diff --git a/net/core/dev.c b/net/core/dev.c
index 3721fbb..24a53d0 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1935,6 +1935,26 @@ static inline int skb_needs_linearize(struct sk_buff *skb,
 					      illegal_highdma(dev, skb))));
 }
 
+static int skb_csum_start_bug(struct sk_buff *skb)
+{
+
+	if (skb->ip_summed == CHECKSUM_PARTIAL) {
+		long csstart;
+		
+		csstart = skb->csum_start - skb_headroom(skb);
+		if (WARN_ON(csstart > skb_headlen(skb))) {
+		    pr_warning("csum_start %u, offset %u, headroom %d, headlen %d, len %d\n",
+			skb->csum_start,
+			skb->csum_offset,
+			skb_headroom(skb),
+			skb_headlen(skb),
+			skb->len);
+		    return 1;
+		}
+	}
+	return 0;
+}
+
 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
 			struct netdev_queue *txq)
 {
@@ -1955,11 +1975,13 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
 		skb_orphan_try(skb);
 
 		if (netif_needs_gso(dev, skb)) {
+			skb_csum_start_bug(skb);
 			if (unlikely(dev_gso_segment(skb)))
 				goto out_kfree_skb;
 			if (skb->next)
 				goto gso;
 		} else {
+			skb_csum_start_bug(skb);
 			if (skb_needs_linearize(skb, dev) &&
 			    __skb_linearize(skb))
 				goto out_kfree_skb;
@@ -1997,7 +2019,12 @@ gso:
 		if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
 			skb_dst_drop(nskb);
 
-		rc = ops->ndo_start_xmit(nskb, dev);
+		if (skb_csum_start_bug(skb)) {
+		    kfree_skb(skb);
+		    rc = NETDEV_TX_OK;
+		} else
+		    rc = ops->ndo_start_xmit(nskb, dev);
+		    
 		if (unlikely(rc != NETDEV_TX_OK)) {
 			if (rc & ~NETDEV_TX_MASK)
 				goto out_kfree_gso_skb;