[PATCH] net: prestera: flower: fix ruleset leak in prestera_flower_prio_get()

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

prestera_acl_ruleset_lookup() returns the ruleset with its reference
count incremented, and the caller is expected to release it with
prestera_acl_ruleset_put(). prestera_flower_prio_get() only reads the
priority range and returns without dropping the reference, so the
ruleset is never destroyed.

Release the reference after the priorities have been read.

Fixes: 44af95718fed5 ("net: prestera: manage matchall and flower priorities")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
 drivers/net/ethernet/marvell/prestera/prestera_flower.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/marvell/prestera/prestera_flower.c b/drivers/net/ethernet/marvell/prestera/prestera_flower.c
index 58b116cabd48..10d7e149822b 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_flower.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_flower.c
@@ -411,6 +411,8 @@ int prestera_flower_prio_get(struct prestera_flow_block *block, u32 chain_index,
 		return PTR_ERR(ruleset);
 
 	prestera_acl_ruleset_prio_get(ruleset, prio_min, prio_max);
+	prestera_acl_ruleset_put(ruleset);
+
 	return 0;
 }
 
-- 
2.34.1