[PATCH AUTOSEL 5.10 31/43] nvme-tcp: fix memory leak when freeing a queue

Sasha Levin
2021-11-30T15:06:12Z

[ Upstream commit a5053c92b3db71c3f7f9f13934ca620632828d06 ]

Release the page frag cache when tearing down the io queues

Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: John Meneghini <jmeneghi@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.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 c8efa98192a4f..aaad985175d60 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -1212,6 +1212,7 @@ 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];

@@ -1221,6 +1222,11 @@ 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->queue_lock);
--
2.33.0