[PATCH] infiniband mlx4: potential leaks in __mlx4_ib_modify_qp

[Florin Malita <fmalita@gmail.com>]

Temporarily allocated struct mlx4_qp_context *context is leaked by 
several error paths. The patch takes advantage of the return value 'err' 
being preinitialized to -EINVAL.

Spotted by Coverity (1768).

Signed-off-by: Florin Malita <fmalita@gmail.com>
---

drivers/infiniband/hw/mlx4/qp.c |   12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index b5a24fb..5456bc4 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -742,7 +742,7 @@ static int __mlx4_ib_modify_qp(struct ib_qp *ibqp,
		if (attr->path_mtu < IB_MTU_256 || attr->path_mtu > IB_MTU_4096) {
			printk(KERN_ERR "path MTU (%u) is invalid\n",
			       attr->path_mtu);
-			return -EINVAL;
+			goto out;
		}
		context->mtu_msgmax = (attr->path_mtu << 5) | 31;
	}
@@ -781,10 +781,8 @@ static int __mlx4_ib_modify_qp(struct ib_qp *ibqp,

	if (attr_mask & IB_QP_AV) {
		if (mlx4_set_path(dev, &attr->ah_attr, &context->pri_path,
-				  attr_mask & IB_QP_PORT ? attr->port_num : qp->port)) {
-			err = -EINVAL;
+				  attr_mask & IB_QP_PORT ? attr->port_num : qp->port))
			goto out;
-		}

		optpar |= (MLX4_QP_OPTPAR_PRIMARY_ADDR_PATH |
			   MLX4_QP_OPTPAR_SCHED_QUEUE);
@@ -798,15 +796,15 @@ static int __mlx4_ib_modify_qp(struct ib_qp *ibqp,
	if (attr_mask & IB_QP_ALT_PATH) {
		if (attr->alt_port_num == 0 ||
		    attr->alt_port_num > dev->dev->caps.num_ports)
-			return -EINVAL;
+			goto out;

		if (attr->alt_pkey_index >=
		    dev->dev->caps.pkey_table_len[attr->alt_port_num])
-			return -EINVAL;
+			goto out;

		if (mlx4_set_path(dev, &attr->alt_ah_attr, &context->alt_path,
				  attr->alt_port_num))
-			return -EINVAL;
+			goto out;

		context->alt_path.pkey_index = attr->alt_pkey_index;
		context->alt_path.ackto = attr->alt_timeout << 3;

-
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