[PATCH 07/12] net/xsc: avoid potential null pointer before used

[Renyong Wan]

This issue reported by PVS studio, described as:
https://pvs-studio.com/en/docs/warnings/v595/

Signed-off-by: Renyong Wan <wa...@yunsilicon.com>
---
 drivers/net/xsc/xsc_np.c   | 2 +-
 drivers/net/xsc/xsc_rx.c   | 2 +-
 drivers/net/xsc/xsc_vfio.c | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/xsc/xsc_np.c b/drivers/net/xsc/xsc_np.c
index f032a0dbc2..eff7497255 100644
--- a/drivers/net/xsc/xsc_np.c
+++ b/drivers/net/xsc/xsc_np.c
@@ -172,13 +172,13 @@ xsc_dev_np_exec(struct xsc_dev *xdev, void *cmd, int len, 
int table, int opmod)
        out_len = sizeof(struct xsc_np_mbox_out) + data_len;
        cmd_len = RTE_MAX(in_len, out_len);
        in = malloc(cmd_len);
-       memset(in, 0, cmd_len);
        if (in == NULL) {
                rte_errno = ENOMEM;
                PMD_DRV_LOG(ERR, "Failed to alloc np cmd memory");
                return -rte_errno;
        }
 
+       memset(in, 0, cmd_len);
        in->hdr.opcode = rte_cpu_to_be_16(XSC_CMD_OP_EXEC_NP);
        in->len = rte_cpu_to_be_16(data_len);
 
diff --git a/drivers/net/xsc/xsc_rx.c b/drivers/net/xsc/xsc_rx.c
index 140d7728d6..dfb71ed087 100644
--- a/drivers/net/xsc/xsc_rx.c
+++ b/drivers/net/xsc/xsc_rx.c
@@ -296,13 +296,13 @@ xsc_rss_qp_create(struct xsc_ethdev_priv *priv, int 
port_id)
        out_len = sizeof(struct xsc_cmd_create_multiqp_mbox_out) + 
entry_total_len;
        cmd_len = RTE_MAX(in_len, out_len);
        in = malloc(cmd_len);
-       memset(in, 0, cmd_len);
        if (in == NULL) {
                rte_errno = ENOMEM;
                PMD_DRV_LOG(ERR, "Alloc rss qp create cmd memory failed");
                goto error;
        }
 
+       memset(in, 0, cmd_len);
        in->qp_num = rte_cpu_to_be_16((uint16_t)priv->num_rq);
        in->qp_type = XSC_QUEUE_TYPE_RAW;
        in->req_len = rte_cpu_to_be_32(cmd_len);
diff --git a/drivers/net/xsc/xsc_vfio.c b/drivers/net/xsc/xsc_vfio.c
index 6c679449af..2cd796ba26 100644
--- a/drivers/net/xsc/xsc_vfio.c
+++ b/drivers/net/xsc/xsc_vfio.c
@@ -431,13 +431,13 @@ xsc_vfio_rx_cq_create(struct xsc_dev *xdev, struct 
xsc_rx_cq_params *cq_params,
        }
 
        in = malloc(cmd_len);
-       memset(in, 0, cmd_len);
        if (in == NULL) {
                rte_errno = ENOMEM;
                PMD_DRV_LOG(ERR, "Failed to alloc rx cq exec cmd memory");
                goto error;
        }
 
+       memset(in, 0, cmd_len);
        in->hdr.opcode = rte_cpu_to_be_16(XSC_CMD_OP_CREATE_CQ);
        in->ctx.eqn = 0;
        in->ctx.pa_num = rte_cpu_to_be_16(pa_num);
-- 
2.25.1