diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index 010f26b31c89..bac79e817776 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -171,7 +171,7 @@ int inet_frag_queue_insert(struct inet_frag_queue *q, struct sk_buff *skb,
 void *inet_frag_reasm_prepare(struct inet_frag_queue *q, struct sk_buff *skb,
 			      struct sk_buff *parent);
 void inet_frag_reasm_finish(struct inet_frag_queue *q, struct sk_buff *head,
-			    void *reasm_data);
+			    void *reasm_data, bool try_coalesce);
 struct sk_buff *inet_frag_pull_head(struct inet_frag_queue *q);
 
 #endif
diff --git a/net/ieee802154/6lowpan/reassembly.c b/net/ieee802154/6lowpan/reassembly.c
index e4aba5d485be..bbe9b3b2d395 100644
--- a/net/ieee802154/6lowpan/reassembly.c
+++ b/net/ieee802154/6lowpan/reassembly.c
@@ -170,7 +170,7 @@ static int lowpan_frag_reasm(struct lowpan_frag_queue *fq, struct sk_buff *skb,
 	reasm_data = inet_frag_reasm_prepare(&fq->q, skb, prev_tail);
 	if (!reasm_data)
 		goto out_oom;
-	inet_frag_reasm_finish(&fq->q, skb, reasm_data);
+	inet_frag_reasm_finish(&fq->q, skb, reasm_data, false);
 
 	skb->dev = ldev;
 	skb->tstamp = fq->q.stamp;
diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
index a999451345f9..10d31733297d 100644
--- a/net/ipv4/inet_fragment.c
+++ b/net/ipv4/inet_fragment.c
@@ -475,11 +475,12 @@ void *inet_frag_reasm_prepare(struct inet_frag_queue *q, struct sk_buff *skb,
 EXPORT_SYMBOL(inet_frag_reasm_prepare);
 
 void inet_frag_reasm_finish(struct inet_frag_queue *q, struct sk_buff *head,
-			    void *reasm_data)
+			    void *reasm_data, bool try_coalesce)
 {
 	struct sk_buff **nextp = (struct sk_buff **)reasm_data;
 	struct rb_node *rbn;
 	struct sk_buff *fp;
+	int sum_truesize;
 
 	skb_push(head, head->data - skb_network_header(head));
 
@@ -487,25 +488,41 @@ void inet_frag_reasm_finish(struct inet_frag_queue *q, struct sk_buff *head,
 	fp = FRAG_CB(head)->next_frag;
 	rbn = rb_next(&head->rbnode);
 	rb_erase(&head->rbnode, &q->rb_fragments);
+
+	sum_truesize = head->truesize;
 	while (rbn || fp) {
 		/* fp points to the next sk_buff in the current run;
 		 * rbn points to the next run.
 		 */
 		/* Go through the current run. */
 		while (fp) {
-			*nextp = fp;
-			nextp = &fp->next;
-			fp->prev = NULL;
-			memset(&fp->rbnode, 0, sizeof(fp->rbnode));
-			fp->sk = NULL;
-			head->data_len += fp->len;
-			head->len += fp->len;
+			struct sk_buff *next_frag = FRAG_CB(fp)->next_frag;
+			bool stolen;
+			int delta;
+
+			sum_truesize += fp->truesize;
 			if (head->ip_summed != fp->ip_summed)
 				head->ip_summed = CHECKSUM_NONE;
 			else if (head->ip_summed == CHECKSUM_COMPLETE)
 				head->csum = csum_add(head->csum, fp->csum);
-			head->truesize += fp->truesize;
-			fp = FRAG_CB(fp)->next_frag;
+
+			if (try_coalesce && skb_try_coalesce(head, fp, &stolen,
+							     &delta)) {
+				kfree_skb_partial(fp, stolen);
+			} else {
+				fp->prev = NULL;
+				memset(&fp->rbnode, 0, sizeof(fp->rbnode));
+				fp->sk = NULL;
+
+				head->data_len += fp->len;
+				head->len += fp->len;
+				head->truesize += fp->truesize;
+
+				*nextp = fp;
+				nextp = &fp->next;
+			}
+
+			fp = next_frag;
 		}
 		/* Move to the next run. */
 		if (rbn) {
@@ -516,7 +533,7 @@ void inet_frag_reasm_finish(struct inet_frag_queue *q, struct sk_buff *head,
 			rbn = rbnext;
 		}
 	}
-	sub_frag_mem_limit(q->fqdir, head->truesize);
+	sub_frag_mem_limit(q->fqdir, sum_truesize);
 
 	*nextp = NULL;
 	skb_mark_not_on_list(head);
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 4385eb9e781f..cfeb8890f94e 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -393,6 +393,11 @@ static int ip_frag_queue(struct ipq *qp, struct sk_buff *skb)
 	return err;
 }
 
+static bool ip_frag_coalesce_ok(const struct ipq *qp)
+{
+	return qp->q.key.v4.user == IP_DEFRAG_LOCAL_DELIVER;
+}
+
 /* Build a new IP datagram from all its fragments. */
 static int ip_frag_reasm(struct ipq *qp, struct sk_buff *skb,
 			 struct sk_buff *prev_tail, struct net_device *dev)
@@ -421,7 +426,8 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *skb,
 	if (len > 65535)
 		goto out_oversize;
 
-	inet_frag_reasm_finish(&qp->q, skb, reasm_data);
+	inet_frag_reasm_finish(&qp->q, skb, reasm_data,
+			       ip_frag_coalesce_ok(qp));
 
 	skb->dev = dev;
 	IPCB(skb)->frag_max_size = max(qp->max_df_size, qp->q.max_size);
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index 0f82c150543b..fed9666a2f7d 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -348,7 +348,7 @@ static int nf_ct_frag6_reasm(struct frag_queue *fq, struct sk_buff *skb,
 
 	skb_reset_transport_header(skb);
 
-	inet_frag_reasm_finish(&fq->q, skb, reasm_data);
+	inet_frag_reasm_finish(&fq->q, skb, reasm_data, false);
 
 	skb->ignore_df = 1;
 	skb->dev = dev;
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index ca05b16f1bb9..1f5d4d196dcc 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -282,7 +282,7 @@ static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *skb,
 
 	skb_reset_transport_header(skb);
 
-	inet_frag_reasm_finish(&fq->q, skb, reasm_data);
+	inet_frag_reasm_finish(&fq->q, skb, reasm_data, true);
 
 	skb->dev = dev;
 	ipv6_hdr(skb)->payload_len = htons(payload_len);