[syzbot] [fscrypt?] [f2fs?] memory leak in fscrypt_setup_filename

[syzbot <syzbot+cf7946ab25b21abc4b66@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    af4e9ef3d784 uaccess: Fix scoped_user_read_access() for 'p..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12506d5a580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2c6ad6fefffa76b1
dashboard link: https://syzkaller.appspot.com/bug?extid=cf7946ab25b21abc4b66
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=160a18d6580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14e2b0ba580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/70cb2ebe1e6e/disk-af4e9ef3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/945fea3c8a6d/vmlinux-af4e9ef3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/fa6a6a5cbcc8/bzImage-af4e9ef3.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/c12ae92fa9b6/mount_0.gz
  fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=10e1d202580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cf7946ab25b21abc4b66@syzkaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff888127f70830 (size 16):
  comm "syz.0.23", pid 6144, jiffies 4294943712
  hex dump (first 16 bytes):
    3c af 57 72 5b e6 8f ad 6e 8e fd 33 42 39 03 ff  <.Wr[...n..3B9..
  backtrace (crc 925f8a80):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4520 [inline]
    slab_alloc_node mm/slub.c:4844 [inline]
    __do_kmalloc_node mm/slub.c:5237 [inline]
    __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5250
    kmalloc_noprof include/linux/slab.h:954 [inline]
    fscrypt_setup_filename+0x15e/0x3b0 fs/crypto/fname.c:364
    f2fs_setup_filename+0x52/0xb0 fs/f2fs/dir.c:143
    f2fs_rename+0x159/0xca0 fs/f2fs/namei.c:961
    f2fs_rename2+0xd5/0xf20 fs/f2fs/namei.c:1308
    vfs_rename+0x7ff/0x1250 fs/namei.c:6026
    filename_renameat2+0x4f4/0x660 fs/namei.c:6144
    __do_sys_renameat2 fs/namei.c:6173 [inline]
    __se_sys_renameat2 fs/namei.c:6168 [inline]
    __x64_sys_renameat2+0x59/0x80 fs/namei.c:6168
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xe2/0xf80 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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