[PATCH] net: exit immediately when off = 0 in skb_headers_offset_update()

[Miaohe Lin]

In the case of off = 0, skb_headers_offset_update() do nothing indeed.

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

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 18ed56316e56..f67f0da20a5b 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1459,6 +1459,8 @@ EXPORT_SYMBOL(skb_clone);
 
 void skb_headers_offset_update(struct sk_buff *skb, int off)
 {
+	if (unlikely(off == 0))
+		return;
 	/* Only adjust this if it actually is csum_start rather than csum */
 	if (skb->ip_summed == CHECKSUM_PARTIAL)
 		skb->csum_start += off;
-- 
2.19.1