diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 3573ba9a255558e3be8ea6691103306861838fe2..755e9cddac47eebe516751a55929f4339b576c5f 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1039,6 +1039,21 @@ static inline int pskb_trim(struct sk_buff *skb, unsigned int len)
 	return (len < skb->len) ? __pskb_trim(skb, len) : 0;
 }
 
+/**
+ *	pskb_trim_unique - remove end from a paged unique (not cloned) buffer
+ *	@skb: buffer to alter
+ *	@len: new length
+ *
+ *	This is identical to pskb_trim except that the caller knows that
+ *	the skb is not cloned so we should never get an error due to out-
+ *	of-memory.
+ */
+static inline void pskb_trim_unique(struct sk_buff *skb, unsigned int len)
+{
+	int err = pskb_trim(skb, len);
+	BUG_ON(err);
+}
+
 /**
  *	skb_orphan - orphan a buffer
  *	@skb: buffer to orphan
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 9bf307a2978355bd68fb66d663630b79720db85c..4c20f5546893dc104afd7cdf32dc4f148b38821b 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -947,7 +947,7 @@ int ip_append_data(struct sock *sk,
 				skb_prev->csum = csum_sub(skb_prev->csum,
 							  skb->csum);
 				data += fraggap;
-				skb_trim(skb_prev, maxfraglen);
+				pskb_trim_unique(skb_prev, maxfraglen);
 			}
 
 			copy = datalen - transhdrlen - fraggap;
@@ -1142,7 +1142,7 @@ ssize_t	ip_append_page(struct sock *sk, struct page *page,
 					data, fraggap, 0);
 				skb_prev->csum = csum_sub(skb_prev->csum,
 							  skb->csum);
-				skb_trim(skb_prev, maxfraglen);
+				pskb_trim_unique(skb_prev, maxfraglen);
 			}
 
 			/*
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 69451af6abe7dd2aaff636498eb1894e45f43fc7..4fb47a25291313ea0851a6539bed48a73a97c1c8 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1095,7 +1095,7 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
 				skb_prev->csum = csum_sub(skb_prev->csum,
 							  skb->csum);
 				data += fraggap;
-				skb_trim(skb_prev, maxfraglen);
+				pskb_trim_unique(skb_prev, maxfraglen);
 			}
 			copy = datalen - transhdrlen - fraggap;
 			if (copy < 0) {