[PATCH 5.0 114/346] nvme-tcp: fix a NULL deref when an admin connect times out

[Greg Kroah-Hartman]

[ Upstream commit 7a42589654ae79e1177f0d74306a02d6cef7bddf ]

If we timeout the admin startup sequence we might not yet have
an I/O tagset allocated which causes the teardown sequence to crash.
Make nvme_tcp_teardown_io_queues safe by not iterating inflight tags
if the tagset wasn't allocated.

Fixes: 39d57757467b ("nvme-tcp: fix timeout handler")
Signed-off-by: Sagi Grimberg <s...@grimberg.me>
Signed-off-by: Christoph Hellwig <h...@lst.de>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/nvme/host/tcp.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 5f0a004252422..e71b0058c57bd 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -1686,7 +1686,9 @@ static void nvme_tcp_teardown_admin_queue(struct 
nvme_ctrl *ctrl,
 {
        blk_mq_quiesce_queue(ctrl->admin_q);
        nvme_tcp_stop_queue(ctrl, 0);
-       blk_mq_tagset_busy_iter(ctrl->admin_tagset, nvme_cancel_request, ctrl);
+       if (ctrl->admin_tagset)
+               blk_mq_tagset_busy_iter(ctrl->admin_tagset,
+                       nvme_cancel_request, ctrl);
        blk_mq_unquiesce_queue(ctrl->admin_q);
        nvme_tcp_destroy_admin_queue(ctrl, remove);
 }
@@ -1698,7 +1700,9 @@ static void nvme_tcp_teardown_io_queues(struct nvme_ctrl 
*ctrl,
                return;
        nvme_stop_queues(ctrl);
        nvme_tcp_stop_io_queues(ctrl);
-       blk_mq_tagset_busy_iter(ctrl->tagset, nvme_cancel_request, ctrl);
+       if (ctrl->tagset)
+               blk_mq_tagset_busy_iter(ctrl->tagset,
+                       nvme_cancel_request, ctrl);
        if (remove)
                nvme_start_queues(ctrl);
        nvme_tcp_destroy_io_queues(ctrl, remove);
-- 
2.20.1