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

[Chao Yu]

On 2026/3/4 08:35, Eric Biggers wrote:

On Tue, Mar 03, 2026 at 02:25:37PM -0800, syzbot wrote:

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

The following commit added a call to f2fs_setup_filename() without a
matching call to f2fs_free_filename():

     commit 40b2d55e045222dd6de2a54a299f682e0f954b03
     Author: Chao Yu <c...@kernel.org>
     Date:   Wed Feb 7 15:05:48 2024 +0800

         f2fs: fix to create selinux label during whiteout initialization

Chao, do you want to handle fixing this?

Oh, my bad, let me fix this ASAP.

Thanks Eric for the reminder.

Thanks,

- Eric