netdev - [PATCH -next] xen-netback: fix some error return code

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Date:	Mon, 16 Dec 2013 13:49:29 +0800
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	ian.campbell@...rix.com, wei.liu2@...rix.com
Cc:	yongjun_wei@...ndmicro.com.cn, xen-devel@...ts.xenproject.org,
	netdev@...r.kernel.org
Subject: [PATCH -next] xen-netback: fix some error return code

From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>

Fix to return -EPROTO error code instead of 0(overwrite by maybe_pull_tail())
if skb_partial_csum_set() return false.

Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
---
 drivers/net/xen-netback/netback.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 800496b..b16daa7 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1108,8 +1108,10 @@ static int checksum_setup_ip(struct xenvif *vif, struct sk_buff *skb,
 			goto out;
 
 		if (!skb_partial_csum_set(skb, off,
-					  offsetof(struct tcphdr, check)))
+					  offsetof(struct tcphdr, check))) {
+			err = -EPROTO;
 			goto out;
+		}
 
 		if (recalculate_partial_csum)
 			tcp_hdr(skb)->check =
@@ -1126,8 +1128,10 @@ static int checksum_setup_ip(struct xenvif *vif, struct sk_buff *skb,
 			goto out;
 
 		if (!skb_partial_csum_set(skb, off,
-					  offsetof(struct udphdr, check)))
+					  offsetof(struct udphdr, check))) {
+			err = -EPROTO;
 			goto out;
+		}
 
 		if (recalculate_partial_csum)
 			udp_hdr(skb)->check =
@@ -1249,8 +1253,10 @@ static int checksum_setup_ipv6(struct xenvif *vif, struct sk_buff *skb,
 			goto out;
 
 		if (!skb_partial_csum_set(skb, off,
-					  offsetof(struct tcphdr, check)))
+					  offsetof(struct tcphdr, check))) {
+			err = -EPROTO;
 			goto out;
+		}
 
 		if (recalculate_partial_csum)
 			tcp_hdr(skb)->check =
@@ -1267,8 +1273,10 @@ static int checksum_setup_ipv6(struct xenvif *vif, struct sk_buff *skb,
 			goto out;
 
 		if (!skb_partial_csum_set(skb, off,
-					  offsetof(struct udphdr, check)))
+					  offsetof(struct udphdr, check))) {
+			err = -EPROTO;
 			goto out;
+		}
 
 		if (recalculate_partial_csum)
 			udp_hdr(skb)->check =

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