net/bnxt: fix dereference before null check

This patch fixes potential null pointer access in bnxt_alloc_ag_data().
Fix to return an error if null check is true.

Fixes: daef48efe5e5 ("net/bnxt: support set MTU")
Cc: stable@dpdk.org
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>

diff --git a/drivers/net/bnxt/bnxt_rxr.c b/drivers/net/bnxt/bnxt_rxr.c
index f0f9b02..03dae57 100644 (file)
--- a/drivers/net/bnxt/bnxt_rxr.c
+++ b/drivers/net/bnxt/bnxt_rxr.c
@@ -63,18 +63,22 @@ static inline int bnxt_alloc_ag_data(struct bnxt_rx_queue *rxq,
        struct bnxt_sw_rx_bd *rx_buf = &rxr->ag_buf_ring[prod];
        struct rte_mbuf *mbuf;
 
+       if (rxbd == NULL) {
+               PMD_DRV_LOG(ERR, "Jumbo Frame. rxbd is NULL\n");
+               return -EINVAL;
+       }
+
+       if (rx_buf == NULL) {
+               PMD_DRV_LOG(ERR, "Jumbo Frame. rx_buf is NULL\n");
+               return -EINVAL;
+       }
+
        mbuf = __bnxt_alloc_rx_data(rxq->mb_pool);
        if (!mbuf) {
                rte_atomic64_inc(&rxq->rx_mbuf_alloc_fail);
                return -ENOMEM;
        }
 
-       if (rxbd == NULL)
-               PMD_DRV_LOG(ERR, "Jumbo Frame. rxbd is NULL\n");
-       if (rx_buf == NULL)
-               PMD_DRV_LOG(ERR, "Jumbo Frame. rx_buf is NULL\n");
-
-
        rx_buf->mbuf = mbuf;
        mbuf->data_off = RTE_PKTMBUF_HEADROOM;