net/mlx4_en: fix a memory leak bug

[ Upstream commit 48ec701 ]

In mlx4_en_config_rss_steer(), 'rss_map->indir_qp' is allocated through
kzalloc(). After that, mlx4_qp_alloc() is invoked to configure RSS
indirection. However, if mlx4_qp_alloc() fails, the allocated
'rss_map->indir_qp' is not deallocated, leading to a memory leak bug.

To fix the above issue, add the 'qp_alloc_err' label to free
'rss_map->indir_qp'.

Fixes: 4931c6e ("net/mlx4_en: Optimized single ring steering")
Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/net/ethernet/mellanox/mlx4/en_rx.c

@@ -1187,7 +1187,7 @@ int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
  err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, rss_map->indir_qp);
  if (err) {
  en_err(priv, "Failed to allocate RSS indirection QP\n");
- goto rss_err;
+ goto qp_alloc_err;
  }
 
  rss_map->indir_qp->event = mlx4_en_sqp_event;
@@ -1241,6 +1241,7 @@ int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
  MLX4_QP_STATE_RST, NULL, 0, 0, rss_map->indir_qp);
  mlx4_qp_remove(mdev->dev, rss_map->indir_qp);
  mlx4_qp_free(mdev->dev, rss_map->indir_qp);
+qp_alloc_err:
  kfree(rss_map->indir_qp);
  rss_map->indir_qp = NULL;
 rss_err: