1 --- a/include/linux/skbuff.h
2 +++ b/include/linux/skbuff.h
3 @@ -1850,12 +1850,15 @@ static inline int skb_clone_writable(con
4 static inline int __skb_cow(struct sk_buff *skb, unsigned int headroom,
7 + unsigned int alloc_headroom = headroom;
10 if (headroom < NET_SKB_PAD)
11 - headroom = NET_SKB_PAD;
12 - if (headroom > skb_headroom(skb))
13 + alloc_headroom = NET_SKB_PAD;
14 + if (headroom > skb_headroom(skb) ||
15 + (cloned && alloc_headroom > skb_headroom(skb))) {
16 delta = headroom - skb_headroom(skb);
20 return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0,