io_uring: sanitise ring params earlier

io_uring: sanitise ring params earlier

[ Upstream commit 92a3bac9a57c39728226ab191859c85f5e2829c0 ]

Do all struct io_uring_params validation early on before allocating the
context. That makes initialisation easier, especially by having fewer
places where we need to care about partial de-initialisation.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/363ba90b83ff78eefdc88b60e1b2c4a39d182247.1738344646.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>