[dpdk-stable] [PATCH 1/7] net/bnxt: fix dereference before null check

[Ajit Khaparde]

From: Kalesh AP <kalesh-anakkur.purayil at broadcom.com>

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 at dpdk.org

Signed-off-by: Kalesh AP <kalesh-anakkur.purayil at broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur at broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde at broadcom.com>
---
 drivers/net/bnxt/bnxt_rxr.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/net/bnxt/bnxt_rxr.c b/drivers/net/bnxt/bnxt_rxr.c
index f0f9b020b1..03dae571b6 100644
--- 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;
 
-- 
2.20.1 (Apple Git-117)