4.18-rc

Regression and crashing bug fixes:
 
 - mlx4/5: Fixes for issues found from various checkers
 - A resource tracking and uverbs regression in the core code
 - qedr: NULL pointer regression found during testing
 - rxe: Various small bugs
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma

Pull rdma fixes from Jason Gunthorpe:
 "Here are eight fairly small fixes collected over the last two weeks.

  Regression and crashing bug fixes:

   - mlx4/5: Fixes for issues found from various checkers

   - A resource tracking and uverbs regression in the core code

   - qedr: NULL pointer regression found during testing

   - rxe: Various small bugs"

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma:
  IB/rxe: Fix missing completion for mem_reg work requests
  RDMA/core: Save kernel caller name when creating CQ using ib_create_cq()
  IB/uverbs: Fix ordering of ucontext check in ib_uverbs_write
  IB/mlx4: Fix an error handling path in 'mlx4_ib_rereg_user_mr()'
  RDMA/qedr: Fix NULL pointer dereference when running over iWARP without RDMA-CM
  IB/mlx5: Fix return value check in flow_counters_set_data()
  IB/mlx5: Fix memory leak in mlx5_ib_create_flow
  IB/rxe: avoid double kfree skb

drivers/infiniband/core/uverbs_main.c

@@ -736,10 +736,6 @@ static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 	if (ret)
 		return ret;
 
-	if (!file->ucontext &&
-	    (command != IB_USER_VERBS_CMD_GET_CONTEXT || extended))
-		return -EINVAL;
-
 	if (extended) {
 		if (count < (sizeof(hdr) + sizeof(ex_hdr)))
 			return -EINVAL;
@@ -759,6 +755,16 @@ static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 		goto out;
 	}
 
+	/*
+	 * Must be after the ib_dev check, as once the RCU clears ib_dev ==
+	 * NULL means ucontext == NULL
+	 */
+	if (!file->ucontext &&
+	    (command != IB_USER_VERBS_CMD_GET_CONTEXT || extended)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
 	if (!verify_command_mask(ib_dev, command, extended)) {
 		ret = -EOPNOTSUPP;
 		goto out;

drivers/infiniband/core/verbs.c

@@ -1562,11 +1562,12 @@ EXPORT_SYMBOL(ib_destroy_qp);
 
 /* Completion queues */
 
-struct ib_cq *ib_create_cq(struct ib_device *device,
-			   ib_comp_handler comp_handler,
-			   void (*event_handler)(struct ib_event *, void *),
-			   void *cq_context,
-			   const struct ib_cq_init_attr *cq_attr)
+struct ib_cq *__ib_create_cq(struct ib_device *device,
+			     ib_comp_handler comp_handler,
+			     void (*event_handler)(struct ib_event *, void *),
+			     void *cq_context,
+			     const struct ib_cq_init_attr *cq_attr,
+			     const char *caller)
 {
 	struct ib_cq *cq;
 
@@ -1580,12 +1581,13 @@ struct ib_cq *ib_create_cq(struct ib_device *device,
 		cq->cq_context    = cq_context;
 		atomic_set(&cq->usecnt, 0);
 		cq->res.type = RDMA_RESTRACK_CQ;
+		cq->res.kern_name = caller;
 		rdma_restrack_add(&cq->res);
 	}
 
 	return cq;
 }
-EXPORT_SYMBOL(ib_create_cq);
+EXPORT_SYMBOL(__ib_create_cq);
 
 int rdma_set_cq_moderation(struct ib_cq *cq, u16 cq_count, u16 cq_period)
 {

drivers/infiniband/hw/mlx4/mr.c

@@ -486,8 +486,11 @@ int mlx4_ib_rereg_user_mr(struct ib_mr *mr, int flags,
 	}
 
 	if (flags & IB_MR_REREG_ACCESS) {
-		if (ib_access_writable(mr_access_flags) && !mmr->umem->writable)
-			return -EPERM;
+		if (ib_access_writable(mr_access_flags) &&
+		    !mmr->umem->writable) {
+			err = -EPERM;
+			goto release_mpt_entry;
+		}
 
 		err = mlx4_mr_hw_change_access(dev->dev, *pmpt_entry,
 					       convert_access(mr_access_flags));

drivers/infiniband/hw/mlx5/main.c

@@ -3199,8 +3199,8 @@ static int flow_counters_set_data(struct ib_counters *ibcounters,
 	if (!mcounters->hw_cntrs_hndl) {
 		mcounters->hw_cntrs_hndl = mlx5_fc_create(
 			to_mdev(ibcounters->device)->mdev, false);
-		if (!mcounters->hw_cntrs_hndl) {
-			ret = -ENOMEM;
+		if (IS_ERR(mcounters->hw_cntrs_hndl)) {
+			ret = PTR_ERR(mcounters->hw_cntrs_hndl);
 			goto free;
 		}
 		hw_hndl = true;
@@ -3546,29 +3546,35 @@ static struct ib_flow *mlx5_ib_create_flow(struct ib_qp *qp,
 			return ERR_PTR(-ENOMEM);
 
 		err = ib_copy_from_udata(ucmd, udata, required_ucmd_sz);
-		if (err) {
-			kfree(ucmd);
-			return ERR_PTR(err);
-		}
+		if (err)
+			goto free_ucmd;
 	}
 
