==================================================================
BUG: KASAN: use-after-free in memcmp+0x172/0x1c0 lib/string.c:681
Read of size 8 at addr ffff888082b65002 by task syz-executor.2/23289

CPU: 1 PID: 23289 Comm: syz-executor.2 Not tainted 6.5.0-rc3-syzkaller-00044-g0a8db05b571a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
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:860 [inline]
 ntfs_fill_super+0x6e0/0x43b0 fs/ntfs3/super.c:1141
 get_tree_bdev+0x43e/0x7d0 fs/super.c:1318
 vfs_get_tree+0x88/0x350 fs/super.c:1519
 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: 0033:0x7feccd67e22a
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:00007fecce33bee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fecce33bf80 RCX: 00007feccd67e22a
RDX: 0000000020000180 RSI: 0000000020000000 RDI: 00007fecce33bf40
RBP: 0000000020000180 R08: 00007fecce33bf80 R09: 0000000000000800
R10: 0000000000000800 R11: 0000000000000202 R12: 0000000020000000
R13: 00007fecce33bf40 R14: 000000000001f43b R15: 0000000020000100
 </TASK>

The buggy address belongs to the physical page:
page:ffffea00020ad940 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x1 pfn:0x82b65
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffff7f(buddy)
raw: 00fff00000000000 ffffea0001475388 ffffea0000e28cc8 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffff7f 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 23235, tgid 23227 (syz-executor.1), ts 1447462520531, free_ts 1447603294719
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1570
 prep_new_page mm/page_alloc.c:1577 [inline]
 get_page_from_freelist+0x10a9/0x31e0 mm/page_alloc.c:3221
 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4477
 __folio_alloc+0x16/0x40 mm/page_alloc.c:4509
 vma_alloc_folio+0x156/0x890 mm/mempolicy.c:2240
 shmem_alloc_folio+0xb5/0x170 mm/shmem.c:1579
 shmem_alloc_and_acct_folio+0x168/0x5e0 mm/shmem.c:1603
 shmem_get_folio_gfp+0xce7/0x1b60 mm/shmem.c:1948
 shmem_fault+0x1db/0x890 mm/shmem.c:2163
 __do_fault+0x107/0x5f0 mm/memory.c:4198
 do_read_fault mm/memory.c:4547 [inline]
 do_fault mm/memory.c:4670 [inline]
 do_pte_missing mm/memory.c:3664 [inline]
 handle_pte_fault mm/memory.c:4939 [inline]
 __handle_mm_fault+0x27e0/0x3b80 mm/memory.c:5079
 handle_mm_fault+0x2ab/0x9d0 mm/memory.c:5233
 faultin_page mm/gup.c:959 [inline]
 __get_user_pages+0x5c1/0x1010 mm/gup.c:1258
 populate_vma_page_range+0x2d4/0x410 mm/gup.c:1649
 __mm_populate+0x1d7/0x380 mm/gup.c:1758
 mm_populate include/linux/mm.h:3196 [inline]
 vm_mmap_pgoff+0x2c9/0x3b0 mm/util.c:548
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1161 [inline]
 free_unref_page_prepare+0x508/0xb90 mm/page_alloc.c:2348
 free_unref_page_list+0xe6/0xb30 mm/page_alloc.c:2489
 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+0x5c0/0x1080 mm/shmem.c:954
 shmem_truncate_range mm/shmem.c:1049 [inline]
 shmem_evict_inode+0x331/0xb40 mm/shmem.c:1164
 evict+0x2ed/0x6b0 fs/inode.c:665
 iput_final fs/inode.c:1791 [inline]
 iput.part.0+0x55e/0x7a0 fs/inode.c:1817
 iput+0x5c/0x80 fs/inode.c:1807
 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+0x53c/0xac0 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:
 ffff888082b64f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888082b64f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888082b65000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888082b65080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888082b65100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
BUG: KASAN: use-after-free in memcmp+0x1a3/0x1c0 lib/string.c:692
Read of size 1 at addr ffff888082b65002 by task syz-executor.2/23289

