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nvmet-rdma: Fix possible NULL deref when handling rdma cm events 

When we initiate queue teardown sequence we call rdma_destroy_qp
which clears cm_id->qp, afterwards we call rdma_destroy_id, but
we might see a rdma_cm event in between with a cleared cm_id->qp
so watch out for that and silently ignore the event because this
means that the queue teardown sequence is in progress.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
This commit is contained in:
Bart Van Assche 2016-11-01 18:36:46 +02:00 committed by Sagi Grimberg
parent a25f0944ba
commit fa14a0acea
1 changed files with 7 additions and 1 deletions
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8
drivers/nvme/target/rdma.c
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@ -1352,7 +1352,13 @@ static int nvmet_rdma_cm_handler(struct rdma_cm_id *cm_id,
case RDMA_CM_EVENT_ADDR_CHANGE:
case RDMA_CM_EVENT_DISCONNECTED:
case RDMA_CM_EVENT_TIMEWAIT_EXIT:
nvmet_rdma_queue_disconnect(queue);
/*
* We might end up here when we already freed the qp
* which means queue release sequence is in progress,
* so don't get in the way...
*/
if (queue)
nvmet_rdma_queue_disconnect(queue);
break;
case RDMA_CM_EVENT_DEVICE_REMOVAL:
ret = nvmet_rdma_device_removal(cm_id, queue);