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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Leon Romanovsky <leonro@mellanox.com>,
	Sasha Levin <sashal@kernel.org>,
	linux-rdma@vger.kernel.org
Subject: [PATCH AUTOSEL 5.4 333/459] RDMA/mlx5: Don't fake udata for kernel path
Date: Fri, 14 Feb 2020 10:59:43 -0500	[thread overview]
Message-ID: <20200214160149.11681-333-sashal@kernel.org> (raw)
In-Reply-To: <20200214160149.11681-1-sashal@kernel.org>

From: Leon Romanovsky <leonro@mellanox.com>

[ Upstream commit 4835709176e8ccf6561abc9f5c405293e008095f ]

Kernel paths must not set udata and provide NULL pointer,
instead of faking zeroed udata struct.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/infiniband/hw/mlx5/main.c | 34 +++++++++++++++----------------
 1 file changed, 16 insertions(+), 18 deletions(-)

diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index e1cfbedefcbc9..9a918db9e8db4 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -829,6 +829,7 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 				struct ib_device_attr *props,
 				struct ib_udata *uhw)
 {
+	size_t uhw_outlen = (uhw) ? uhw->outlen : 0;
 	struct mlx5_ib_dev *dev = to_mdev(ibdev);
 	struct mlx5_core_dev *mdev = dev->mdev;
 	int err = -ENOMEM;
@@ -842,12 +843,12 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 	u64 max_tso;
 
 	resp_len = sizeof(resp.comp_mask) + sizeof(resp.response_length);
-	if (uhw->outlen && uhw->outlen < resp_len)
+	if (uhw_outlen && uhw_outlen < resp_len)
 		return -EINVAL;
 	else
 		resp.response_length = resp_len;
 
-	if (uhw->inlen && !ib_is_udata_cleared(uhw, 0, uhw->inlen))
+	if (uhw && uhw->inlen && !ib_is_udata_cleared(uhw, 0, uhw->inlen))
 		return -EINVAL;
 
 	memset(props, 0, sizeof(*props));
@@ -911,7 +912,7 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 			props->raw_packet_caps |=
 				IB_RAW_PACKET_CAP_CVLAN_STRIPPING;
 
-		if (field_avail(typeof(resp), tso_caps, uhw->outlen)) {
+		if (field_avail(typeof(resp), tso_caps, uhw_outlen)) {
 			max_tso = MLX5_CAP_ETH(mdev, max_lso_cap);
 			if (max_tso) {
 				resp.tso_caps.max_tso = 1 << max_tso;
@@ -921,7 +922,7 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 			}
 		}
 
-		if (field_avail(typeof(resp), rss_caps, uhw->outlen)) {
+		if (field_avail(typeof(resp), rss_caps, uhw_outlen)) {
 			resp.rss_caps.rx_hash_function =
 						MLX5_RX_HASH_FUNC_TOEPLITZ;
 			resp.rss_caps.rx_hash_fields_mask =
@@ -941,9 +942,9 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 			resp.response_length += sizeof(resp.rss_caps);
 		}
 	} else {
-		if (field_avail(typeof(resp), tso_caps, uhw->outlen))
+		if (field_avail(typeof(resp), tso_caps, uhw_outlen))
 			resp.response_length += sizeof(resp.tso_caps);
-		if (field_avail(typeof(resp), rss_caps, uhw->outlen))
+		if (field_avail(typeof(resp), rss_caps, uhw_outlen))
 			resp.response_length += sizeof(resp.rss_caps);
 	}
 
@@ -1066,7 +1067,7 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 						MLX5_MAX_CQ_PERIOD;
 	}
 
-	if (field_avail(typeof(resp), cqe_comp_caps, uhw->outlen)) {
+	if (field_avail(typeof(resp), cqe_comp_caps, uhw_outlen)) {
 		resp.response_length += sizeof(resp.cqe_comp_caps);
 
 		if (MLX5_CAP_GEN(dev->mdev, cqe_compression)) {
@@ -1084,7 +1085,7 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 		}
 	}
 
-	if (field_avail(typeof(resp), packet_pacing_caps, uhw->outlen) &&
+	if (field_avail(typeof(resp), packet_pacing_caps, uhw_outlen) &&
 	    raw_support) {
 		if (MLX5_CAP_QOS(mdev, packet_pacing) &&
 		    MLX5_CAP_GEN(mdev, qos)) {
@@ -1103,7 +1104,7 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 	}
 
 	if (field_avail(typeof(resp), mlx5_ib_support_multi_pkt_send_wqes,
-			uhw->outlen)) {
+			uhw_outlen)) {
 		if (MLX5_CAP_ETH(mdev, multi_pkt_send_wqe))
 			resp.mlx5_ib_support_multi_pkt_send_wqes =
 				MLX5_IB_ALLOW_MPW;
@@ -1116,7 +1117,7 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 			sizeof(resp.mlx5_ib_support_multi_pkt_send_wqes);
 	}
 
