linux-kernel - [PATCH AUTOSEL 5.15 44/68] nvme-tcp: fix memory leak when freeing a queue

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Date:   Tue, 30 Nov 2021 09:46:40 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Maurizio Lombardi <mlombard@...hat.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        John Meneghini <jmeneghi@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Sasha Levin <sashal@...nel.org>, kbusch@...nel.org,
        axboe@...com, linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.15 44/68] nvme-tcp: fix memory leak when freeing a queue

From: Maurizio Lombardi <mlombard@...hat.com>

[ Upstream commit a5053c92b3db71c3f7f9f13934ca620632828d06 ]

Release the page frag cache when tearing down the io queues

Signed-off-by: Maurizio Lombardi <mlombard@...hat.com>
Reviewed-by: Sagi Grimberg <sagi@...mberg.me>
Reviewed-by: John Meneghini <jmeneghi@...hat.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/tcp.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index da733749192c6..f7fdf78ec34db 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -1225,6 +1225,7 @@ static int nvme_tcp_alloc_async_req(struct nvme_tcp_ctrl *ctrl)
 
 static void nvme_tcp_free_queue(struct nvme_ctrl *nctrl, int qid)
 {
+	struct page *page;
 	struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl);
 	struct nvme_tcp_queue *queue = &ctrl->queues[qid];
 
@@ -1234,6 +1235,11 @@ static void nvme_tcp_free_queue(struct nvme_ctrl *nctrl, int qid)
 	if (queue->hdr_digest || queue->data_digest)
 		nvme_tcp_free_crypto(queue);
 
+	if (queue->pf_cache.va) {
+		page = virt_to_head_page(queue->pf_cache.va);
+		__page_frag_cache_drain(page, queue->pf_cache.pagecnt_bias);
+		queue->pf_cache.va = NULL;
+	}
 	sock_release(queue->sock);
 	kfree(queue->pdu);
 	mutex_destroy(&queue->send_mutex);
-- 
2.33.0