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--- a/include/linux/skbuff.h
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+++ b/include/linux/skbuff.h
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@@ -1850,12 +1850,15 @@ static inline int skb_clone_writable(con
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static inline int __skb_cow(struct sk_buff *skb, unsigned int headroom,
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int cloned)
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{
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+ unsigned int alloc_headroom = headroom;
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int delta = 0;
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if (headroom < NET_SKB_PAD)
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- headroom = NET_SKB_PAD;
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- if (headroom > skb_headroom(skb))
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- delta = headroom - skb_headroom(skb);
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+ alloc_headroom = NET_SKB_PAD;
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+ if (headroom > skb_headroom(skb) ||
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+ (cloned && alloc_headroom > skb_headroom(skb))) {
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+ delta = alloc_headroom - skb_headroom(skb);
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+ }
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if (delta || cloned)
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return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0,
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