linux-kernel - [PATCH 5.4 43/76] nvmet-rdma: Fix list_del corruption on queue establishment failure

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Message-Id: <20210118113343.051562876@linuxfoundation.org>
Date:   Mon, 18 Jan 2021 12:34:43 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Israel Rukshin <israelr@...dia.com>,
        Max Gurtovoy <mgurtovoy@...dia.com>,
        Christoph Hellwig <hch@....de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 43/76] nvmet-rdma: Fix list_del corruption on queue establishment failure

From: Israel Rukshin <israelr@...dia.com>

[ Upstream commit 9ceb7863537748c67fa43ac4f2f565819bbd36e4 ]

When a queue is in NVMET_RDMA_Q_CONNECTING state, it may has some
requests at rsp_wait_list. In case a disconnect occurs at this
state, no one will empty this list and will return the requests to
free_rsps list. Normally nvmet_rdma_queue_established() free those
requests after moving the queue to NVMET_RDMA_Q_LIVE state, but in
this case __nvmet_rdma_queue_disconnect() is called before. The
crash happens at nvmet_rdma_free_rsps() when calling
list_del(&rsp->free_list), because the request exists only at
the wait list. To fix the issue, simply clear rsp_wait_list when
destroying the queue.

Signed-off-by: Israel Rukshin <israelr@...dia.com>
Reviewed-by: Max Gurtovoy <mgurtovoy@...dia.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/target/rdma.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c
index b5314164479e9..50e2007092bc0 100644
--- a/drivers/nvme/target/rdma.c
+++ b/drivers/nvme/target/rdma.c
@@ -1351,6 +1351,16 @@ static void __nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue)
 	spin_lock_irqsave(&queue->state_lock, flags);
 	switch (queue->state) {
 	case NVMET_RDMA_Q_CONNECTING:
+		while (!list_empty(&queue->rsp_wait_list)) {
+			struct nvmet_rdma_rsp *rsp;
+
+			rsp = list_first_entry(&queue->rsp_wait_list,
+					       struct nvmet_rdma_rsp,
+					       wait_list);
+			list_del(&rsp->wait_list);
+			nvmet_rdma_put_rsp(rsp);
+		}
+		fallthrough;
 	case NVMET_RDMA_Q_LIVE:
 		queue->state = NVMET_RDMA_Q_DISCONNECTING;
 		disconnect = true;
-- 
2.27.0