From: Salil <salil.mehta@huawei.com>
Date: Fri, 18 Aug 2017 12:31:39 +0100
Subject: net: hns3: Fixes the static check warning due to missing unsupp L3
 proto check
Patch-mainline: v4.14-rc1
Git-commit: 1898d4e404a5f0095071fa3ae178a1d066360fbb
References: bsc#1104353 FATE#326415

This patch fixes the static check warning due to missing handling leg of
unsupported L3 protocol type in the hns3_get_l4_protocol() function.

Fixes: 76ad4f0ee747 ("net: hns3: Add support of HNS3 Ethernet Driver for
hip08 SoC")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c |   14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c
@@ -436,8 +436,8 @@ static int hns3_set_tso(struct sk_buff *
 	return 0;
 }
 
-static void hns3_get_l4_protocol(struct sk_buff *skb, u8 *ol4_proto,
-				 u8 *il4_proto)
+static int hns3_get_l4_protocol(struct sk_buff *skb, u8 *ol4_proto,
+				u8 *il4_proto)
 {
 	union {
 		struct iphdr *v4;
@@ -461,6 +461,8 @@ static void hns3_get_l4_protocol(struct
 					 &l4_proto_tmp, &frag_off);
 	} else if (skb->protocol == htons(ETH_P_IP)) {
 		l4_proto_tmp = l3.v4->protocol;
+	} else {
+		return -EINVAL;
 	}
 
 	*ol4_proto = l4_proto_tmp;
@@ -468,7 +470,7 @@ static void hns3_get_l4_protocol(struct
 	/* tunnel packet */
 	if (!skb->encapsulation) {
 		*il4_proto = 0;
-		return;
+		return 0;
 	}
 
 	/* find inner header point */
@@ -486,6 +488,8 @@ static void hns3_get_l4_protocol(struct
 	}
 
 	*il4_proto = l4_proto_tmp;
+
+	return 0;
 }
 
 static void hns3_set_l2l3l4_len(struct sk_buff *skb, u8 ol4_proto,
@@ -757,7 +761,9 @@ static int hns3_fill_desc(struct hns3_en
 				protocol = vlan_get_protocol(skb);
 				skb->protocol = protocol;
 			}
-			hns3_get_l4_protocol(skb, &ol4_proto, &il4_proto);
+			ret = hns3_get_l4_protocol(skb, &ol4_proto, &il4_proto);
+			if (ret)
+				return ret;
 			hns3_set_l2l3l4_len(skb, ol4_proto, il4_proto,
 					    &type_cs_vlan_tso,
 					    &ol_type_vlan_len_msec);