Merge tag 'ovl-fixes-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs

Pull overlayfs fixes from Amir Goldstein:

 - Fixes for bugs found by Chris Mason's AI review, several of them
   reachable by unprivileged users: an info leak, use-after-free and
   NULL deref bugs, an RCU walk stall with remote layers and data loss
   with nfs_export

 - Fix copy up of files with an empty security.capability xattr, which
   any user could set to block copy up

 - Fix a regression from v6.16 with the override_creds mount option

 - Two casefold fixes

* tag 'ovl-fixes-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs:
  ovl: check the casefold flag of directories only
  ovl: reserve space for the casefolded name terminator
  ovl: fix mount setup failing when override_creds drops CAP_SYS_ADMIN
  selftests/ovl: fix detached layer mountinfo expectations
  ovl: set the revalidate flags after d_instantiate()
  ovl: always encode the origin fh when index is enabled
  ovl: read the nlink xattr of every indexed non-dir
  ovl: skip copy up of empty security.capability
  ovl: fix a torn path in ovl_get_redirect()
  ovl: do not copy up a dentry that was removed
  ovl: hold a reference on the parent in readdir
  ovl: use the pinned upper dir in ovl_fix_origin()
  ovl: do not take a name snapshot in RCU walk
  vfs: add try_take_dentry_name_snapshot()
  ovl: take a snapshot of the name for copy up
  ovl: check that the parents of volatile/dirty are dirs
  ovl: add assertions in dir cache code
  ovl: set OVL_WHITEOUTS before publishing the upper dir
  ovl: fortify ovl_copy_xattr() against underlying layer modifications
  ovl: do not copy up an xattr value that was never read

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