RDMA v5.16 fourth rc pull request

- Revert the patch fixing the DM related crash causing a widespread
   regression for kernel ULPs. A proper fix just didn't appear this cycle
   due to the holidays
 
 - Missing NULL check on alloc in uverbs
 
 - Double free in rxe error paths
 
 - Fix a new kernel-infoleak report when forming ah_attr's without GRH's in
   ucma
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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:
 "Last pull for 5.16, the reversion has been known for a while now but
  didn't get a proper fix in time. Looks like we will have several
  info-leak bugs to take care of going foward.

   - Revert the patch fixing the DM related crash causing a widespread
     regression for kernel ULPs. A proper fix just didn't appear this
     cycle due to the holidays

   - Missing NULL check on alloc in uverbs

   - Double free in rxe error paths

   - Fix a new kernel-infoleak report when forming ah_attr's without
     GRH's in ucma"

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma:
  RDMA/core: Don't infoleak GRH fields
  RDMA/uverbs: Check for null return of kmalloc_array
  Revert "RDMA/mlx5: Fix releasing unallocated memory in dereg MR flow"
  RDMA/rxe: Prevent double freeing rxe_map_set()

drivers/infiniband/core/uverbs_marshall.c

@@ -66,7 +66,7 @@ void ib_copy_ah_attr_to_user(struct ib_device *device,
 	struct rdma_ah_attr *src = ah_attr;
 	struct rdma_ah_attr conv_ah;
 
-	memset(&dst->grh.reserved, 0, sizeof(dst->grh.reserved));
+	memset(&dst->grh, 0, sizeof(dst->grh));
 
 	if ((ah_attr->type == RDMA_AH_ATTR_TYPE_OPA) &&
 	    (rdma_ah_get_dlid(ah_attr) > be16_to_cpu(IB_LID_PERMISSIVE)) &&

drivers/infiniband/core/uverbs_uapi.c

@@ -447,6 +447,9 @@ static int uapi_finalize(struct uverbs_api *uapi)
 	uapi->num_write_ex = max_write_ex + 1;
 	data = kmalloc_array(uapi->num_write + uapi->num_write_ex,
 			     sizeof(*uapi->write_methods), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
 	for (i = 0; i != uapi->num_write + uapi->num_write_ex; i++)
 		data[i] = &uapi->notsupp_method;
 	uapi->write_methods = data;

drivers/infiniband/hw/mlx5/mlx5_ib.h

@@ -664,6 +664,7 @@ struct mlx5_ib_mr {
 
 	/* User MR data */
 	struct mlx5_cache_ent *cache_ent;
+	struct ib_umem *umem;
 
 	/* This is zero'd when the MR is allocated */
 	union {
@@ -675,7 +676,7 @@ struct mlx5_ib_mr {
 			struct list_head list;
 		};
 
-		/* Used only by kernel MRs */
+		/* Used only by kernel MRs (umem == NULL) */
 		struct {
 			void *descs;
 			void *descs_alloc;
@@ -696,9 +697,8 @@ struct mlx5_ib_mr {
 			int data_length;
 		};
 
-		/* Used only by User MRs */
+		/* Used only by User MRs (umem != NULL) */
 		struct {
-			struct ib_umem *umem;
 			unsigned int page_shift;
 			/* Current access_flags */
 			int access_flags;

drivers/infiniband/hw/mlx5/mr.c

@@ -1904,18 +1904,19 @@ err:
 	return ret;
 }
 
-static void mlx5_free_priv_descs(struct mlx5_ib_mr *mr)
+static void
+mlx5_free_priv_descs(struct mlx5_ib_mr *mr)
 {
-	struct mlx5_ib_dev *dev = to_mdev(mr->ibmr.device);
-	int size = mr->max_descs * mr->desc_size;
+	if (!mr->umem && mr->descs) {
+		struct ib_device *device = mr->ibmr.device;
+		int size = mr->max_descs * mr->desc_size;
+		struct mlx5_ib_dev *dev = to_mdev(device);
 
-	if (!mr->descs)
-		return;
-
-	dma_unmap_single(&dev->mdev->pdev->dev, mr->desc_map, size,
-			 DMA_TO_DEVICE);
-	kfree(mr->descs_alloc);
-	mr->descs = NULL;
+		dma_unmap_single(&dev->mdev->pdev->dev, mr->desc_map, size,
+				 DMA_TO_DEVICE);
+		kfree(mr->descs_alloc);
+		mr->descs = NULL;
+	}
 }
 
 int mlx5_ib_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
@@ -1991,8 +1992,7 @@ int mlx5_ib_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
 	if (mr->cache_ent) {
 		mlx5_mr_cache_free(dev, mr);
 	} else {
-		if (!udata)
-			mlx5_free_priv_descs(mr);
+		mlx5_free_priv_descs(mr);
 		kfree(mr);
 	}
 	return 0;
@@ -2079,6 +2079,7 @@ static struct mlx5_ib_mr *mlx5_ib_alloc_pi_mr(struct ib_pd *pd,
 	if (err)
 		goto err_free_in;
 
+	mr->umem = NULL;
 	kfree(in);
 
 	return mr;
@@ -2205,6 +2206,7 @@ static struct ib_mr *__mlx5_ib_alloc_mr(struct ib_pd *pd,
 	}
 
 	mr->ibmr.device = pd->device;
+	mr->umem = NULL;
 
 	switch (mr_type) {
 	case IB_MR_TYPE_MEM_REG:

drivers/infiniband/sw/rxe/rxe_mr.c

@@ -135,19 +135,19 @@ static int rxe_mr_alloc(struct rxe_mr *mr, int num_buf, int both)
 
 	ret = rxe_mr_alloc_map_set(num_map, &mr->cur_map_set);
 	if (ret)
-		goto err_out;
+		return -ENOMEM;
 
 	if (both) {
 		ret = rxe_mr_alloc_map_set(num_map, &mr->next_map_set);
-		if (ret) {
-			rxe_mr_free_map_set(mr->num_map, mr->cur_map_set);
-			goto err_out;
-		}
+		if (ret)
+			goto err_free;
 	}
 
 	return 0;
 
-err_out:
+err_free:
+	rxe_mr_free_map_set(mr->num_map, mr->cur_map_set);
+	mr->cur_map_set = NULL;
 	return -ENOMEM;
 }
 
@@ -214,7 +214,7 @@ int rxe_mr_init_user(struct rxe_pd *pd, u64 start, u64 length, u64 iova,
 				pr_warn("%s: Unable to get virtual address\n",
 						__func__);
 				err = -ENOMEM;
-				goto err_cleanup_map;
+				goto err_release_umem;
 			}
 
 			buf->addr = (uintptr_t)vaddr;
@@ -237,8 +237,6 @@ int rxe_mr_init_user(struct rxe_pd *pd, u64 start, u64 length, u64 iova,
 
 	return 0;
 
-err_cleanup_map:
-	rxe_mr_free_map_set(mr->num_map, mr->cur_map_set);
 err_release_umem:
 	ib_umem_release(umem);
 err_out: