From: Chao Leng lengchao@huawei.com
stable inclusion from linux-4.19.155 commit a2631d71e40d1d330729f42b43f6f6f159ef285a
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[ Upstream commit 43efdb8e870ee0f58633fd579aa5b5185bf5d39e ]
A crash can happened when a connect is rejected. The host establishes the connection after received ConnectReply, and then continues to send the fabrics Connect command. If the controller does not receive the ReadyToUse capsule, host may receive a ConnectReject reply.
Call nvme_rdma_destroy_queue_ib after the host received the RDMA_CM_EVENT_REJECTED event. Then when the fabrics Connect command times out, nvme_rdma_timeout calls nvme_rdma_complete_rq to fail the request. A crash happenes due to use after free in nvme_rdma_complete_rq.
nvme_rdma_destroy_queue_ib is redundant when handling the RDMA_CM_EVENT_REJECTED event as nvme_rdma_destroy_queue_ib is already called in connection failure handler.
Signed-off-by: Chao Leng lengchao@huawei.com Reviewed-by: Sagi Grimberg sagi@grimberg.me Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/nvme/host/rdma.c | 1 - 1 file changed, 1 deletion(-)
diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index 3007d3aa08c1..d0cf19e593b2 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -1630,7 +1630,6 @@ static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id, complete(&queue->cm_done); return 0; case RDMA_CM_EVENT_REJECTED: - nvme_rdma_destroy_queue_ib(queue); cm_error = nvme_rdma_conn_rejected(queue, ev); break; case RDMA_CM_EVENT_ROUTE_ERROR: