UPSTREAM: io_uring: fix races with file table unregister

[ Upstream commit b0380bf6 ]

Fixed file table quiesce might unlock ->uring_lock, potentially letting
new requests to be submitted, don't allow those requests to use the
table as they will race with unregistration.

Reported-and-tested-by: van fantasy <g1042620637@gmail.com>
Fixes: 05f3fb3c ("io_uring: avoid ring quiesce for fixed file set unregister and update")
Change-Id: I6237b05e950faa41672fe77cd33cebf5e57cf13a
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit b1e7cade)
Bug: 268174392
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>