netdev - [PATCH v2 net-next 08/10] net: ocelot: return error if rule is not found

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Date:   Tue,  2 Jun 2020 13:18:26 +0800
From:   Xiaoliang Yang <xiaoliang.yang_1@....com>
To:     xiaoliang.yang_1@....com, po.liu@....com, claudiu.manoil@....com,
        alexandru.marginean@....com, vladimir.oltean@....com,
        leoyang.li@....com, mingkai.hu@....com, andrew@...n.ch,
        f.fainelli@...il.com, vivien.didelot@...il.com,
        davem@...emloft.net, jiri@...nulli.us, idosch@...sch.org,
        kuba@...nel.org, vinicius.gomes@...el.com,
        nikolay@...ulusnetworks.com, roopa@...ulusnetworks.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        horatiu.vultur@...rochip.com, alexandre.belloni@...tlin.com,
        allan.nielsen@...rochip.com, joergen.andreasen@...rochip.com,
        UNGLinuxDriver@...rochip.com, linux-devel@...ux.nxdi.nxp.com
Subject: [PATCH v2 net-next 08/10] net: ocelot: return error if rule is not found

Return error if rule is not found in rule list to avoid Kernel panic.

Signed-off-by: Xiaoliang Yang <xiaoliang.yang_1@....com>
---
 drivers/net/ethernet/mscc/ocelot_ace.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mscc/ocelot_ace.c b/drivers/net/ethernet/mscc/ocelot_ace.c
index bf2b7a03c832..2ba2859fa2cd 100644
--- a/drivers/net/ethernet/mscc/ocelot_ace.c
+++ b/drivers/net/ethernet/mscc/ocelot_ace.c
@@ -982,9 +982,9 @@ static int ocelot_ace_rule_get_index_id(struct ocelot_acl_block *block,
 	list_for_each_entry(tmp, &block->rules, list) {
 		++index;
 		if (rule->id == tmp->id)
-			break;
+			return index;
 	}
-	return index;
+	return -ENOENT;
 }
 
 static struct ocelot_ace_rule*
@@ -1197,6 +1197,8 @@ int ocelot_ace_rule_offload_del(struct ocelot *ocelot, int block_id,
 
 	/* Gets index of the rule */
 	index = ocelot_ace_rule_get_index_id(block, rule);
+	if (index < 0)
+		return -ENOENT;
 
 	/* Delete rule */
 	ocelot_ace_rule_del(ocelot, block, rule);
@@ -1221,6 +1223,9 @@ int ocelot_ace_rule_stats_update(struct ocelot *ocelot, int block_id,
 	int index;
 
 	index = ocelot_ace_rule_get_index_id(block, rule);
+	if (index < 0)
+		return -ENOENT;
+
 	vcap_entry_get(ocelot, rule, index, block_id);
 
 	/* After we get the result we need to clear the counters */
-- 
2.17.1