[GIT PULL] io_uring fixes for 6.18-rc2

[Jens Axboe <axboe@kernel.dk>]

Hi Linus,

A small set of fixes for io_uring that should go into this release. This
pull request contains:

- Revert of a change that went into an older kernel, and which has been
  reported to cause a regression for some write workloads on LVM while a
  snapshop is being created.

- Fix a regression from this merge window, where some compilers (and/or
  certain .config options) would cause an earlier evaluations of a
  dereference which would then cause a NULL pointer dereference. I was
  only able to reproduce this with OPTIMIZE_FOR_SIZE=y, but David
  Howells hit it with just KASAN enabled. Depending on how things
  inlined, this makes sense.

- Fix for a missing lock around a mem region unregistration.

- Fix for ring resizing with the same placement after resize.

Please pull!


The following changes since commit 3a8660878839faadb4f1a6dd72c3179c1df56787:

  Linux 6.18-rc1 (2025-10-12 13:42:36 -0700)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux.git tags/io_uring-6.18-20251016

for you to fetch changes up to 18d6b1743eafeb3fb1e0ea5a2b7fd0a773d525a8:

  io_uring/rw: check for NULL io_br_sel when putting a buffer (2025-10-15 13:38:53 -0600)

----------------------------------------------------------------
io_uring-6.18-20251016

----------------------------------------------------------------
Jens Axboe (2):
      Revert "io_uring/rw: drop -EOPNOTSUPP check in __io_complete_rw_common()"
      io_uring/rw: check for NULL io_br_sel when putting a buffer

Pavel Begunkov (2):
      io_uring: protect mem region deregistration
      io_uring: fix unexpected placement on same size resizing

 io_uring/register.c | 8 +-------
 io_uring/rw.c       | 8 ++++++--
 2 files changed, 7 insertions(+), 9 deletions(-)

-- 
Jens Axboe