linux-kernel - [syzbot] [ntfs3?] memory leak in ni_add

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Message-ID: <69122a96.a70a0220.22f260.00fe.GAE@google.com>
Date: Mon, 10 Nov 2025 10:10:30 -0800
From: syzbot <syzbot+3932ccb896e06f7414c9@...kaller.appspotmail.com>
To: almaz.alexandrovich@...agon-software.com, linux-kernel@...r.kernel.org, 
	ntfs3@...ts.linux.dev, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [ntfs3?] memory leak in ni_add_subrecord

Hello,

syzbot found the following issue on:

HEAD commit:    e811c33b1f13 Merge tag 'drm-fixes-2025-11-08' of https://g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1590ea58580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cb128cd5cb439809
dashboard link: https://syzkaller.appspot.com/bug?extid=3932ccb896e06f7414c9
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1431bbcd980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16250412580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cc3290299f36/disk-e811c33b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/987fe9401d05/vmlinux-e811c33b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/23be5a0e8ba6/bzImage-e811c33b.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/a2535f9cc9c1/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3932ccb896e06f7414c9@...kaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff888110bef280 (size 128):
  comm "syz.0.17", pid 6082, jiffies 4294944677
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 48 37 28 81 88 ff ff  .........H7(....
  backtrace (crc 126a088f):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4979 [inline]
    slab_alloc_node mm/slub.c:5284 [inline]
    __kmalloc_cache_noprof+0x3a6/0x5b0 mm/slub.c:5762
    kmalloc_noprof include/linux/slab.h:957 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    ni_add_subrecord+0x31/0x180 fs/ntfs3/frecord.c:317
    ntfs_look_free_mft+0xf0/0x790 fs/ntfs3/fsntfs.c:715
    ni_ins_attr_ext+0x40c/0x6a0 fs/ntfs3/frecord.c:988
    ni_insert_attr+0x1d1/0x480 fs/ntfs3/frecord.c:1091
    ni_insert_resident+0x85/0x140 fs/ntfs3/frecord.c:1475
    ni_add_name+0x15b/0x2e0 fs/ntfs3/frecord.c:2987
    ni_rename+0x4c/0x100 fs/ntfs3/frecord.c:3026
    ntfs_rename+0x46c/0x5d0 fs/ntfs3/namei.c:332
    vfs_rename+0x94b/0x1340 fs/namei.c:5216
    do_renameat2+0x5f5/0x870 fs/namei.c:5364
    __do_sys_rename fs/namei.c:5411 [inline]
    __se_sys_rename fs/namei.c:5409 [inline]
    __x64_sys_rename+0x42/0x50 fs/namei.c:5409
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888109093400 (size 1024):
  comm "syz.0.17", pid 6082, jiffies 4294944677
  hex dump (first 32 bytes):
    46 49 4c 45 2a 00 03 00 00 00 00 00 00 00 00 00  FILE*...........
    03 00 00 00 30 00 01 00 88 02 00 00 00 04 00 00  ....0...........
  backtrace (crc 7197c55e):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4979 [inline]
    slab_alloc_node mm/slub.c:5284 [inline]
    __do_kmalloc_node mm/slub.c:5645 [inline]
    __kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5658
    kmalloc_noprof include/linux/slab.h:961 [inline]
    mi_init+0x2b/0x50 fs/ntfs3/record.c:105
    mi_format_new+0x40/0x220 fs/ntfs3/record.c:422
    ni_add_subrecord+0x6b/0x180 fs/ntfs3/frecord.c:321
    ntfs_look_free_mft+0xf0/0x790 fs/ntfs3/fsntfs.c:715
    ni_ins_attr_ext+0x40c/0x6a0 fs/ntfs3/frecord.c:988
    ni_insert_attr+0x1d1/0x480 fs/ntfs3/frecord.c:1091
    ni_insert_resident+0x85/0x140 fs/ntfs3/frecord.c:1475
    ni_add_name+0x15b/0x2e0 fs/ntfs3/frecord.c:2987
    ni_rename+0x4c/0x100 fs/ntfs3/frecord.c:3026
    ntfs_rename+0x46c/0x5d0 fs/ntfs3/namei.c:332
    vfs_rename+0x94b/0x1340 fs/namei.c:5216
    do_renameat2+0x5f5/0x870 fs/namei.c:5364
    __do_sys_rename fs/namei.c:5411 [inline]
    __se_sys_rename fs/namei.c:5409 [inline]
    __x64_sys_rename+0x42/0x50 fs/namei.c:5409
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888110bef680 (size 128):
  comm "syz.0.18", pid 6093, jiffies 4294944686
