[dpdk-dev] [PATCH v2] net/mlx5: fix using flow tunnel before null check

[wangyunjian <wangyunjian@huawei.com>]

From: Yunjian Wang <wangyunjian@huawei.com>

Coverity flags that 'ctx->tunnel' variable is used before
it's checked for NULL. This patch fixes this issue.

Coverity issue: 366201
Fixes: 868d2e342cf3 ("net/mlx5: fix tunnel offload hub multi-thread protection")
Cc: stable@dpdk.org

Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
---
v2:
  add cc: stable@dpdk.org
---
 drivers/net/mlx5/mlx5_flow.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index d46fc333d1..bb8d09cdef 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -7899,10 +7899,11 @@ static void get_tunnel_miss(struct rte_eth_dev *dev, void *x)
 
 	rte_spinlock_unlock(&thub->sl);
 	ctx->tunnel = mlx5_flow_tunnel_allocate(dev, ctx->app_tunnel);
-	ctx->tunnel->refctn = 1;
 	rte_spinlock_lock(&thub->sl);
-	if (ctx->tunnel)
+	if (ctx->tunnel) {
+		ctx->tunnel->refctn = 1;
 		LIST_INSERT_HEAD(&thub->tunnels, ctx->tunnel, chain);
+	}
 }
 
 
-- 
2.23.0