io_uring: use right task for exiting checks

commit 9c6882608bce249a8918744ecdb65748534e3f17 upstream.

When we use delayed_work for fallback execution of requests, current
will be not of the submitter task, and so checks in io_req_task_submit()
may not behave as expected. Currently, it leaves inline completions not
flushed, so making io_ring_exit_work() to hang. Use the submitter task
for all those checks.

Cc: stable@vger.kernel.org
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/cb413c715bed0bc9c98b169059ea9c8a2c770715.1625881431.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 58ac04cca587fe479996b24536fceb0135ee2fb4..5f15d6fde103ec7a944023fca8a061b6ee7b7034 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2023,7 +2023,7 @@ static void __io_req_task_submit(struct io_kiocb *req)
 
        /* ctx stays valid until unlock, even if we drop all ours ctx->refs */
        mutex_lock(&ctx->uring_lock);
-       if (!(current->flags & PF_EXITING) && !current->in_execve)
+       if (!(req->task->flags & PF_EXITING) && !req->task->in_execve)
                __io_queue_sqe(req);
        else
                __io_req_task_cancel(req, -EFAULT);