-	if (field_avail(typeof(resp), flags, uhw->outlen)) {
+	if (field_avail(typeof(resp), flags, uhw_outlen)) {
 		resp.response_length += sizeof(resp.flags);
 
 		if (MLX5_CAP_GEN(mdev, cqe_compression_128))
@@ -1132,8 +1133,7 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 		resp.flags |= MLX5_IB_QUERY_DEV_RESP_FLAGS_SCAT2CQE_DCT;
 	}
 
-	if (field_avail(typeof(resp), sw_parsing_caps,
-			uhw->outlen)) {
+	if (field_avail(typeof(resp), sw_parsing_caps, uhw_outlen)) {
 		resp.response_length += sizeof(resp.sw_parsing_caps);
 		if (MLX5_CAP_ETH(mdev, swp)) {
 			resp.sw_parsing_caps.sw_parsing_offloads |=
@@ -1153,7 +1153,7 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 		}
 	}
 
-	if (field_avail(typeof(resp), striding_rq_caps, uhw->outlen) &&
+	if (field_avail(typeof(resp), striding_rq_caps, uhw_outlen) &&
 	    raw_support) {
 		resp.response_length += sizeof(resp.striding_rq_caps);
 		if (MLX5_CAP_GEN(mdev, striding_rq)) {
@@ -1170,8 +1170,7 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 		}
 	}
 
-	if (field_avail(typeof(resp), tunnel_offloads_caps,
-			uhw->outlen)) {
+	if (field_avail(typeof(resp), tunnel_offloads_caps, uhw_outlen)) {
 		resp.response_length += sizeof(resp.tunnel_offloads_caps);
 		if (MLX5_CAP_ETH(mdev, tunnel_stateless_vxlan))
 			resp.tunnel_offloads_caps |=
@@ -1192,7 +1191,7 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 				MLX5_IB_TUNNELED_OFFLOADS_MPLS_UDP;
 	}
 
-	if (uhw->outlen) {
+	if (uhw_outlen) {
 		err = ib_copy_to_udata(uhw, &resp, resp.response_length);
 
 		if (err)
@@ -4738,7 +4737,6 @@ static int __get_port_caps(struct mlx5_ib_dev *dev, u8 port)
 	struct ib_device_attr *dprops = NULL;
 	struct ib_port_attr *pprops = NULL;
 	int err = -ENOMEM;
-	struct ib_udata uhw = {.inlen = 0, .outlen = 0};
 
 	pprops = kzalloc(sizeof(*pprops), GFP_KERNEL);
 	if (!pprops)
@@ -4748,7 +4746,7 @@ static int __get_port_caps(struct mlx5_ib_dev *dev, u8 port)
 	if (!dprops)
 		goto out;
 
-	err = mlx5_ib_query_device(&dev->ib_dev, dprops, &uhw);
+	err = mlx5_ib_query_device(&dev->ib_dev, dprops, NULL);
 	if (err) {
 		mlx5_ib_warn(dev, "query_device failed %d\n", err);
 		goto out;
-- 
2.20.1


  parent reply	other threads:[~2020-02-14 17:24 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200214160149.11681-1-sashal@kernel.org>
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 034/459] RDMA/i40iw: fix a potential NULL pointer dereference Sasha Levin
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 039/459] RDMA/netlink: Do not always generate an ACK for some netlink operations Sasha Levin
2020-02-14 15:55 ` [PATCH AUTOSEL 5.4 052/459] IB/core: Let IB core distribute cache update events Sasha Levin
2020-02-14 15:55 ` [PATCH AUTOSEL 5.4 102/459] RDMA/umem: Fix ib_umem_find_best_pgsz() Sasha Levin
2020-02-14 15:55 ` [PATCH AUTOSEL 5.4 103/459] RDMA/cma: Fix unbalanced cm_id reference count during address resolve Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 240/459] RDMA/rxe: Fix error type of mmap_offset Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 256/459] mlx5: work around high stack usage with gcc Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 257/459] RDMA/hns: Avoid printing address of mtt page Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 273/459] RDMA/core: Fix locking in ib_uverbs_event_read Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 274/459] IB/hfi1: Add software counter for ctxt0 seq drop Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 275/459] IB/hfi1: Add RcvShortLengthErrCnt to hfi1stats Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 295/459] RDMA/uverbs: Remove needs_kfree_rcu from uverbs_obj_type_class Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 324/459] IB/srp: Never use immediate data if it is disabled by a user Sasha Levin
2020-02-14 15:59 ` Sasha Levin [this message]
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 338/459] RDMA/uverbs: Verify MR access flags Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 339/459] IB/mlx4: Fix memory leak in add_gid error flow Sasha Levin
2020-02-14 16:01 ` [PATCH AUTOSEL 5.4 421/459] IB/mlx4: Fix leak in id_map_find_del Sasha Levin

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