[PATCH] mlxsw: spectrum_flower: Fix port range register leak

[Wentao Liang <vulab@iscas.ac.cn>]

mlxsw_sp_flower_parse_ports_range() acquires the source port range
register before the destination one.  If the destination lookup then
fails, the source register reference is left behind in a partially
filled rule info, and callers that pass a stack allocated rule info
never release it.  Release the source register before returning the
error so that the reference is not leaked.

Fixes: fe22f7410527 ("mlxsw: spectrum_flower: Add ability to match on port ranges")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
index 353fd9ca89a6..4cad6c46b07e 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
@@ -486,8 +486,14 @@ mlxsw_sp_flower_parse_ports_range(struct mlxsw_sp *mlxsw_sp,
 
 		err = mlxsw_sp_port_range_reg_get(mlxsw_sp, &range,
 						  f->common.extack, &prr_index);
-		if (err)
+		if (err) {
+			if (rulei->src_port_range_reg_valid) {
+				mlxsw_sp_port_range_reg_put(mlxsw_sp,
+							    rulei->src_port_range_reg_index);
+				rulei->src_port_range_reg_valid = false;
+			}
 			return err;
+		}
 
 		rulei->dst_port_range_reg_index = prr_index;
 		rulei->dst_port_range_reg_valid = true;
-- 
2.34.1