CVE-2025-22127

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix potential deadloop in prepare_compress_overwrite()

Jan Prusakowski reported a kernel hang issue as below:

When running xfstests on linux-next kernel (6.14.0-rc3, 6.12) I

encountered a problem in generic/475 test where fsstress process

gets blocked in __f2fs_write_data_pages() and the test hangs.

The options I used are:

MKFS_OPTIONS -- -O compression -O extra_attr -O project_quota -O quota /dev/vdc

MOUNT_OPTIONS -- -o acl,user_xattr -o discard,compress_extension=* /dev/vdc /vdc

INFO: task kworker/u8:0:11 blocked for more than 122 seconds.

Not tainted 6.14.0-rc3-xfstests-lockdep #1

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

task:kworker/u8:0 state:D stack:0 pid:11 tgid:11 ppid:2 task_flags:0x4208160 flags:0x00004000

Workqueue: writeback wb_workfn (flush-253:0)

Call Trace:

<TASK>

__schedule+0x309/0x8e0

schedule+0x3a/0x100

schedule_preempt_disabled+0x15/0x30

__mutex_lock+0x59a/0xdb0

__f2fs_write_data_pages+0x3ac/0x400

do_writepages+0xe8/0x290

__writeback_single_inode+0x5c/0x360

writeback_sb_inodes+0x22f/0x570

wb_writeback+0xb0/0x410

wb_do_writeback+0x47/0x2f0

wb_workfn+0x5a/0x1c0

process_one_work+0x223/0x5b0

worker_thread+0x1d5/0x3c0

kthread+0xfd/0x230

ret_from_fork+0x31/0x50

ret_from_fork_asm+0x1a/0x30

</TASK>

The root cause is: once generic/475 starts toload error table to dm

device, f2fs_prepare_compress_overwrite() will loop reading compressed

cluster pages due to IO error, meanwhile it has held .writepages lock,

it can block all other writeback tasks.

Let's fix this issue w/ below changes:

- add f2fs_handle_page_eio() in prepare_compress_overwrite() to

detect IO error.

- detect cp_error earler in f2fs_read_multi_pages().