[PATCH] net: Set trailer iff skb1 is the last one

Set trailer iff skb1 is the skbuff where the tailbits space begins.

Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
---
 net/core/skbuff.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 0b24aed04060..18ed56316e56 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c

@@ -4488,8 +4488,9 @@ int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
                        skb1 = skb2;
                }
                elt++;
-               *trailer = skb1;
                skb_p = &skb1->next;
+               if (!*skb_p)
+                       *trailer = skb1;