f2fs: fix to avoid accessing uninitialized curseg

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

f2fs: fix to avoid accessing uninitialized curseg

syzbot reports a f2fs bug as below:

F2FS-fs (loop3): Stopped filesystem due to reason: 7

kworker/u8:7: attempt to access beyond end of device

BUG: unable to handle page fault for address: ffffed1604ea3dfa

RIP: 0010:get_ckpt_valid_blocks fs/f2fs/segment.h:361 [inline]

RIP: 0010:has_curseg_enough_space fs/f2fs/segment.h:570 [inline]

RIP: 0010:__get_secs_required fs/f2fs/segment.h:620 [inline]

RIP: 0010:has_not_enough_free_secs fs/f2fs/segment.h:633 [inline]

RIP: 0010:has_enough_free_secs+0x575/0x1660 fs/f2fs/segment.h:649

<TASK>

f2fs_is_checkpoint_ready fs/f2fs/segment.h:671 [inline]

f2fs_write_inode+0x425/0x540 fs/f2fs/inode.c:791

write_inode fs/fs-writeback.c:1525 [inline]

__writeback_single_inode+0x708/0x10d0 fs/fs-writeback.c:1745

writeback_sb_inodes+0x820/0x1360 fs/fs-writeback.c:1976

wb_writeback+0x413/0xb80 fs/fs-writeback.c:2156

wb_do_writeback fs/fs-writeback.c:2303 [inline]

wb_workfn+0x410/0x1080 fs/fs-writeback.c:2343

process_one_work kernel/workqueue.c:3236 [inline]

process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317

worker_thread+0x870/0xd30 kernel/workqueue.c:3398

kthread+0x7a9/0x920 kernel/kthread.c:464

ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148

ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Commit 8b10d3653735 ("f2fs: introduce FAULT_NO_SEGMENT") allows to trigger

no free segment fault in allocator, then it will update curseg->segno to

NULL_SEGNO, though, CP_ERROR_FLAG has been set, f2fs_write_inode() missed

to check the flag, and access invalid curseg->segno directly in below call

path, then resulting in panic:

- f2fs_write_inode

- f2fs_is_checkpoint_ready

- has_enough_free_secs

- has_not_enough_free_secs

- __get_secs_required

- has_curseg_enough_space

- get_ckpt_valid_blocks

: access invalid curseg->segno

To avoid this issue, let's:

- check CP_ERROR_FLAG flag in prior to f2fs_is_checkpoint_ready() in

f2fs_write_inode().

- in has_curseg_enough_space(), save curseg->segno into a temp variable,

and verify its validation before use.