tcp: Fix order of tests in tcp_retransmit_skb()
tcp_write_queue_next() must only be made if we know that
tcp_skb_is_last() evaluates to false.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index c3d58ee..a8499ef 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1932,8 +1932,8 @@
/* Collapse two adjacent packets if worthwhile and we can. */
if (!(TCP_SKB_CB(skb)->flags & TCPCB_FLAG_SYN) &&
(skb->len < (cur_mss >> 1)) &&
- (tcp_write_queue_next(sk, skb) != tcp_send_head(sk)) &&
(!tcp_skb_is_last(sk, skb)) &&
+ (tcp_write_queue_next(sk, skb) != tcp_send_head(sk)) &&
(skb_shinfo(skb)->nr_frags == 0 &&
skb_shinfo(tcp_write_queue_next(sk, skb))->nr_frags == 0) &&
(tcp_skb_pcount(skb) == 1 &&