IB/mlx4: Fix leaks in __mlx4_ib_modify_qp

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 (CID 1768).

Signed-off-by: Florin Malita <fmalita@gmail.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index b5a24fb..5456bc4 100644 (file)
--- 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;