-	if (flow_attr->priority > MLX5_IB_FLOW_LAST_PRIO)
-		return ERR_PTR(-ENOMEM);
+	if (flow_attr->priority > MLX5_IB_FLOW_LAST_PRIO) {
+		err = -ENOMEM;
+		goto free_ucmd;
+	}
 
 	if (domain != IB_FLOW_DOMAIN_USER ||
 	    flow_attr->port > dev->num_ports ||
 	    (flow_attr->flags & ~(IB_FLOW_ATTR_FLAGS_DONT_TRAP |
-				  IB_FLOW_ATTR_FLAGS_EGRESS)))
-		return ERR_PTR(-EINVAL);
+				  IB_FLOW_ATTR_FLAGS_EGRESS))) {
+		err = -EINVAL;
+		goto free_ucmd;
+	}
 
 	if (is_egress &&
 	    (flow_attr->type == IB_FLOW_ATTR_ALL_DEFAULT ||
-	     flow_attr->type == IB_FLOW_ATTR_MC_DEFAULT))
-		return ERR_PTR(-EINVAL);
+	     flow_attr->type == IB_FLOW_ATTR_MC_DEFAULT)) {
+		err = -EINVAL;
+		goto free_ucmd;
+	}
 
 	dst = kzalloc(sizeof(*dst), GFP_KERNEL);
-	if (!dst)
-		return ERR_PTR(-ENOMEM);
+	if (!dst) {
+		err = -ENOMEM;
+		goto free_ucmd;
+	}
 
 	mutex_lock(&dev->flow_db->lock);
 
@@ -3637,8 +3643,8 @@ destroy_ft:
 unlock:
 	mutex_unlock(&dev->flow_db->lock);
 	kfree(dst);
+free_ucmd:
 	kfree(ucmd);
-	kfree(handler);
 	return ERR_PTR(err);
 }
 

drivers/infiniband/hw/qedr/verbs.c

@@ -1957,6 +1957,9 @@ int qedr_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 	}
 
 	if (attr_mask & (IB_QP_AV | IB_QP_PATH_MTU)) {
+		if (rdma_protocol_iwarp(&dev->ibdev, 1))
+			return -EINVAL;
+
 		if (attr_mask & IB_QP_PATH_MTU) {
 			if (attr->path_mtu < IB_MTU_256 ||
 			    attr->path_mtu > IB_MTU_4096) {

drivers/infiniband/sw/rxe/rxe_req.c

@@ -645,6 +645,9 @@ next_wqe:
 		} else {
 			goto exit;
 		}
+		if ((wqe->wr.send_flags & IB_SEND_SIGNALED) ||
+		    qp->sq_sig_type == IB_SIGNAL_ALL_WR)
+			rxe_run_task(&qp->comp.task, 1);
 		qp->req.wqe_index = next_index(qp->sq.queue,
 						qp->req.wqe_index);
 		goto next_wqe;
@@ -709,6 +712,7 @@ next_wqe:
 
 	if (fill_packet(qp, wqe, &pkt, skb, payload)) {
 		pr_debug("qp#%d Error during fill packet\n", qp_num(qp));
+		kfree_skb(skb);
 		goto err;
 	}
 
@@ -740,7 +744,6 @@ next_wqe:
 	goto next_wqe;
 
 err:
-	kfree_skb(skb);
 	wqe->status = IB_WC_LOC_PROT_ERR;
 	wqe->state = wqe_state_error;
 	__rxe_do_task(&qp->comp.task);

include/rdma/ib_verbs.h

@@ -3391,11 +3391,14 @@ int ib_process_cq_direct(struct ib_cq *cq, int budget);
  *
  * Users can examine the cq structure to determine the actual CQ size.
  */
-struct ib_cq *ib_create_cq(struct ib_device *device,
-			   ib_comp_handler comp_handler,
-			   void (*event_handler)(struct ib_event *, void *),
-			   void *cq_context,
-			   const struct ib_cq_init_attr *cq_attr);
+struct ib_cq *__ib_create_cq(struct ib_device *device,
+			     ib_comp_handler comp_handler,
+			     void (*event_handler)(struct ib_event *, void *),
+			     void *cq_context,
+			     const struct ib_cq_init_attr *cq_attr,
+			     const char *caller);
+#define ib_create_cq(device, cmp_hndlr, evt_hndlr, cq_ctxt, cq_attr) \
+	__ib_create_cq((device), (cmp_hndlr), (evt_hndlr), (cq_ctxt), (cq_attr), KBUILD_MODNAME)
 
 /**
  * ib_resize_cq - Modifies the capacity of the CQ.