[dpdk-dev] [PATCH] compress/mlx5: fix QP setup error flow

[Michael Baum]

The QP setup function allocates buffer for its opaque MR and register it
into MR structure.

After buffer alloction and before MR registration, it tries allocate MR
Btree.
When the MR Btree allocation fails, the buffer was not freed what caused
a memory leak.

Allocate the MR Btree before buffer alloction.

Fixes: 0165bccdb45f ("compress/mlx5: add memory region management")
Cc: stable at dpdk.org

Signed-off-by: Michael Baum <michaelba at nvidia.com>
---
 drivers/compress/mlx5/mlx5_compress.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/compress/mlx5/mlx5_compress.c b/drivers/compress/mlx5/mlx5_compress.c
index 883e720ec1..c5e0a83a8c 100644
--- a/drivers/compress/mlx5/mlx5_compress.c
+++ b/drivers/compress/mlx5/mlx5_compress.c
@@ -207,6 +207,13 @@ mlx5_compress_qp_setup(struct rte_compressdev *dev, uint16_t qp_id,
 		return -rte_errno;
 	}
 	dev->data->queue_pairs[qp_id] = qp;
+	if (mlx5_mr_btree_init(&qp->mr_ctrl.cache_bh, MLX5_MR_BTREE_CACHE_N,
+			       priv->dev_config.socket_id)) {
+		DRV_LOG(ERR, "Cannot allocate MR Btree for qp %u.",
+			(uint32_t)qp_id);
+		rte_errno = ENOMEM;
+		goto err;
+	}
 	opaq_buf = rte_calloc(__func__, (size_t)1 << log_ops_n,
 			      sizeof(struct mlx5_gga_compress_opaque),
 			      sizeof(struct mlx5_gga_compress_opaque));
@@ -215,13 +222,6 @@ mlx5_compress_qp_setup(struct rte_compressdev *dev, uint16_t qp_id,
 		rte_errno = ENOMEM;
 		goto err;
 	}
-	if (mlx5_mr_btree_init(&qp->mr_ctrl.cache_bh, MLX5_MR_BTREE_CACHE_N,
-			       priv->dev_config.socket_id)) {
-		DRV_LOG(ERR, "Cannot allocate MR Btree for qp %u.",
-			(uint32_t)qp_id);
-		rte_errno = ENOMEM;
-		goto err;
-	}
 	qp->entries_n = 1 << log_ops_n;
 	qp->socket_id = socket_id;
 	qp->qp_id = qp_id;
-- 
2.25.1