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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Yunsheng Lin <linyunsheng@huawei.com>,
        Huazhong Tan <tanhuazhong@huawei.com>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.19 115/116] net: hns3: check the return of skb_checksum_help()
Date:   Mon, 31 May 2021 15:14:51 +0200
Message-Id: <20210531130644.018184394@linuxfoundation.org>
In-Reply-To: <20210531130640.131924542@linuxfoundation.org>
References: <20210531130640.131924542@linuxfoundation.org>
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From: Yunsheng Lin <linyunsheng@huawei.com>

commit 9bb5a495424fd4bfa672eb1f31481248562fa156 upstream.

Currently skb_checksum_help()'s return is ignored, but it may
return error when it fails to allocate memory when linearizing.

So adds checking for the return of skb_checksum_help().

Fixes: 76ad4f0ee747("net: hns3: Add support of HNS3 Ethernet Driver for hip08 SoC")
Fixes: 3db084d28dc0("net: hns3: Fix for vxlan tx checksum bug")
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c |   10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -702,8 +702,6 @@ static bool hns3_tunnel_csum_bug(struct
 	if (!(!skb->encapsulation && l4.udp->dest == htons(IANA_VXLAN_PORT)))
 		return false;
 
-	skb_checksum_help(skb);
-
 	return true;
 }
 
@@ -764,8 +762,7 @@ static int hns3_set_l3l4_type_csum(struc
 			/* the stack computes the IP header already,
 			 * driver calculate l4 checksum when not TSO.
 			 */
-			skb_checksum_help(skb);
-			return 0;
+			return skb_checksum_help(skb);
 		}
 
 		l3.hdr = skb_inner_network_header(skb);
@@ -796,7 +793,7 @@ static int hns3_set_l3l4_type_csum(struc
 		break;
 	case IPPROTO_UDP:
 		if (hns3_tunnel_csum_bug(skb))
-			break;
+			return skb_checksum_help(skb);
 
 		hnae3_set_bit(*type_cs_vlan_tso, HNS3_TXD_L4CS_B, 1);
 		hnae3_set_field(*type_cs_vlan_tso,
@@ -821,8 +818,7 @@ static int hns3_set_l3l4_type_csum(struc
 		/* the stack computes the IP header already,
 		 * driver calculate l4 checksum when not TSO.
 		 */
-		skb_checksum_help(skb);
-		return 0;
+		return skb_checksum_help(skb);
 	}
 
 	return 0;