[PATCH] net: mscc: ocelot: Fix mirror reference leak on VCAP aux resource error

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

When ocelot_vcap_policer_add() fails, the aux resource setup returns
without releasing the mirror reference taken earlier by
ocelot_mirror_get(). The caller drops the filter without calling
ocelot_vcap_filter_del_aux_resources(), so the reference is leaked.

Release the mirror reference before returning the error.

Fixes: c3d427eac90f ("net: mscc: ocelot: establish functions for handling VCAP aux resources")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
 drivers/net/ethernet/mscc/ocelot_vcap.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mscc/ocelot_vcap.c b/drivers/net/ethernet/mscc/ocelot_vcap.c
index 25e533e91d71..c479af2a423f 100644
--- a/drivers/net/ethernet/mscc/ocelot_vcap.c
+++ b/drivers/net/ethernet/mscc/ocelot_vcap.c
@@ -970,8 +970,11 @@ ocelot_vcap_filter_add_aux_resources(struct ocelot *ocelot,
 	if (filter->block_id == VCAP_IS2 && filter->action.police_ena) {
 		ret = ocelot_vcap_policer_add(ocelot, filter->action.pol_ix,
 					      &filter->action.pol);
-		if (ret)
+		if (ret) {
+			if (filter->action.mirror_ena)
+				ocelot_mirror_put(ocelot);
 			return ret;
+		}
 	}
 
 	return 0;
-- 
2.34.1