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

Chao Yu via Linux-f2fs-devel
2026-03-04T01:07:14Z

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 <chao@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