linux-kernel - [PATCH] vdpa/mlx5: Fix erroneous null pointer checks

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Message-Id: <20200806191849.82189-1-alex.dewar90@gmail.com>
Date:   Thu,  6 Aug 2020 20:18:39 +0100
From:   Alex Dewar <alex.dewar90@...il.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Parav Pandit <parav@...lanox.com>,
        Eli Cohen <eli@...lanox.com>,
        Alex Dewar <alex.dewar90@...il.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] vdpa/mlx5: Fix erroneous null pointer checks

In alloc_inout() in net/mlx5_vnet.c, there are a few places where memory
is allocated to *in and *out, but only the values of in and out are
null-checked (i.e. there is a missing dereference). Fix this.

Addresses-Coverity: ("CID 1496603: (REVERSE_INULL)")
Fixes: 1a86b377aa21 ("vdpa/mlx5: Add VDPA driver for supported mlx5 devices")
Signed-off-by: Alex Dewar <alex.dewar90@...il.com>
---
 drivers/vdpa/mlx5/net/mlx5_vnet.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index 3ec44a4f0e45..bcb6600c2839 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -867,7 +867,7 @@ static void alloc_inout(struct mlx5_vdpa_net *ndev, int cmd, void **in, int *inl
 		*outlen = MLX5_ST_SZ_BYTES(qp_2rst_out);
 		*in = kzalloc(*inlen, GFP_KERNEL);
 		*out = kzalloc(*outlen, GFP_KERNEL);
-		if (!in || !out)
+		if (!*in || !*out)
 			goto outerr;
 
 		MLX5_SET(qp_2rst_in, *in, opcode, cmd);
@@ -879,7 +879,7 @@ static void alloc_inout(struct mlx5_vdpa_net *ndev, int cmd, void **in, int *inl
 		*outlen = MLX5_ST_SZ_BYTES(rst2init_qp_out);
 		*in = kzalloc(*inlen, GFP_KERNEL);
 		*out = kzalloc(MLX5_ST_SZ_BYTES(rst2init_qp_out), GFP_KERNEL);
-		if (!in || !out)
+		if (!*in || !*out)
 			goto outerr;
 
 		MLX5_SET(rst2init_qp_in, *in, opcode, cmd);
@@ -896,7 +896,7 @@ static void alloc_inout(struct mlx5_vdpa_net *ndev, int cmd, void **in, int *inl
 		*outlen = MLX5_ST_SZ_BYTES(init2rtr_qp_out);
 		*in = kzalloc(*inlen, GFP_KERNEL);
 		*out = kzalloc(MLX5_ST_SZ_BYTES(init2rtr_qp_out), GFP_KERNEL);
-		if (!in || !out)
+		if (!*in || !*out)
 			goto outerr;
 
 		MLX5_SET(init2rtr_qp_in, *in, opcode, cmd);
@@ -914,7 +914,7 @@ static void alloc_inout(struct mlx5_vdpa_net *ndev, int cmd, void **in, int *inl
 		*outlen = MLX5_ST_SZ_BYTES(rtr2rts_qp_out);
 		*in = kzalloc(*inlen, GFP_KERNEL);
 		*out = kzalloc(MLX5_ST_SZ_BYTES(rtr2rts_qp_out), GFP_KERNEL);
-		if (!in || !out)
+		if (!*in || !*out)
 			goto outerr;
 
 		MLX5_SET(rtr2rts_qp_in, *in, opcode, cmd);
-- 
2.28.0