REISERFS warning (device loop0): jdm-13090 reiserfs_new_inode: ACLs aren't enabled in the fs, but vfs thinks they are!
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
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BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x650/0xa0c fs/reiserfs/lbalance.c:-1
Read of size 48 at addr ffff0000e305eff0 by task syz-executor.0/4492

CPU: 1 PID: 4492 Comm: syz-executor.0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x78/0x30c mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xec/0x15c mm/kasan/report.c:451
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x270/0x2b0 mm/kasan/generic.c:189
 memcpy+0x90/0xe8 mm/kasan/shadow.c:65
 leaf_paste_in_buffer+0x650/0xa0c fs/reiserfs/lbalance.c:-1
 leaf_copy_dir_entries+0x45c/0x788 fs/reiserfs/lbalance.c:108
 leaf_copy_boundary_item+0x888/0x19dc fs/reiserfs/lbalance.c:-1
 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline]
 leaf_move_items+0x694/0xb9c fs/reiserfs/lbalance.c:726
 leaf_shift_left+0xc8/0x3ac fs/reiserfs/lbalance.c:750
 balance_leaf_left fs/reiserfs/do_balan.c:-1 [inline]
 balance_leaf+0xf78/0xd2f4 fs/reiserfs/do_balan.c:1409
 do_balance+0x260/0x778 fs/reiserfs/do_balan.c:1888
 reiserfs_insert_item+0x8a8/0x9f4 fs/reiserfs/stree.c:2261
 reiserfs_get_block+0x1318/0x34b0 fs/reiserfs/inode.c:876
 __block_write_begin_int+0x3e4/0x1588 fs/buffer.c:2012
 __block_write_begin+0x40/0x54 fs/buffer.c:2062
 reiserfs_write_begin+0x3c8/0x654 fs/reiserfs/inode.c:2790
 generic_perform_write+0x204/0x480 mm/filemap.c:3785
 __generic_file_write_iter+0x23c/0x454 mm/filemap.c:3912
 generic_file_write_iter+0xb0/0x1b4 mm/filemap.c:3944
 call_write_iter include/linux/fs.h:2172 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x7c8/0xa2c fs/read_write.c:594
 ksys_write+0x120/0x210 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:656
 __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+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/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:00000000ec879a75 refcount:3 mapcount:0 mapping:000000006fe46339 index:0x214 pfn:0x12305e
memcg:ffff0000c2ed4000
aops:def_blk_aops ino:700000
flags: 0x5ffc00000002022(referenced|active|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000002022 0000000000000000 dead000000000122 ffff0000c058cf48
raw: 0000000000000214 ffff0000dea3d9f8 00000003ffffffff ffff0000c2ed4000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000e305ef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000e305ef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000e305f000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff0000e305f080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e305f100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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