nvme-rdma: Fix error status return in tagset allocation failure

We should make sure to escelate allocation failures to prevent a
use-after-free in nvmf_create_ctrl.

Fixes: b28a308ee777 ("nvme-rdma: move tagset allocation to a dedicated routine")
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/host/rdma.c

@@ -769,8 +769,10 @@ static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl,
 
 	if (new) {
 		ctrl->ctrl.admin_tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, true);
-		if (IS_ERR(ctrl->ctrl.admin_tagset))
+		if (IS_ERR(ctrl->ctrl.admin_tagset)) {
+			error = PTR_ERR(ctrl->ctrl.admin_tagset);
 			goto out_free_queue;
+		}
 
 		ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
 		if (IS_ERR(ctrl->ctrl.admin_q)) {
@@ -850,8 +852,10 @@ static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new)
 
 	if (new) {
 		ctrl->ctrl.tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, false);
-		if (IS_ERR(ctrl->ctrl.tagset))
+		if (IS_ERR(ctrl->ctrl.tagset)) {
+			ret = PTR_ERR(ctrl->ctrl.tagset);
 			goto out_free_io_queues;
+		}
 
 		ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set);
 		if (IS_ERR(ctrl->ctrl.connect_q)) {