hpfs: code page support is disabled
==================================================================
BUG: KASAN: use-after-free in strcmp+0x6f/0xc0
Read of size 1 at addr ffff88811e0108a6 by task syz.0.24/6002

CPU: 0 UID: 0 PID: 6002 Comm: syz.0.24 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 strcmp+0x6f/0xc0
 hpfs_get_ea+0x114/0xdb0
 hpfs_read_inode+0x19d/0x1010
 hpfs_fill_super+0x129d/0x2040
 get_tree_bdev_flags+0x40e/0x4d0
 vfs_get_tree+0x92/0x2b0
 do_new_mount+0x2a2/0xa30
 __se_sys_mount+0x317/0x410
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5a3cb903ca
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5a3d989e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5a3d989ef0 RCX: 00007f5a3cb903ca
RDX: 000020000000a000 RSI: 0000200000009ec0 RDI: 00007f5a3d989eb0
RBP: 000020000000a000 R08: 00007f5a3d989ef0 R09: 0000000003a00041
R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007f5a3d989eb0 R14: 0000000000009e22 R15: 0000200000001540
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x200000246 pfn:0x11e010
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000200000246 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 9, migratetype Movable, gfp_mask 0x3d24ca(GFP_TRANSHUGE|__GFP_NORETRY|__GFP_THISNODE), pid 5984, tgid 5983 (syz.2.21), ts 57600176203, free_ts 57719201084
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x1dc/0x4a0
 vma_alloc_folio_noprof+0xe4/0x200
 vma_alloc_anon_folio_pmd+0x39/0x320
 do_huge_pmd_wp_page+0x2d5/0x2300
 __handle_mm_fault+0xedd/0x5440
 handle_mm_fault+0x40a/0x8e0
 do_user_addr_fault+0x764/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
page last free pid 5984 tgid 5983 stack trace:
 free_unref_folios+0xdbd/0x1520
 shrink_folio_list+0x44dd/0x4cd0
 reclaim_folio_list+0xeb/0x500
 reclaim_pages+0x49a/0x5b0
 madvise_cold_or_pageout_pte_range+0x14ad/0x1d00
 walk_pgd_range+0xfe9/0x1d40
 __walk_page_range+0x14c/0x710
 walk_page_range_vma+0x393/0x440
 madvise_vma_behavior+0x31c2/0x3af0
 madvise_walk_vmas+0x51c/0xa30
 madvise_do_behavior+0x38e/0x550
 do_madvise+0x1bc/0x270
 __x64_sys_madvise+0xa7/0xc0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88811e010780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88811e010800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88811e010880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88811e010900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88811e010980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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