linux-kernel - [PATCH][for-linus] io_uring: Fix leaked shadow

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Message-Id: <47835fb780667714ba2d21e9a00fe69bc9bbef47.1572203348.git.asml.silence@gmail.com>
Date:   Sun, 27 Oct 2019 22:10:36 +0300
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH][for-linus] io_uring: Fix leaked shadow_req

io_queue_link_head() owns shadow_req after taking it as an argument.
By not freeing it in case of an error, it can leak the request along
with taken ctx->refs.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 fs/io_uring.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index fa83ea2c16ee..5a48687c4efa 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2413,6 +2413,7 @@ static int io_queue_link_head(struct io_ring_ctx *ctx, struct io_kiocb *req,
 	if (ret) {
 		if (ret != -EIOCBQUEUED) {
 			io_free_req(req);
+			__io_free_req(shadow);
 			io_cqring_add_event(ctx, s->sqe->user_data, ret);
 			return 0;
 		}
-- 
2.23.0