1 files changed, 5 insertions, 2 deletions

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 34432b4e96bb..ce88293a34e2 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -843,7 +843,9 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
         skb->network_header   += off;
         if (skb_mac_header_was_set(skb))
                 skb->mac_header += off;
-        skb->csum_start       += nhead;
+        /* Only adjust this if it actually is csum_start rather than csum */
+        if (skb->ip_summed == CHECKSUM_PARTIAL)
+                skb->csum_start += nhead;
         skb->cloned   = 0;
         skb->hdr_len  = 0;
         skb->nohdr    = 0;
@@ -930,7 +932,8 @@ struct sk_buff *skb_copy_expand(const struct sk_buff *skb,
         copy_skb_header(n, skb);
 
         off                  = newheadroom - oldheadroom;
-        n->csum_start       += off;
+        if (n->ip_summed == CHECKSUM_PARTIAL)
+                n->csum_start += off;
 #ifdef NET_SKBUFF_DATA_USES_OFFSET
         n->transport_header += off;
         n->network_header   += off;