linux-kernel - [PATCH 5.19 149/192] io_uring: recycle kbuf recycle on tw requeue

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Message-Id: <20220913140417.446810476@linuxfoundation.org>
Date:   Tue, 13 Sep 2022 16:04:15 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pavel Begunkov <asml.silence@...il.com>,
        Jens Axboe <axboe@...nel.dk>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 149/192] io_uring: recycle kbuf recycle on tw requeue

From: Pavel Begunkov <asml.silence@...il.com>

[ Upstream commit 336d28a8f38013a069f2d46e73aaa1880ef17a47 ]

When we queue a request via tw for execution it's not going to be
executed immediately, so when io_queue_async() hits IO_APOLL_READY
and queues a tw but doesn't try to recycle/consume the buffer some other
request may try to use the the buffer.

Fixes: c7fb19428d67 ("io_uring: add support for ring mapped supplied buffers")
Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
Link: https://lore.kernel.org/r/a19bc9e211e3184215a58e129b62f440180e9212.1662480490.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 io_uring/io_uring.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index cd155b7e1346d..effe3570a051f 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -8260,6 +8260,7 @@ static void io_queue_async(struct io_kiocb *req, int ret)
 
 	switch (io_arm_poll_handler(req, 0)) {
 	case IO_APOLL_READY:
+		io_kbuf_recycle(req, 0);
 		io_req_task_queue(req);
 		break;
 	case IO_APOLL_ABORTED:
-- 
2.35.1