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memory leak in adfs_init_fs_context

Status: upstream: reported C repro on 2025/12/13 19:01
Subsystems: fs
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+1c70732df5fd4f0e4fbb@syzkaller.appspotmail.com
First crash: 182d, last: 107d
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
e57eff95-b7e9-43db-891b-a620b0406441 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ memory leak in adfs_init_fs_context 2026/05/25 02:14 2026/05/25 02:14 2026/05/25 03:00 c69befb30ac10e158cc9d1557b508ee3f0eca1de
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] adfs: fix memory leak in sb->s_fs_info 8 (8) 2025/12/15 03:14
[syzbot] [fs?] memory leak in adfs_init_fs_context 0 (6) 2025/12/14 23:39
▶ ▼ Last patch testing requests (7)
Created Duration User Patch Repo Result
2026/05/08 04:16 26m retest repro upstream error
2026/02/22 21:29 1h27m retest repro upstream report log
2025/12/14 23:39 30m eraykrdg1@gmail.com patch upstream OK log
2025/12/14 22:27 15m eraykrdg1@gmail.com patch upstream error
2025/12/14 21:58 19m eraykrdg1@gmail.com patch upstream error
2025/12/14 20:59 14m eraykrdg1@gmail.com upstream report log
2025/12/13 22:36 21m eraykrdg1@gmail.com patch upstream OK log

Sample crash report:
BUG: memory leak
unreferenced object 0xffff888126345900 (size 64):
  comm "syz.0.18", pid 6076, jiffies 4294944529
  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 c0 01 3f 00 00 00 00 00  ..........?.....
  backtrace (crc 45941a6b):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4953 [inline]
    slab_alloc_node mm/slub.c:5258 [inline]
    __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5766
    kmalloc_noprof include/linux/slab.h:957 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    adfs_init_fs_context+0x26/0xe0 fs/adfs/super.c:440
    alloc_fs_context+0x2a0/0x6e0 fs/fs_context.c:315
    do_new_mount fs/namespace.c:3692 [inline]
    path_mount+0x93f/0x1320 fs/namespace.c:4022
    do_mount fs/namespace.c:4035 [inline]
    __do_sys_mount fs/namespace.c:4224 [inline]
    __se_sys_mount fs/namespace.c:4201 [inline]
    __x64_sys_mount+0x1a2/0x1e0 fs/namespace.c:4201
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888126345f40 (size 64):
  comm "syz.0.19", pid 6079, jiffies 4294944531
  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 c0 01 3f 00 00 00 00 00  ..........?.....
  backtrace (crc 45941a6b):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4953 [inline]
    slab_alloc_node mm/slub.c:5258 [inline]
    __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5766
    kmalloc_noprof include/linux/slab.h:957 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    adfs_init_fs_context+0x26/0xe0 fs/adfs/super.c:440
    alloc_fs_context+0x2a0/0x6e0 fs/fs_context.c:315
    do_new_mount fs/namespace.c:3692 [inline]
    path_mount+0x93f/0x1320 fs/namespace.c:4022
    do_mount fs/namespace.c:4035 [inline]
    __do_sys_mount fs/namespace.c:4224 [inline]
    __se_sys_mount fs/namespace.c:4201 [inline]
    __x64_sys_mount+0x1a2/0x1e0 fs/namespace.c:4201
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff88812636ad40 (size 64):
  comm "syz.0.20", pid 6128, jiffies 4294945167
  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 c0 01 3f 00 00 00 00 00  ..........?.....
  backtrace (crc 45941a6b):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4953 [inline]
    slab_alloc_node mm/slub.c:5258 [inline]
    __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5766
    kmalloc_noprof include/linux/slab.h:957 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    adfs_init_fs_context+0x26/0xe0 fs/adfs/super.c:440
    alloc_fs_context+0x2a0/0x6e0 fs/fs_context.c:315
    do_new_mount fs/namespace.c:3692 [inline]
    path_mount+0x93f/0x1320 fs/namespace.c:4022
    do_mount fs/namespace.c:4035 [inline]
    __do_sys_mount fs/namespace.c:4224 [inline]
    __se_sys_mount fs/namespace.c:4201 [inline]
    __x64_sys_mount+0x1a2/0x1e0 fs/namespace.c:4201
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff888126345b40 (size 64):
  comm "syz.0.21", pid 6129, jiffies 4294945168
  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 c0 01 3f 00 00 00 00 00  ..........?.....
  backtrace (crc 45941a6b):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4953 [inline]
    slab_alloc_node mm/slub.c:5258 [inline]
    __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5766
    kmalloc_noprof include/linux/slab.h:957 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    adfs_init_fs_context+0x26/0xe0 fs/adfs/super.c:440
    alloc_fs_context+0x2a0/0x6e0 fs/fs_context.c:315
    do_new_mount fs/namespace.c:3692 [inline]
    path_mount+0x93f/0x1320 fs/namespace.c:4022
    do_mount fs/namespace.c:4035 [inline]
    __do_sys_mount fs/namespace.c:4224 [inline]
    __se_sys_mount fs/namespace.c:4201 [inline]
    __x64_sys_mount+0x1a2/0x1e0 fs/namespace.c:4201
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

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

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/09 18:51 upstream cb015814f8b6 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in adfs_init_fs_context
* Struck through repros no longer work on HEAD.