linux-kernel - [PATCH 5.3 025/197] nvme-rdma: fix possible use-after-free in connect timeout

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Message-Id: <20191027203353.061786254@linuxfoundation.org>
Date:   Sun, 27 Oct 2019 21:59:03 +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, Yi Zhang <yi.zhang@...hat.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.3 025/197] nvme-rdma: fix possible use-after-free in connect timeout

From: Sagi Grimberg <sagi@...mberg.me>

[ Upstream commit 67b483dd03c4cd9e90e4c3943132dce514ea4e88 ]

If the connect times out, we may have already destroyed the
queue in the timeout handler, so test if the queue is still
allocated in the connect error handler.

Reported-by: Yi Zhang <yi.zhang@...hat.com>
Signed-off-by: Sagi Grimberg <sagi@...mberg.me>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/rdma.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index cc1956349a2af..842ef876724f7 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -620,7 +620,8 @@ static int nvme_rdma_start_queue(struct nvme_rdma_ctrl *ctrl, int idx)
 	if (!ret) {
 		set_bit(NVME_RDMA_Q_LIVE, &queue->flags);
 	} else {
-		__nvme_rdma_stop_queue(queue);
+		if (test_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags))
+			__nvme_rdma_stop_queue(queue);
 		dev_info(ctrl->ctrl.device,
 			"failed to connect queue: %d ret=%d\n", idx, ret);
 	}
-- 
2.20.1