f0 init/main.c:1312
do_initcalls+0x69/0xd0 init/main.c:1328
kernel_init_freeable+0x3d2/0x570 init/main.c:1565
kernel_init+0x1d/0x1c0 init/main.c:1455
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1154 [inline]
free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429
free_contig_range+0xa1/0x160 mm/page_alloc.c:6369
destroy_args+0x80/0x850 mm/debug_vm_pgtable.c:1015
debug_vm_pgtable+0x3cc/0x410 mm/debug_vm_pgtable.c:1400
do_one_initcall+0x1fd/0x750 init/main.c:1250
do_initcall_level+0x137/0x1f0 init/main.c:1312
do_initcalls+0x69/0xd0 init/main.c:1328
kernel_init_freeable+0x3d2/0x570 init/main.c:1565
kernel_init+0x1d/0x1c0 init/main.c:1455
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Memory state around the buggy address:
ffff88805da9be00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff88805da9be80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88805da9bf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff88805da9bf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff88805da9c000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================