net/i40e: fix integer overflow

When configuring i40e rx queue, the temporary variable to store max
packet length is not big enough which leads to integer overflow issue.
This patch fixes the issue by removing the variable and using the
expression directly since the variable is only used once.

Fixes: 4861cde46116 ("i40e: new poll mode driver")
Cc: stable@dpdk.org
Signed-off-by: Xiao Zhang <xiao.zhang@intel.com>
Reviewed-by: Xiaolong Ye <xiaolong.ye@intel.com>

diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c
index 09c01f6..40fe4cd 100644 (file)
--- a/drivers/net/i40e/i40e_rxtx.c
+++ b/drivers/net/i40e/i40e_rxtx.c
@@ -2596,7 +2596,7 @@ i40e_rx_queue_config(struct i40e_rx_queue *rxq)
        struct i40e_pf *pf = I40E_VSI_TO_PF(rxq->vsi);
        struct i40e_hw *hw = I40E_VSI_TO_HW(rxq->vsi);
        struct rte_eth_dev_data *data = pf->dev_data;
-       uint16_t buf_size, len;
+       uint16_t buf_size;
 
        buf_size = (uint16_t)(rte_pktmbuf_data_room_size(rxq->mp) -
                RTE_PKTMBUF_HEADROOM);
@@ -2619,8 +2619,9 @@ i40e_rx_queue_config(struct i40e_rx_queue *rxq)
                break;
        }
 
-       len = hw->func_caps.rx_buf_chain_len * rxq->rx_buf_len;
-       rxq->max_pkt_len = RTE_MIN(len, data->dev_conf.rxmode.max_rx_pkt_len);
+       rxq->max_pkt_len =
+               RTE_MIN((uint32_t)(hw->func_caps.rx_buf_chain_len *
+                       rxq->rx_buf_len), data->dev_conf.rxmode.max_rx_pkt_len);
        if (data->dev_conf.rxmode.offloads & DEV_RX_OFFLOAD_JUMBO_FRAME) {
                if (rxq->max_pkt_len <= RTE_ETHER_MAX_LEN ||
                        rxq->max_pkt_len > I40E_FRAME_SIZE_MAX) {