syzbot

loop4: detected capacity change from 0 to 4096
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BUG: KASAN: slab-out-of-bounds in ntfs_read_run_nb+0x4e2/0xdb0 fs/ntfs3/fsntfs.c:1232
Write of size 1024 at addr ffff888031ea6800 by task syz.4.151/6748

CPU: 1 UID: 0 PID: 6748 Comm: syz.4.151 Tainted: G        W           6.16.0-syzkaller-11568-gd632ab86aff2 #0 PREEMPT_{RT,(full)} 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:189
 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
 ntfs_read_run_nb+0x4e2/0xdb0 fs/ntfs3/fsntfs.c:1232
 ntfs_read_bh+0x40/0x7e0 fs/ntfs3/fsntfs.c:1293
 mi_read+0x194/0x5a0 fs/ntfs3/record.c:133
 ntfs_read_mft fs/ntfs3/inode.c:70 [inline]
 ntfs_iget5+0x45b/0x37c0 fs/ntfs3/inode.c:540
 ntfs_fill_super+0x3927/0x40b0 fs/ntfs3/super.c:1519
 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692
 vfs_get_tree+0x8f/0x2b0 fs/super.c:1815
 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3805
 do_mount fs/namespace.c:4133 [inline]
 __do_sys_mount fs/namespace.c:4344 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4321
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f833efe030a
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:00007f833ce3de68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f833ce3def0 RCX: 00007f833efe030a
RDX: 0000200000000040 RSI: 000020000001f740 RDI: 00007f833ce3deb0
RBP: 0000200000000040 R08: 00007f833ce3def0 R09: 0000000000000018
R10: 0000000000000018 R11: 0000000000000246 R12: 000020000001f740
R13: 00007f833ce3deb0 R14: 000000000001f751 R15: 0000200000000000
 </TASK>

Allocated by task 6748:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4365 [inline]
 __kmalloc_noprof+0x1ef/0x430 mm/slub.c:4377
 kmalloc_noprof include/linux/slab.h:909 [inline]
 mi_init+0x76/0xe0 fs/ntfs3/record.c:105
 ntfs_read_mft fs/ntfs3/inode.c:54 [inline]
 ntfs_iget5+0x356/0x37c0 fs/ntfs3/inode.c:540
 ntfs_fill_super+0x3927/0x40b0 fs/ntfs3/super.c:1519
 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692
 vfs_get_tree+0x8f/0x2b0 fs/super.c:1815
 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3805
 do_mount fs/namespace.c:4133 [inline]
 __do_sys_mount fs/namespace.c:4344 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4321
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888031ea6800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 0 bytes inside of
 allocated 1023-byte region [ffff888031ea6800, ffff888031ea6bff)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x31ea0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x80000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000040 ffff888019841dc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 0080000000000040 ffff888019841dc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 0080000000000003 ffffea0000c7a801 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd60c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5978, tgid 5976 (syz.0.1), ts 105757431951, free_ts 102903741107
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x2119/0x21b0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
 alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:2487 [inline]
 allocate_slab+0x8a/0x370 mm/slub.c:2655
 new_slab mm/slub.c:2709 [inline]
 ___slab_alloc+0x8d1/0xdd0 mm/slub.c:3891
 __slab_alloc mm/slub.c:3981 [inline]
 __slab_alloc_node mm/slub.c:4056 [inline]
 slab_alloc_node mm/slub.c:4217 [inline]
 __kmalloc_cache_noprof+0xe6/0x320 mm/slub.c:4391
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 xlog_cil_init+0x57/0x820 fs/xfs/xfs_log_cil.c:1920
 xlog_alloc_log+0x1108/0x13f0 fs/xfs/xfs_log.c:1498
 xfs_log_mount+0xc8/0x3e0 fs/xfs/xfs_log.c:606
 xfs_mountfs+0xe5e/0x2330 fs/xfs/xfs_mount.c:1012
 xfs_fs_fill_super+0x1185/0x15d0 fs/xfs/xfs_super.c:1965
 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692
 vfs_get_tree+0x8f/0x2b0 fs/super.c:1815
 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3805
 do_mount fs/namespace.c:4133 [inline]
 __do_sys_mount fs/namespace.c:4344 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4321
page last free pid 5842 tgid 5842 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0xb59/0xce0 mm/page_alloc.c:2895
 __slab_free+0x2db/0x390 mm/slub.c:4591
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4180 [inline]
 slab_alloc_node mm/slub.c:4229 [inline]
 __do_kmalloc_node mm/slub.c:4364 [inline]
 __kmalloc_node_track_caller_noprof+0x1ab/0x450 mm/slub.c:4384
 memdup_user+0x2b/0xd0 mm/util.c:221
 strndup_user+0x68/0xd0 mm/util.c:280
 copy_mount_string fs/namespace.c:4028 [inline]
 __do_sys_mount fs/namespace.c:4334 [inline]
 __se_sys_mount+0xde/0x410 fs/namespace.c:4321
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888031ea6a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888031ea6b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888031ea6b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 07
                                                                ^
 ffff888031ea6c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888031ea6c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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