hpfs: You really don't want any checks? You are crazy...
hpfs: hpfs_map_sector(): read error
hpfs: code page support is disabled
==================================================================
BUG: KASAN: use-after-free in strcmp+0xc0/0xf4 lib/string.c:361
Read of size 1 at addr ffff0000f8e3c8a6 by task syz.0.64/4682

CPU: 1 PID: 4682 Comm: syz.0.64 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0x100 mm/kasan/report.c:524
 __asan_report_load1_noabort+0x2c/0x38 mm/kasan/report_generic.c:348
 strcmp+0xc0/0xf4 lib/string.c:361
 hpfs_get_ea+0xfc/0x968 fs/hpfs/ea.c:139
 hpfs_read_inode+0x15c/0xcac fs/hpfs/inode.c:63
 hpfs_fill_super+0xe64/0x1800 fs/hpfs/super.c:712
 mount_bdev+0x264/0x358 fs/super.c:1443
 hpfs_mount+0x44/0x58 fs/hpfs/super.c:758
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632
 vfs_get_tree+0x90/0x274 fs/super.c:1573
 do_new_mount+0x228/0x810 fs/namespace.c:3078
 path_mount+0x5b4/0xe78 fs/namespace.c:3408
 do_mount fs/namespace.c:3421 [inline]
 __do_sys_mount fs/namespace.c:3629 [inline]
 __se_sys_mount fs/namespace.c:3606 [inline]
 __arm64_sys_mount+0x49c/0x584 fs/namespace.c:3606
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the physical page:
page:000000005364ca6e refcount:2 mapcount:1 mapping:000000009c2f1b82 index:0x8c8 pfn:0x138e3c
memcg:ffff0000cbd06000
aops:shmem_aops ino:15 dentry name(?):"dev/zero"
flags: 0x5ffe00000080816(referenced|uptodate|lru|arch_1|swapbacked|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffe00000080816 fffffc0003e38ec8 fffffc0003e38f48 ffff0000cfc9eeb8
raw: 00000000000008c8 0000000000000000 0000000200000000 ffff0000cbd06000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f8e3c780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000f8e3c800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000f8e3c880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                               ^
 ffff0000f8e3c900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000f8e3c980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
hpfs: hpfs_map_sector(): read error
hpfs: hpfs_map_sector(): read error
hpfs: hpfs_map_sector(): read error
hpfs: hpfs_map_sector(): read error
hpfs: hpfs_map_4sectors(): unaligned read
hpfs: hpfs_map_4sectors(): unaligned read
hpfs: filesystem error: unable to find root dir