From: Jens Axboe <axboe@kernel.dk>
Date: Mon, 2 Jan 2023 23:49:46 +0000 (-0700)
Subject: io_uring/io-wq: free worker if task_work creation is canceled
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=bb135bcc949980e96abd57d7bbeb40d69d380e0c;p=linux.git

io_uring/io-wq: free worker if task_work creation is canceled

commit af82425c6a2d2f347c79b63ce74fca6dc6be157f upstream.

If we cancel the task_work, the worker will never come into existance.
As this is the last reference to it, ensure that we get it freed
appropriately.

Cc: stable@vger.kernel.org
Reported-by: 진호 <wnwlsgh98@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/io_uring/io-wq.c b/io_uring/io-wq.c
index 6031fb319d878..81b5e4462dba4 100644
--- a/io_uring/io-wq.c
+++ b/io_uring/io-wq.c
@@ -1217,6 +1217,7 @@ static void io_wq_cancel_tw_create(struct io_wq *wq)
 
 		worker = container_of(cb, struct io_worker, create_work);
 		io_worker_cancel_cb(worker);
+		kfree(worker);
 	}
 }