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BUG: KASAN: use-after-free in memcmp+0x172/0x1c0 lib/string.c:681
Read of size 8 at addr ffff888094541002 by task syz-executor.3/17485

CPU: 1 PID: 17485 Comm: syz-executor.3 Not tainted 6.5.0-next-20230831-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xc4/0x620 mm/kasan/report.c:475
 kasan_report+0xda/0x110 mm/kasan/report.c:588
 memcmp+0x172/0x1c0 lib/string.c:681
 memcmp include/linux/fortify-string.h:728 [inline]
 ntfs_init_from_boot fs/ntfs3/super.c:854 [inline]
 ntfs_fill_super+0x6f2/0x4330 fs/ntfs3/super.c:1135
 get_tree_bdev+0x390/0x630 fs/super.c:1551
 vfs_get_tree+0x8c/0x370 fs/super.c:1724
 do_new_mount fs/namespace.c:3335 [inline]
 path_mount+0x1492/0x1ed0 fs/namespace.c:3662
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount fs/namespace.c:3861 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:3861
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f414c27e1ea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f414cffaee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f414cffaf80 RCX: 00007f414c27e1ea
RDX: 00000000200000c0 RSI: 0000000020000080 RDI: 00007f414cffaf40
RBP: 00000000200000c0 R08: 00007f414cffaf80 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000080
R13: 00007f414cffaf40 R14: 000000000001f1be R15: 0000000020000100
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0002515040 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x94541
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 ffffea0002515088 ffffea0002556988 0000000000000000
raw: 0000000000000001 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 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 17473, tgid 17464 (syz-executor.4), ts 645913685799, free_ts 646599152736
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1530
 prep_new_page mm/page_alloc.c:1537 [inline]
 get_page_from_freelist+0xf17/0x2e50 mm/page_alloc.c:3200
 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4456
 __folio_alloc+0x16/0x40 mm/page_alloc.c:4488
 vma_alloc_folio+0x156/0x890 mm/mempolicy.c:2259
 shmem_alloc_folio+0xb5/0x170 mm/shmem.c:1675
 shmem_alloc_and_acct_folio+0xcb/0x140 mm/shmem.c:1700
 shmem_get_folio_gfp+0xbe9/0x1890 mm/shmem.c:2037
 shmem_fault+0x1db/0xb50 mm/shmem.c:2244
 __do_fault+0x107/0x600 mm/memory.c:4207
 do_read_fault mm/memory.c:4571 [inline]
 do_fault mm/memory.c:4708 [inline]
 do_pte_missing mm/memory.c:3672 [inline]
 handle_pte_fault mm/memory.c:4981 [inline]
 __handle_mm_fault+0x29aa/0x3e20 mm/memory.c:5122
 handle_mm_fault+0x47a/0xa00 mm/memory.c:5287
 faultin_page mm/gup.c:956 [inline]
 __get_user_pages+0x4b3/0x1410 mm/gup.c:1239
 populate_vma_page_range+0x2d4/0x410 mm/gup.c:1666
 __mm_populate+0x1d7/0x380 mm/gup.c:1775
 mm_populate include/linux/mm.h:3305 [inline]
 vm_mmap_pgoff+0x2cd/0x3b0 mm/util.c:551
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1130 [inline]
 free_unref_page_prepare+0x476/0xa40 mm/page_alloc.c:2342
 free_unref_page_list+0xe6/0xb30 mm/page_alloc.c:2481
 release_pages+0x32a/0x14e0 mm/swap.c:1042
 __folio_batch_release+0x77/0xe0 mm/swap.c:1062
 folio_batch_release include/linux/pagevec.h:83 [inline]
 shmem_undo_range+0x582/0x1150 mm/shmem.c:1022
 shmem_truncate_range mm/shmem.c:1131 [inline]
 shmem_evict_inode+0x392/0xb50 mm/shmem.c:1260
 evict+0x2ed/0x6b0 fs/inode.c:664
 iput_final fs/inode.c:1775 [inline]
 iput.part.0+0x55e/0x7a0 fs/inode.c:1801
 iput+0x5c/0x80 fs/inode.c:1791
 dentry_unlink_inode+0x292/0x430 fs/dcache.c:401
 __dentry_kill+0x3b8/0x640 fs/dcache.c:607
 dentry_kill fs/dcache.c:733 [inline]
 dput+0x8dd/0xfd0 fs/dcache.c:913
 __fput+0x536/0xa70 fs/file_table.c:392
 task_work_run+0x14d/0x240 kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa99/0x2a20 kernel/exit.c:874
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024

Memory state around the buggy address:
 ffff888094540f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888094540f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888094541000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888094541080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888094541100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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