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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 5.12 290/296] net: hns3: check the return of skb_checksum_help()
Date:   Mon, 31 May 2021 15:15:45 +0200
Message-Id: <20210531130713.457954250@linuxfoundation.org>
In-Reply-To: <20210531130703.762129381@linuxfoundation.org>
References: <20210531130703.762129381@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
@@ -840,8 +840,6 @@ static bool hns3_tunnel_csum_bug(struct
 	      l4.udp->dest == htons(4790))))
 		return false;
 
-	skb_checksum_help(skb);
-
 	return true;
 }
 
@@ -919,8 +917,7 @@ static int hns3_set_l2l3l4(struct sk_buf
 			/* 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);
 		}
 
 		hns3_set_outer_l2l3l4(skb, ol4_proto, ol_type_vlan_len_msec);
@@ -965,7 +962,7 @@ static int hns3_set_l2l3l4(struct sk_buf
 		break;
 	case IPPROTO_UDP:
 		if (hns3_tunnel_csum_bug(skb))
-			break;
+			return skb_checksum_help(skb);
 
 		hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L4CS_B, 1);
 		hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L4T_S,
@@ -990,8 +987,7 @@ static int hns3_set_l2l3l4(struct sk_buf
 		/* 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;