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authorSagi Grimberg <sagi@grimberg.me>2019-04-24 21:53:17 +0300
committerChristoph Hellwig <hch@lst.de>2019-04-25 17:51:37 +0300
commit7a42589654ae79e1177f0d74306a02d6cef7bddf (patch)
treec556c34ee4aa676beacbff402f7e11ecf54f7cfb /drivers/nvme
parent569b3d3db1aac8586a16df1745c9e5a99ff47253 (diff)
downloadlinux-7a42589654ae79e1177f0d74306a02d6cef7bddf.tar.xz
nvme-tcp: fix a NULL deref when an admin connect times out
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 <sagi@grimberg.me> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme')
-rw-r--r--drivers/nvme/host/tcp.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 68c49dd67210..aae5374d2b93 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -1710,7 +1710,9 @@ 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);
}
@@ -1722,7 +1724,9 @@ 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);