[TCP] Allow len == skb->len in tcp_fragment

It is legitimate to call tcp_fragment with len == skb->len since
that is done for FIN packets and the FIN flag counts as one byte.
So we should only check for the len > skb->len case.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>

1 files changed, 1 insertions, 11 deletions

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 7114031fdc70..b907456a79f4 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -435,17 +435,7 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len, unsigned int mss
         int nsize, old_factor;
         u16 flags;
 
-        if (unlikely(len >= skb->len)) {
-                if (net_ratelimit()) {
-                        printk(KERN_DEBUG "TCP: seg_size=%u, mss=%u, seq=%u, "
-                               "end_seq=%u, skb->len=%u.\n", len, mss_now,
-                               TCP_SKB_CB(skb)->seq, TCP_SKB_CB(skb)->end_seq,
-                               skb->len);
-                        WARN_ON(1);
-                }
-                return 0;
-        }
-
+        BUG_ON(len > skb->len);
         nsize = skb_headlen(skb) - len;
         if (nsize < 0)
                 nsize = 0;