tcp: force mss equality with the next skb too.

Also make if-goto forest nicer looking.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 5 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index d67b6e9cc540..63c3ef6d4a1c 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1575,11 +1575,10 @@ static struct sk_buff *tcp_shift_skb_data(struct sock *sk, struct sk_buff *skb,
                 goto out;
         skb = tcp_write_queue_next(sk, prev);
 
-        if (!skb_can_shift(skb))
-                goto out;
-        if (skb == tcp_send_head(sk))
-                goto out;
-        if ((TCP_SKB_CB(skb)->sacked & TCPCB_TAGBITS) != TCPCB_SACKED_ACKED)
+        if (!skb_can_shift(skb) ||
+            (skb == tcp_send_head(sk)) ||
+            ((TCP_SKB_CB(skb)->sacked & TCPCB_TAGBITS) != TCPCB_SACKED_ACKED) ||
+            (mss != tcp_shift_mss(skb)))
                 goto out;
 
         len = skb->len;