io_uring: fix openat/openat2 unified prep handling

A previous commit unified how we handle prep for these two functions,
but this means that we check the allowed context (SQPOLL, specifically)
later than we should. Move the ring type checking into the two parent
functions, instead of doing it after we've done some setup work.

Fixes: ec65fea5a8d7 ("io_uring: deduplicate io_openat{,2}_prep()")
Reported-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index f2b1807316765bcc07150b84d9ff2930da7c38b7..e6004b92e5537b8fe05d561eaf95a4cb7d4aebad 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3527,8 +3527,6 @@ static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe
        const char __user *fname;
        int ret;
 
-       if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
-               return -EINVAL;
        if (unlikely(sqe->ioprio || sqe->buf_index))
                return -EINVAL;
        if (unlikely(req->flags & REQ_F_FIXED_FILE))
@@ -3555,6 +3553,8 @@ static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
        u64 flags, mode;
 
+       if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
+               return -EINVAL;
        if (req->flags & REQ_F_NEED_CLEANUP)
                return 0;
        mode = READ_ONCE(sqe->len);
@@ -3569,6 +3569,8 @@ static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
        size_t len;
        int ret;
 
+       if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
+               return -EINVAL;
        if (req->flags & REQ_F_NEED_CLEANUP)
                return 0;
        how = u64_to_user_ptr(READ_ONCE(sqe->addr2));