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BUG: KASAN: slab-out-of-bounds in ntfs_filldir fs/ntfs/dir.c:1021 [inline]
BUG: KASAN: slab-out-of-bounds in ntfs_readdir+0xdda/0x3550 fs/ntfs/dir.c:1200
Read of size 1 at addr ffff8880233cede1 by task syz.0.50/4527

CPU: 0 PID: 4527 Comm: syz.0.50 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 print_address_description+0x60/0x2d0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xdf/0x130 mm/kasan/report.c:451
 ntfs_filldir fs/ntfs/dir.c:1021 [inline]
 ntfs_readdir+0xdda/0x3550 fs/ntfs/dir.c:1200
 iterate_dir+0x218/0x560 fs/readdir.c:-1
 __do_sys_getdents fs/readdir.c:286 [inline]
 __se_sys_getdents+0xe5/0x250 fs/readdir.c:271
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f11e2297749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f11e04fe038 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007f11e24edfa0 RCX: 00007f11e2297749
RDX: 000000000000003d RSI: 0000200000000040 RDI: 0000000000000005
RBP: 00007f11e231bf91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f11e24ee038 R14: 00007f11e24edfa0 R15: 00007ffefdd310f8
 </TASK>

Allocated by task 4527:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 __kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522
 kmalloc include/linux/slab.h:612 [inline]
 ntfs_readdir+0x798/0x3550 fs/ntfs/dir.c:1162
 iterate_dir+0x218/0x560 fs/readdir.c:-1
 __do_sys_getdents fs/readdir.c:286 [inline]
 __se_sys_getdents+0xe5/0x250 fs/readdir.c:271
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff8880233ced80
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 33 bytes to the right of
 64-byte region [ffff8880233ced80, ffff8880233cedc0)
The buggy address belongs to the page:
page:ffffea00008cf380 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x233ce
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 dead000000000100 dead000000000122 ffff888016841640
raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 144, ts 9133009337, free_ts 9131981373
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192
 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487
 alloc_slab_page mm/slub.c:1780 [inline]
 allocate_slab mm/slub.c:1917 [inline]
 new_slab+0xc0/0x4b0 mm/slub.c:1980
 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3013
 __slab_alloc mm/slub.c:3100 [inline]
 slab_alloc_node mm/slub.c:3191 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 kmem_cache_alloc_trace+0x1a5/0x2a0 mm/slub.c:3250
 kmalloc include/linux/slab.h:607 [inline]
 kzalloc include/linux/slab.h:738 [inline]
 percpu_ref_init+0xc0/0x350 lib/percpu-refcount.c:76
 blkg_alloc+0xca/0x660 block/blk-cgroup.c:162
 blkcg_init_queue+0x26/0x430 block/blk-cgroup.c:1198
 blk_alloc_queue+0x439/0x5a0 block/blk-core.c:582
 blk_mq_init_queue_data block/blk-mq.c:3150 [inline]
 blk_mq_init_queue+0x33/0xd0 block/blk-mq.c:3164
 scsi_alloc_sdev+0x6f2/0xab0 drivers/scsi/scsi_scan.c:319
 scsi_probe_and_add_lun+0x1bf/0x3d00 drivers/scsi/scsi_scan.c:1157
 __scsi_scan_target+0x1d8/0x1010 drivers/scsi/scsi_scan.c:1638
 scsi_scan_channel drivers/scsi/scsi_scan.c:1726 [inline]
 scsi_scan_host_selected+0x36e/0x690 drivers/scsi/scsi_scan.c:1755
 do_scsi_scan_host drivers/scsi/scsi_scan.c:1894 [inline]
 do_scan_async+0x11a/0x700 drivers/scsi/scsi_scan.c:1904
 async_run_entry_fn+0x9f/0x3e0 kernel/async.c:127
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
 free_unref_page+0x94/0x280 mm/page_alloc.c:3396
 mm_free_pgd kernel/fork.c:653 [inline]
 __mmdrop+0xaa/0x3e0 kernel/fork.c:704
 free_bprm+0x141/0x300 fs/exec.c:1494
 kernel_execve+0x380/0x900 fs/exec.c:2015
 call_usermodehelper_exec_async+0x207/0x350 kernel/umh.c:112
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

Memory state around the buggy address:
 ffff8880233cec80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880233ced00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8880233ced80: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
                                                       ^
 ffff8880233cee00: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
 ffff8880233cee80: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
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