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memory leak in hfs_init_fs_context

Status: upstream: reported C repro on 2025/11/13 04:27
Subsystems: hfs
[Documentation on labels]
Reported-by: syzbot+ad45f827c88778ff7df6@syzkaller.appspotmail.com
First crash: 60d, last: 2d12h
▶ ▼ Discussions (6)
Title Replies (including bot) Last reply
[PATCH v3 1/2] hfs: ensure sb->s_fs_info is always cleaned up 5 (5) 2025/12/04 12:19
[PATCH v2] fs/hfs: fix s_fs_info leak on setup_bdev_super() failure 28 (28) 2025/12/01 21:57
[PATCH] fs/super: fix memory leak of s_fs_info on setup_bdev_super failure 8 (8) 2025/11/26 14:01
[PATCH] fs/super: fix memory leak of s_fs_info on setup_bdev_super failure 6 (9) 2025/11/19 15:08
[syzbot] [hfs?] memory leak in hfs_init_fs_context 9 (17) 2025/11/19 05:31
1 (2) 2025/11/14 00:21
▶ ▼ Last patch testing requests (13)
Created Duration User Patch Repo Result
2026/01/08 10:19 24m retest repro upstream report log
2025/11/25 05:06 23m retest repro upstream report log
2025/11/19 14:16 20m brauner@kernel.org https://github.com/brauner/linux.git work.hfs.fixes OK log
2025/11/19 13:43 15m brauner@kernel.org https://github.com/brauner/linux.git work.hfs.fixes error
2025/11/19 04:32 23m mehdi.benhadjkhelifa@gmail.com patch upstream OK log
2025/11/18 18:22 0m mehdi.benhadjkhelifa@gmail.com patch upstream error
2025/11/18 17:27 29m mehdi.benhadjkhelifa@gmail.com patch upstream OK log
2025/11/18 16:00 30m mehdi.benhadjkhelifa@gmail.com patch upstream OK log
2025/11/14 15:02 20m mehdi.benhadjkhelifa@gmail.com patch upstream error
2025/11/14 04:12 13m mehdi.benhadjkhelifa@gmail.com patch upstream error
2025/11/14 02:18 21m mehdi.benhadjkhelifa@gmail.com patch upstream OK log
2025/11/14 00:25 49m mehdi.benhadjkhelifa@gmail.com patch upstream error
2025/11/13 23:22 44m mehdi.benhadjkhelifa@gmail.com patch upstream error

Sample crash report:
BUG: memory leak
unreferenced object 0xffff888109400600 (size 512):
  comm "syz.0.17", pid 6095, jiffies 4294942887
  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 00 00 00 00 00 00 00  ................
  backtrace (crc 4c2359fc):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5771
    kmalloc_noprof include/linux/slab.h:957 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    hfs_init_fs_context+0x24/0xd0 fs/hfs/super.c:411
    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 0xffff888111f8d800 (size 512):
  comm "syz.0.18", pid 6098, jiffies 4294942888
  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 00 00 00 00 00 00 00  ................
  backtrace (crc 4c2359fc):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5771
    kmalloc_noprof include/linux/slab.h:957 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    hfs_init_fs_context+0x24/0xd0 fs/hfs/super.c:411
    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 0xffff888111f13400 (size 512):
  comm "syz.0.19", pid 6100, jiffies 4294942890
  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 00 00 00 00 00 00 00  ................
  backtrace (crc 4c2359fc):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5771
    kmalloc_noprof include/linux/slab.h:957 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    hfs_init_fs_context+0x24/0xd0 fs/hfs/super.c:411
    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 0xffff88810b0c5400 (size 512):
  comm "syz.0.20", pid 6131, jiffies 4294943471
  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 00 00 00 00 00 00 00  ................
  backtrace (crc 4c2359fc):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5771
    kmalloc_noprof include/linux/slab.h:957 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    hfs_init_fs_context+0x24/0xd0 fs/hfs/super.c:411
    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 0xffff88811281f600 (size 512):
  comm "syz.0.21", pid 6132, jiffies 4294943472
  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 00 00 00 00 00 00 00  ................
  backtrace (crc 4c2359fc):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5771
    kmalloc_noprof include/linux/slab.h:957 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    hfs_init_fs_context+0x24/0xd0 fs/hfs/super.c:411
    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 (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/25 09:06 upstream ccd1cdca5cd4 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in hfs_init_fs_context
2025/11/11 04:59 upstream 4ea7c1717f3f 4e1406b4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-leak memory leak in hfs_init_fs_context
* Struck through repros no longer work on HEAD.