loop0: detected capacity change from 0 to 128
hpfs: filesystem error: invalid number of hotfixes: 2066844986, used: 2066844985; already mounted read-only
hpfs: filesystem error: improperly stopped
hpfs: filesystem error: warning: spare dnodes used, try chkdsk
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+0x6b/0xc0 lib/string.c:265
Read of size 1 at addr ffff8880457538a6 by task syz-executor115/5631

CPU: 0 UID: 0 PID: 5631 Comm: syz-executor115 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 strcmp+0x6b/0xc0 lib/string.c:265
 hpfs_get_ea+0x137/0xeb0 fs/hpfs/ea.c:139
 hpfs_read_inode+0x1a9/0x1060 fs/hpfs/inode.c:63
 hpfs_fill_super+0x1275/0x1fa0 fs/hpfs/super.c:652
 get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1883
 vfs_get_tree+0x92/0x2a0 fs/super.c:1943
 fc_mount fs/namespace.c:1282 [inline]
 do_new_mount_fc fs/namespace.c:3910 [inline]
 do_new_mount+0x325/0xb00 fs/namespace.c:3986
 do_mount fs/namespace.c:4350 [inline]
 __do_sys_mount fs/namespace.c:4565 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4542
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fce8ba610aa
Code: 48 c7 c2 d8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd6f290bb8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fce8ba610aa
RDX: 0000200000000000 RSI: 0000200000000040 RDI: 00007ffd6f290c00
RBP: 0000000000000004 R08: 00007ffd6f290c40 R09: 0000000000000000
R10: 0000000003200041 R11: 0000000000000206 R12: 0000200000000040
R13: 00007ffd6f290c40 R14: 0000000000010000 R15: 0000000000000003
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7fe06f434 pfn:0x45753
flags: 0x80000000000000(node=0|zone=1)
raw: 0080000000000000 dead000000000100 dead000000000122 0000000000000000
raw: 00000007fe06f434 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 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 5613, tgid 5613 (sshd-session), ts 92992686310
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1856
 prep_new_page mm/page_alloc.c:1864 [inline]
 get_page_from_freelist+0x258b/0x2600 mm/page_alloc.c:3935
 __alloc_frozen_pages_noprof+0x227/0x440 mm/page_alloc.c:5444
 alloc_pages_mpol+0xd4/0x280 mm/mempolicy.c:2511
 folio_alloc_mpol_noprof+0x3b/0x1e0 mm/mempolicy.c:2530
 vma_alloc_folio_noprof+0xe1/0x1e0 mm/mempolicy.c:2565
 folio_prealloc mm/memory.c:-1 [inline]
 alloc_anon_folio mm/memory.c:5456 [inline]
 do_anonymous_page mm/memory.c:5551 [inline]
 do_pte_missing+0x7fb/0x2970 mm/memory.c:4761
 handle_pte_fault mm/memory.c:6627 [inline]
 __handle_mm_fault mm/memory.c:6776 [inline]
 handle_mm_fault+0xf64/0x28c0 mm/memory.c:6943
 do_user_addr_fault+0xb35/0x1480 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
page last free pid 5613 tgid 5613 ts 93028405350 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1403 [inline]
 free_unref_folios+0xd0b/0x1940 mm/page_alloc.c:3014
 folios_put_refs+0x815/0x920 mm/folio.c:1039
 free_pages_and_swap_cache+0x2ba/0x490 mm/swap_state.c:654
 __tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline]
 tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu+0x6d3/0xa30 mm/mmu_gather.c:404
 tlb_finish_mmu+0xf4/0x220 mm/mmu_gather.c:529
 unmap_region+0x2a5/0x330 mm/vma.c:516
 vms_clear_ptes mm/vma.c:1376 [inline]
 vms_complete_munmap_vmas+0x442/0xc10 mm/vma.c:1418
 do_vmi_align_munmap+0x3bd/0x4d0 mm/vma.c:1677
 do_vmi_munmap+0x252/0x2d0 mm/vma.c:1725
 __vm_munmap+0x240/0x420 mm/vma.c:3562
 __do_sys_munmap mm/mmap.c:1094 [inline]
 __se_sys_munmap mm/mmap.c:1091 [inline]
 __x64_sys_munmap+0x60/0x70 mm/mmap.c:1091
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888045753780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888045753800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888045753880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff888045753900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888045753980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================