[PATCH v3 0/3] f2fs: fix dentry recovery and MAIN_AREA validation

[Cheng Yongkang]

v3:
- Add the missing Fixes trailers to 1/3 and 3/3; 2/3 already carried its
  Fixes tag in v2.
- Add Cc: stable@xxxxxxxxxxxxxxx to each fix.  No code change from v2.

v2:
- Rebase patch 1/3 onto current f2fs dev.  recover_dentry() now takes a
  struct f2fs_cached_block and sets dir from fsync_entry->inode; the
  S_ISDIR() check is unchanged.
- Patches 2/3 and 3/3 are unchanged.

This series fixes three independent issues found while validating crafted
f2fs images:

1. reject a non-directory i_pino during dentry recovery;
2. reject MAIN_AREA boundary underflow in the alignment fix;
3. refresh the superblock CRC after that alignment fix.

Each patch is a single logical change and compiles on its own.  All three
were validated in QEMU on the KASAN kernel: baseline trigger, patched
no-trigger or clean rejection, and a normal filesystem mount/write/fsck
regression.  The baseline source and build were restored and
hash-verified after each run.  The series applies cleanly to f2fs dev
(fd106ada4dee).

Cheng Yongkang (3):
  f2fs: reject non-directory parent inode during dentry recovery
  f2fs: reject MAIN_AREA boundary underflow
  f2fs: refresh superblock CRC after MAIN_AREA alignment fix

 fs/f2fs/recovery.c |  7 +++++++
 fs/f2fs/super.c    | 13 +++++++++++++
 2 files changed, 20 insertions(+)

--
2.34.1