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io_uring: defer msg-ring file validity check until command issue 

In preparation for not using the file at prep time, defer checking if this
file refers to a valid io_uring instance until issue time.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2022-03-29 10:43:56 -06:00
parent 9666d4206e
commit 3f1d52abf0
1 changed files with 7 additions and 4 deletions
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11
fs/io_uring.c
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@ -4473,9 +4473,6 @@ static int io_msg_ring_prep(struct io_kiocb *req,
sqe->splice_fd_in || sqe->buf_index || sqe->personality))
return -EINVAL;
if (req->file->f_op != &io_uring_fops)
return -EBADFD;
req->msg.user_data = READ_ONCE(sqe->off);
req->msg.len = READ_ONCE(sqe->len);
return 0;
@ -4485,9 +4482,14 @@ static int io_msg_ring(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_ring_ctx *target_ctx;
struct io_msg *msg = &req->msg;
int ret = -EOVERFLOW;
bool filled;
int ret;
ret = -EBADFD;
if (req->file->f_op != &io_uring_fops)
goto done;
ret = -EOVERFLOW;
target_ctx = req->file->private_data;
spin_lock(&target_ctx->completion_lock);
@ -4500,6 +4502,7 @@ static int io_msg_ring(struct io_kiocb *req, unsigned int issue_flags)
ret = 0;
}
done:
if (ret < 0)
req_set_fail(req);
__io_req_complete(req, issue_flags, ret, 0);