net/mlx5: Fix leak upon failure of rule creation

When creation of a new rule that requires allocation of an FTE fails,
need to call to tree_put_node on the FTE in order to release its'
resource.

Fixes: cefc2355 ("net/mlx5: Fix FTE cleanup")
Signed-off-by: NMaor Gottlieb <maorg@nvidia.com>
Reviewed-by: NAlaa Hleihel <alaa@nvidia.com>
Reviewed-by: NMark Bloch <mbloch@nvidia.com>
Signed-off-by: NSaeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/fs_core.c

@@ -1760,6 +1760,7 @@ try_add_to_existing_fg(struct mlx5_flow_table *ft,
 		if (!fte_tmp)
 			continue;
 		rule = add_rule_fg(g, spec, flow_act, dest, dest_num, fte_tmp);
+		/* No error check needed here, because insert_fte() is not called */
 		up_write_ref_node(&fte_tmp->node, false);
 		tree_put_node(&fte_tmp->node, false);
 		kmem_cache_free(steering->ftes_cache, fte);
@@ -1812,6 +1813,8 @@ try_add_to_existing_fg(struct mlx5_flow_table *ft,
 		up_write_ref_node(&g->node, false);
 		rule = add_rule_fg(g, spec, flow_act, dest, dest_num, fte);
 		up_write_ref_node(&fte->node, false);
+		if (IS_ERR(rule))
+			tree_put_node(&fte->node, false);
 		return rule;
 	}
 	rule = ERR_PTR(-ENOENT);
@@ -1910,6 +1913,8 @@ _mlx5_add_flow_rules(struct mlx5_flow_table *ft,
 	up_write_ref_node(&g->node, false);
 	rule = add_rule_fg(g, spec, flow_act, dest, dest_num, fte);
 	up_write_ref_node(&fte->node, false);
+	if (IS_ERR(rule))
+		tree_put_node(&fte->node, false);
 	tree_put_node(&g->node, false);
 	return rule;