CPU: 0 PID: 23289 Comm: syz-executor.2 Tainted: G    B              6.5.0-rc3-syzkaller-00044-g0a8db05b571a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
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+0x1a3/0x1c0 lib/string.c:692
 memcmp include/linux/fortify-string.h:728 [inline]
 ntfs_init_from_boot fs/ntfs3/super.c:860 [inline]
 ntfs_fill_super+0x6e0/0x43b0 fs/ntfs3/super.c:1141
 get_tree_bdev+0x43e/0x7d0 fs/super.c:1318
 vfs_get_tree+0x88/0x350 fs/super.c:1519
 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: 0033:0x7feccd67e22a
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:00007fecce33bee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fecce33bf80 RCX: 00007feccd67e22a
RDX: 0000000020000180 RSI: 0000000020000000 RDI: 00007fecce33bf40
RBP: 0000000020000180 R08: 00007fecce33bf80 R09: 0000000000000800
R10: 0000000000000800 R11: 0000000000000202 R12: 0000000020000000
R13: 00007fecce33bf40 R14: 000000000001f43b R15: 0000000020000100
 </TASK>

The buggy address belongs to the physical page:
page:ffffea00020ad940 refcount:1 mapcount:0 mapping:ffff888053a289a8 index:0x46f pfn:0x82b65
memcg:ffff888037d54000
aops:shmem_aops ino:6f2 dentry name:"memfd:syzkaller"
flags: 0xfff4000008001e(referenced|uptodate|dirty|lru|swapbacked|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff4000008001e ffffea0000e28cc8 ffffea0001475388 ffff888053a289a8
raw: 000000000000046f 0000000000000000 00000001ffffffff ffff888037d54000
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 23295, tgid 23294 (syz-executor.4), ts 1450635079871, free_ts 1450731657892
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1570
 prep_new_page mm/page_alloc.c:1577 [inline]
 get_page_from_freelist+0x10a9/0x31e0 mm/page_alloc.c:3221
 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4477
 __folio_alloc+0x16/0x40 mm/page_alloc.c:4509
 vma_alloc_folio+0x156/0x890 mm/mempolicy.c:2240
 shmem_alloc_folio+0xb5/0x170 mm/shmem.c:1579
 shmem_alloc_and_acct_folio+0x168/0x5e0 mm/shmem.c:1603
 shmem_get_folio_gfp+0xce7/0x1b60 mm/shmem.c:1948
 shmem_get_folio mm/shmem.c:2079 [inline]
 shmem_write_begin+0x15c/0x390 mm/shmem.c:2573
 generic_perform_write+0x278/0x600 mm/filemap.c:3923
 __generic_file_write_iter+0x1f9/0x240 mm/filemap.c:4018
 generic_file_write_iter+0xe3/0x350 mm/filemap.c:4044
 call_write_iter include/linux/fs.h:1871 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x650/0xe40 fs/read_write.c:584
 ksys_write+0x12f/0x250 fs/read_write.c:637
 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
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1161 [inline]
 free_unref_page_prepare+0x508/0xb90 mm/page_alloc.c:2348
 free_unref_page_list+0xe6/0xb30 mm/page_alloc.c:2489
 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+0x5c0/0x1080 mm/shmem.c:954
 shmem_truncate_range mm/shmem.c:1049 [inline]
 shmem_evict_inode+0x331/0xb40 mm/shmem.c:1164
 evict+0x2ed/0x6b0 fs/inode.c:665
 iput_final fs/inode.c:1791 [inline]
 iput.part.0+0x55e/0x7a0 fs/inode.c:1817
 iput+0x5c/0x80 fs/inode.c:1807
 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+0x53c/0xac0 fs/file_table.c:392
 task_work_run+0x14d/0x240 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297

Memory state around the buggy address:
 ffff888082b64f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888082b64f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888082b65000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888082b65080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888082b65100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
ntfs3: loop2: Alternative boot signature is not NTFS.