xen-netback: fix some error return code

'err' is overwrited to 0 after maybe_pull_tail() call, so the error
code was not set if skb_partial_csum_set() call failed. Fix to return
error -EPROTO from those error handling case instead of 0.

Fixes: d52eb0d46f36 ('xen-netback: make sure skb linear area covers checksum field')
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 27bbe58..7b4fd93 100644 (file)
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1209,8 +1209,10 @@ 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 =
@@ -1227,8 +1229,10 @@ 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 =
@@ -1350,8 +1354,10 @@ 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 =
@@ -1368,8 +1374,10 @@ 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 =