[git pull] vfs.git fixes

[Al Viro]

	Fairly old DIO bug caught by Andreas (3.10+) and several slightly
younger blk_rq_map_user_iov() bugs, both on map and copy codepaths (Vitaly
and me).

The following changes since commit 8a5776a5f49812d29fe4b2d0a2d71675c3facf3f:

  Linux 4.14-rc4 (2017-10-08 20:53:29 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git for-linus

for you to fetch changes up to 1cfd0ddd82232804e03f3023f6a58b50dfef0574:

  bio_copy_user_iov(): don't ignore ->iov_offset (2017-10-10 23:55:14 -0400)

----------------------------------------------------------------
Al Viro (2):
      more bio_map_user_iov() leak fixes
      bio_copy_user_iov(): don't ignore ->iov_offset

Andreas Gruenbacher (1):
      direct-io: Prevent NULL pointer access in submit_page_section

Vitaly Mayatskikh (1):
      fix unbalanced page refcounting in bio_map_user_iov

 block/bio.c    | 26 +++++++++++++++++++-------
 fs/direct-io.c |  3 ++-
 2 files changed, 21 insertions(+), 8 deletions(-)