linux-kernel - [PATCH AUTOSEL 5.10 21/27] nvme-tcp: fix possible use-after-free in transport error

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Date:   Wed,  9 Feb 2022 13:40:57 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Sagi Grimberg <sagi@...mberg.me>, Chris Leech <cleech@...hat.com>,
        Sasha Levin <sashal@...nel.org>, kbusch@...nel.org,
        axboe@...com, linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.10 21/27] nvme-tcp: fix possible use-after-free in transport error_recovery work

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

[ Upstream commit ff9fc7ebf5c06de1ef72a69f9b1ab40af8b07f9e ]

While nvme_tcp_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.

Tested-by: Chris Leech <cleech@...hat.com>
Signed-off-by: Sagi Grimberg <sagi@...mberg.me>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/tcp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index e99d439894187..45b3a919ac281 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -2069,6 +2069,7 @@ static void nvme_tcp_error_recovery_work(struct work_struct *work)
 	struct nvme_ctrl *ctrl = &tcp_ctrl->ctrl;
 
 	nvme_stop_keep_alive(ctrl);
+	flush_work(&ctrl->async_event_work);
 	nvme_tcp_teardown_io_queues(ctrl, false);
 	/* unquiesce to fail fast pending requests */
 	nvme_start_queues(ctrl);
-- 
2.34.1