hpfs: You really don't want any checks? You are crazy...
hpfs: Code page index out of array
hpfs: code page support is disabled
==================================================================
BUG: KASAN: use-after-free in strcmp+0xc0/0xf4 lib/string.c:283
Read of size 1 at addr ffff0001016e08a6 by task syz.4.546/9633

CPU: 0 UID: 0 PID: 9633 Comm: syz.4.546 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xa8/0x238 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:482
 kasan_report+0xb0/0x110 mm/kasan/report.c:595
 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378
 strcmp+0xc0/0xf4 lib/string.c:283
 hpfs_get_ea+0xfc/0x9e8 fs/hpfs/ea.c:139
 hpfs_read_inode+0x15c/0xcac fs/hpfs/inode.c:63
 hpfs_fill_super+0xe10/0x192c fs/hpfs/super.c:650
 get_tree_bdev_flags+0x360/0x414 fs/super.c:1691
 get_tree_bdev+0x2c/0x3c fs/super.c:1714
 hpfs_get_tree+0x28/0x38 fs/hpfs/super.c:698
 vfs_get_tree+0x90/0x28c fs/super.c:1751
 fc_mount fs/namespace.c:1208 [inline]
 do_new_mount_fc fs/namespace.c:3651 [inline]
 do_new_mount+0x284/0x944 fs/namespace.c:3727
 path_mount+0x5b4/0xdfc fs/namespace.c:4037
 do_mount fs/namespace.c:4050 [inline]
 __do_sys_mount fs/namespace.c:4238 [inline]
 __se_sys_mount fs/namespace.c:4215 [inline]
 __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4215
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xa08 pfn:0x1416e0
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 05ffc00000000000 fffffdffc3ffb008 fffffdffc40a4808 0000000000000000
raw: 0000000000000a08 0000000000000004 00000000f0000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0001016e0780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0001016e0800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0001016e0880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff0001016e0900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0001016e0980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
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