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 48 37 28 81 88 ff ff  .........H7(....
  backtrace (crc ada06205):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4979 [inline]
    slab_alloc_node mm/slub.c:5284 [inline]
    __kmalloc_cache_noprof+0x3a6/0x5b0 mm/slub.c:5762
    kmalloc_noprof include/linux/slab.h:957 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    ni_add_subrecord+0x31/0x180 fs/ntfs3/frecord.c:317
    ntfs_look_free_mft+0xf0/0x790 fs/ntfs3/fsntfs.c:715
    ni_ins_attr_ext+0x40c/0x6a0 fs/ntfs3/frecord.c:988
    ni_insert_attr+0x1d1/0x480 fs/ntfs3/frecord.c:1091
    ni_insert_resident+0x85/0x140 fs/ntfs3/frecord.c:1475
    ni_add_name+0x15b/0x2e0 fs/ntfs3/frecord.c:2987
    ni_rename+0x4c/0x100 fs/ntfs3/frecord.c:3026
    ntfs_rename+0x46c/0x5d0 fs/ntfs3/namei.c:332
    vfs_rename+0x94b/0x1340 fs/namei.c:5216
    do_renameat2+0x5f5/0x870 fs/namei.c:5364
    __do_sys_rename fs/namei.c:5411 [inline]
    __se_sys_rename fs/namei.c:5409 [inline]
    __x64_sys_rename+0x42/0x50 fs/namei.c:5409
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff8881135d2000 (size 1024):
  comm "syz.0.18", pid 6093, jiffies 4294944686
  hex dump (first 32 bytes):
    46 49 4c 45 2a 00 03 00 00 00 00 00 00 00 00 00  FILE*...........
    03 00 00 00 30 00 01 00 88 02 00 00 00 04 00 00  ....0...........
  backtrace (crc 7197c55e):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4979 [inline]
    slab_alloc_node mm/slub.c:5284 [inline]
    __do_kmalloc_node mm/slub.c:5645 [inline]
    __kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5658
    kmalloc_noprof include/linux/slab.h:961 [inline]
    mi_init+0x2b/0x50 fs/ntfs3/record.c:105
    mi_format_new+0x40/0x220 fs/ntfs3/record.c:422
    ni_add_subrecord+0x6b/0x180 fs/ntfs3/frecord.c:321
    ntfs_look_free_mft+0xf0/0x790 fs/ntfs3/fsntfs.c:715
    ni_ins_attr_ext+0x40c/0x6a0 fs/ntfs3/frecord.c:988
    ni_insert_attr+0x1d1/0x480 fs/ntfs3/frecord.c:1091
    ni_insert_resident+0x85/0x140 fs/ntfs3/frecord.c:1475
    ni_add_name+0x15b/0x2e0 fs/ntfs3/frecord.c:2987
    ni_rename+0x4c/0x100 fs/ntfs3/frecord.c:3026
    ntfs_rename+0x46c/0x5d0 fs/ntfs3/namei.c:332
    vfs_rename+0x94b/0x1340 fs/namei.c:5216
    do_renameat2+0x5f5/0x870 fs/namei.c:5364
    __do_sys_rename fs/namei.c:5411 [inline]
    __se_sys_rename fs/namei.c:5409 [inline]
    __x64_sys_rename+0x42/0x50 fs/namei.c:5409
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888110bef780 (size 128):
  comm "syz.0.19", pid 6099, jiffies 4294944695
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 30 25 0f 81 88 ff ff  .........0%.....
  backtrace (crc 6428af85):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4979 [inline]
    slab_alloc_node mm/slub.c:5284 [inline]
    __kmalloc_cache_noprof+0x3a6/0x5b0 mm/slub.c:5762
    kmalloc_noprof include/linux/slab.h:957 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    ni_add_subrecord+0x31/0x180 fs/ntfs3/frecord.c:317
    ntfs_look_free_mft+0xf0/0x790 fs/ntfs3/fsntfs.c:715
    ni_ins_attr_ext+0x40c/0x6a0 fs/ntfs3/frecord.c:988
    ni_insert_attr+0x1d1/0x480 fs/ntfs3/frecord.c:1091
    ni_insert_resident+0x85/0x140 fs/ntfs3/frecord.c:1475
    ni_add_name+0x15b/0x2e0 fs/ntfs3/frecord.c:2987
    ni_rename+0x4c/0x100 fs/ntfs3/frecord.c:3026
    ntfs_rename+0x46c/0x5d0 fs/ntfs3/namei.c:332
    vfs_rename+0x94b/0x1340 fs/namei.c:5216
    do_renameat2+0x5f5/0x870 fs/namei.c:5364
    __do_sys_rename fs/namei.c:5411 [inline]
    __se_sys_rename fs/namei.c:5409 [inline]
    __x64_sys_rename+0x42/0x50 fs/namei.c:5409
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF


---
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If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
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(See the list of subsystem names on the web dashboard)

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#syz dup: exact-subject-of-another-report

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#syz undup