[dpdk-stable] [PATCH] net/mlx4: fix drop queue mem alloc failure handle

[Michael Baum <michaelba@mellanox.com>]

The function mlx4_drop_get() creates pointer to a struct mlx4_drop and
if needed allocates by rte_malloc.

If the allocation is failed the function goes to label “error”, and
there does dereference to a null pointer.

Skip resources cleaning when the memory allocation is failed.

Coverity issue: 146206
Coverity issue: 146146
Fixes: d3a7e09234e4 ("net/mlx4: allocate drop flow resources on demand")
Cc: stable@dpdk.org

Signed-off-by: Michael Baum <michaelba@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>
---
 drivers/net/mlx4/mlx4_flow.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/net/mlx4/mlx4_flow.c b/drivers/net/mlx4/mlx4_flow.c
index 793f0b0..2a86382 100644
--- a/drivers/net/mlx4/mlx4_flow.c
+++ b/drivers/net/mlx4/mlx4_flow.c
@@ -980,12 +980,13 @@ struct mlx4_drop {
 	priv->drop = drop;
 	return drop;
 error:
-	if (drop->qp)
-		claim_zero(mlx4_glue->destroy_qp(drop->qp));
-	if (drop->cq)
-		claim_zero(mlx4_glue->destroy_cq(drop->cq));
-	if (drop)
+	if (drop) {
+		if (drop->qp)
+			claim_zero(mlx4_glue->destroy_qp(drop->qp));
+		if (drop->cq)
+			claim_zero(mlx4_glue->destroy_cq(drop->cq));
 		rte_free(drop);
+	}
 	rte_errno = ENOMEM;
 	return NULL;
 }
-- 
1.8.3.1