diff --git a/net/core/datagram.c b/net/core/datagram.c
index 4e07eaef9949..2b2ed1ae5b63 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -779,7 +779,8 @@ __sum16 __skb_checksum_complete_head(struct sk_buff *skb, int len)
 		    !skb->csum_complete_sw)
 			netdev_rx_csum_fault(skb->dev);
 	}
-	skb->csum_valid = !sum;
+	if (!skb_shared(skb))
+		skb->csum_valid = !sum;
 	return sum;
 }
 EXPORT_SYMBOL(__skb_checksum_complete_head);
@@ -799,11 +800,13 @@ __sum16 __skb_checksum_complete(struct sk_buff *skb)
 			netdev_rx_csum_fault(skb->dev);
 	}
 
-	/* Save full packet checksum */
-	skb->csum = csum;
-	skb->ip_summed = CHECKSUM_COMPLETE;
-	skb->csum_complete_sw = 1;
-	skb->csum_valid = !sum;
+	if (!skb_shared(skb)) {
+		/* Save full packet checksum */
+		skb->csum = csum;
+		skb->ip_summed = CHECKSUM_COMPLETE;
+		skb->csum_complete_sw = 1;
+		skb->csum_valid = !sum;
+	}
 
 	return sum;
 }