commit 83c65cd436718667e87e61d235f88c073ffd20f7
author Greg Kroah-Hartman <gregkh@linuxfoundation.org> Fri Jul 27 13:58:53 2018 +0200
committer Shirle Yuen <shirleyshukyee@google.com> Mon Aug 27 14:35:26 2018 -0700
tree 313ee7a92721b989d17ab936de376fc95d1df4ad
parent 820042b195245ea29089596a37d3725089f7ca06

Fix backport of "tcp: detect malicious patterns in tcp_collapse_ofo_queue()"

Based on review from Eric Dumazet, my backport of commit
3d4bf93ac12003f9b8e1e2de37fe27983deebdcf to older kernels was a bit
incorrect.  This patch fixes this.

Reported-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
(cherry picked from commit 7a77ef209cfb4e760c70e56bc5fdeaed8f34ed45)

net/ipv4/tcp_input.c

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index f166525..c5fa41a 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4822,6 +4822,7 @@
 			/* Start new segment */
 			start = TCP_SKB_CB(skb)->seq;
 			end = TCP_SKB_CB(skb)->end_seq;
+			range_truesize = skb->truesize;
 		} else {
 			if (before(TCP_SKB_CB(skb)->seq, start))
 				start = TCP_SKB_CB(skb)->seq;