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Message-Id: <20220209183759.47134-28-sashal@kernel.org>
Date: Wed, 9 Feb 2022 13:37:51 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Sagi Grimberg <sagi@...mberg.me>, Sasha Levin <sashal@...nel.org>,
kbusch@...nel.org, axboe@...com, linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.15 28/36] nvme-rdma: fix possible use-after-free in transport error_recovery work
From: Sagi Grimberg <sagi@...mberg.me>
[ Upstream commit b6bb1722f34bbdbabed27acdceaf585d300c5fd2 ]
While nvme_rdma_submit_async_event_work is checking the ctrl and queue
state before preparing the AER command and scheduling io_work, in order
to fully prevent a race where this check is not reliable the error
recovery work must flush async_event_work before continuing to destroy
the admin queue after setting the ctrl state to RESETTING such that
there is no race .submit_async_event and the error recovery handler
itself changing the ctrl state.
Signed-off-by: Sagi Grimberg <sagi@...mberg.me>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/nvme/host/rdma.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 0498801542eb6..d51f52e296f50 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -1192,6 +1192,7 @@ static void nvme_rdma_error_recovery_work(struct work_struct *work)
struct nvme_rdma_ctrl, err_work);
nvme_stop_keep_alive(&ctrl->ctrl);
+ flush_work(&ctrl->ctrl.async_event_work);
nvme_rdma_teardown_io_queues(ctrl, false);
nvme_start_queues(&ctrl->ctrl);
nvme_rdma_teardown_admin_queue(ctrl, false);
--
2.34.1
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