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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: 9d15h, last: 9d15h
▶ ▼ Discussions (5)
Title Replies (including bot) Last reply
[PATCH v2] fs/hfs: fix s_fs_info leak on setup_bdev_super() failure 6 (6) 2025/11/19 22:24
[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
[PATCH] fs/super: fix memory leak of s_fs_info on setup_bdev_super failure 7 (7) 2025/11/18 18:05
1 (2) 2025/11/14 00:21
▶ ▼ Last patch testing requests (11)
Created Duration User Patch Repo Result
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 0xffff888111778c00 (size 512):
  comm "syz.0.17", pid 6092, jiffies 4294942644
  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 eb1d7412):
    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]
    hfs_init_fs_context+0x24/0xd0 fs/hfs/super.c:411
    alloc_fs_context+0x214/0x430 fs/fs_context.c:315
    do_new_mount fs/namespace.c:3707 [inline]
    path_mount+0x93c/0x12e0 fs/namespace.c:4037
    do_mount fs/namespace.c:4050 [inline]
    __do_sys_mount fs/namespace.c:4238 [inline]
    __se_sys_mount fs/namespace.c:4215 [inline]
    __x64_sys_mount+0x1a2/0x1e0 fs/namespace.c:4215
    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 0xffff88810a2e8800 (size 512):
  comm "syz.0.18", pid 6098, jiffies 4294942646
  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 eb1d7412):
    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]
    hfs_init_fs_context+0x24/0xd0 fs/hfs/super.c:411
    alloc_fs_context+0x214/0x430 fs/fs_context.c:315
    do_new_mount fs/namespace.c:3707 [inline]
    path_mount+0x93c/0x12e0 fs/namespace.c:4037
    do_mount fs/namespace.c:4050 [inline]
    __do_sys_mount fs/namespace.c:4238 [inline]
    __se_sys_mount fs/namespace.c:4215 [inline]
    __x64_sys_mount+0x1a2/0x1e0 fs/namespace.c:4215
    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 0xffff88810a2e8e00 (size 512):
  comm "syz.0.19", pid 6102, jiffies 4294942648
  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 eb1d7412):
    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]
    hfs_init_fs_context+0x24/0xd0 fs/hfs/super.c:411
    alloc_fs_context+0x214/0x430 fs/fs_context.c:315
    do_new_mount fs/namespace.c:3707 [inline]
    path_mount+0x93c/0x12e0 fs/namespace.c:4037
    do_mount fs/namespace.c:4050 [inline]
    __do_sys_mount fs/namespace.c:4238 [inline]
    __se_sys_mount fs/namespace.c:4215 [inline]
    __x64_sys_mount+0x1a2/0x1e0 fs/namespace.c:4215
    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 0xffff8881263ed600 (size 512):
  comm "syz.0.20", pid 6125, jiffies 4294943177
  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 eb1d7412):
    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]
    hfs_init_fs_context+0x24/0xd0 fs/hfs/super.c:411
    alloc_fs_context+0x214/0x430 fs/fs_context.c:315
    do_new_mount fs/namespace.c:3707 [inline]
    path_mount+0x93c/0x12e0 fs/namespace.c:4037
    do_mount fs/namespace.c:4050 [inline]
    __do_sys_mount fs/namespace.c:4238 [inline]
    __se_sys_mount fs/namespace.c:4215 [inline]
    __x64_sys_mount+0x1a2/0x1e0 fs/namespace.c:4215
    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 0xffff88810db18c00 (size 512):
  comm "syz.0.21", pid 6127, jiffies 4294943179
  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 eb1d7412):
    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]
    hfs_init_fs_context+0x24/0xd0 fs/hfs/super.c:411
    alloc_fs_context+0x214/0x430 fs/fs_context.c:315
    do_new_mount fs/namespace.c:3707 [inline]
    path_mount+0x93c/0x12e0 fs/namespace.c:4037
    do_mount fs/namespace.c:4050 [inline]
    __do_sys_mount fs/namespace.c:4238 [inline]
    __se_sys_mount fs/namespace.c:4215 [inline]
    __x64_sys_mount+0x1a2/0x1e0 fs/namespace.c:4215
    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

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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.