linux-kernel - [PATCH AUTOSEL 5.15 42/68] nvmet-tcp: fix memory leak when performing a controller reset

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Date:   Tue, 30 Nov 2021 09:46:38 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Maurizio Lombardi <mlombard@...hat.com>,
        Keith Busch <kbusch@...nel.org>,
        Sagi Grimberg <sagi@...mberg.me>,
        John Meneghini <jmeneghi@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Sasha Levin <sashal@...nel.org>, kch@...dia.com,
        linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.15 42/68] nvmet-tcp: fix memory leak when performing a controller reset

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

[ Upstream commit af21250bb503a02e705b461886321e394b300524 ]

If a reset controller is executed while the initiator
is performing some I/O the driver may leak the memory allocated
for the commands' iovec.

Make sure that nvmet_tcp_uninit_data_in_cmds() releases
all the memory.

Signed-off-by: Maurizio Lombardi <mlombard@...hat.com>
Reviewed-by: Keith Busch <kbusch@...nel.org>
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/target/tcp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/target/tcp.c b/drivers/nvme/target/tcp.c
index 786b1440a9af4..605aa2a8ca536 100644
--- a/drivers/nvme/target/tcp.c
+++ b/drivers/nvme/target/tcp.c
@@ -1427,7 +1427,10 @@ static void nvmet_tcp_uninit_data_in_cmds(struct nvmet_tcp_queue *queue)
 
 	for (i = 0; i < queue->nr_cmds; i++, cmd++) {
 		if (nvmet_tcp_need_data_in(cmd))
-			nvmet_tcp_finish_cmd(cmd);
+			nvmet_req_uninit(&cmd->req);
+
+		nvmet_tcp_unmap_pdu_iovec(cmd);
+		nvmet_tcp_free_cmd_buffers(cmd);
 	}
 
 	if (!queue->nr_cmds && nvmet_tcp_need_data_in(&queue->connect)) {
-- 
2.33.0