[GIT PULL] overlayfs fixes for 6.6-rc5

[Amir Goldstein]

Hi Linus,

Please pull overlayfs fixes for 6.6-rc5.

This branch has been sitting in linux-next for a couple of days and
it has gone through the usual overlayfs test routines.

The branch merges cleanly with master branch of the moment.

Thanks,
Amir.

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The following changes since commit 8a749fd1a8720d4619c91c8b6e7528c0a355c0aa:

  Linux 6.6-rc4 (2023-10-01 14:15:13 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs.git ovl-fixes-6.6-rc5

for you to fetch changes up to c7242a45cb8cad5b6cd840fd4661315b45b1e841:

  ovl: fix NULL pointer defer when encoding non-decodable lower fid (2023-10-03 09:24:11 +0300)

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overlayfs fixes for 6.6-rc5:

- Fix for file reference leak regression from v6.6-rc2

- Fix for NULL pointer deref regression from v6.6-rc1

- Fixes for RCU-walk race regressions from v6.5:

   Two of the fixes were taken from Al's RCU pathwalk race fixes series
   with his concent [1].

   Note that unlike most of Al's series, these two patches are not about
   racing with ->kill_sb() and they are also very recent regressions from
   v6.5, so I think it's worth getting them into v6.5.y.

   There is also a fix for an RCU pathwalk race with ->kill_sb(), which
   may have been solved in vfs generic code as you suggested, but it also
   rids overlayfs from a nasty hack, so I think it's worth anyway.

[1] https://lore.kernel.org/linux-fsdevel/20231003204749.GA800259@ZenIV/

----------------------------------------------------------------
Al Viro (2):
      ovl: move freeing ovl_entry past rcu delay
      ovl: fetch inode once in ovl_dentry_revalidate_common()

Amir Goldstein (3):
      ovl: fix file reference leak when submitting aio
      ovl: make use of ->layers safe in rcu pathwalk
      ovl: fix NULL pointer defer when encoding non-decodable lower fid

 fs/overlayfs/export.c    |  2 +-
 fs/overlayfs/file.c      |  2 --
 fs/overlayfs/ovl_entry.h | 10 +---------
 fs/overlayfs/params.c    | 17 +++++++++--------
 fs/overlayfs/super.c     | 27 +++++++++++++++++----------
 5 files changed, 28 insertions(+), 30 deletions(-)