[PATCH 03/23] net/nfp: fix dereference of null pointer

[Chaoyong He <chaoyong.he@corigine.com>]

From: Peng Zhang <peng.zhang@corigine.com>

The original logic can not make sure the 'repr' pointer has
valid value and the dereference of null pointer will cause
a segment fault problem.

Fixes: eae7dadbe987 ("net/nfp: update link status reporting")
Cc: james.hershaw@corigine.com
Cc: stable@dpdk.org

Signed-off-by: Peng Zhang <peng.zhang@corigine.com>
Reviewed-by: Chaoyong He <chaoyong.he@corigine.com>
Reviewed-by: Long Wu <long.wu@corigine.com>
---
 drivers/net/nfp/flower/nfp_flower_ctrl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/nfp/flower/nfp_flower_ctrl.c b/drivers/net/nfp/flower/nfp_flower_ctrl.c
index de6e419cac..8cfafe91c8 100644
--- a/drivers/net/nfp/flower/nfp_flower_ctrl.c
+++ b/drivers/net/nfp/flower/nfp_flower_ctrl.c
@@ -441,6 +441,11 @@ nfp_flower_cmsg_port_mod_rx(struct nfp_app_fw_flower *app_fw_flower,
 		return -EINVAL;
 	}
 
+	if (repr == NULL) {
+		PMD_DRV_LOG(ERR, "Can not get 'repr' for port %#x", port);
+		return -EINVAL;
+	}
+
 	repr->link.link_duplex = RTE_ETH_LINK_FULL_DUPLEX;
 	if ((msg->info & NFP_FLOWER_CMSG_PORT_MOD_INFO_LINK) != 0)
 		repr->link.link_status = RTE_ETH_LINK_UP;
-- 
2.39.1