1 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv4/ipvs/ip_vs_proto_tcp.c b/net/ipv4/ipvs/ip_vs_proto_tcp.c
index de8ed73997c7..808e8be0280a 100644
--- a/net/ipv4/ipvs/ip_vs_proto_tcp.c
+++ b/net/ipv4/ipvs/ip_vs_proto_tcp.c
@@ -166,7 +166,7 @@ tcp_snat_handler(struct sk_buff *skb,
         tcph->source = cp->vport;
 
         /* Adjust TCP checksums */
-        if (!cp->app) {
+        if (!cp->app && (tcph->check != 0)) {
                 /* Only port and addr are changed, do fast csum update */
                 tcp_fast_csum_update(cp->af, tcph, &cp->daddr, &cp->vaddr,
                                      cp->dport, cp->vport);
@@ -235,7 +235,7 @@ tcp_dnat_handler(struct sk_buff *skb,
         /*
          *      Adjust TCP checksums
          */
-        if (!cp->app) {
+        if (!cp->app && (tcph->check != 0)) {
                 /* Only port and addr are changed, do fast csum update */
                 tcp_fast_csum_update(cp->af, tcph, &cp->vaddr, &cp->daddr,
                                      cp->vport, cp->dport);