diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index f5aa87e1e0c8c8a8ef4ec34f50129f51a013de4a..d89876b806a0eb5a79adc0cce7546fca1f95b164 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -202,10 +202,11 @@ struct skb_shared_info { */ atomic_t dataref; - skb_frag_t frags[MAX_SKB_FRAGS]; /* Intermediate layers must ensure that destructor_arg * remains valid until skb destructor */ void * destructor_arg; + /* must be last field, see pskb_expand_head() */ + skb_frag_t frags[MAX_SKB_FRAGS]; }; /* We divide dataref into two halves. The higher 16 bits hold references diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 76d33ca5f037a5c886052e9e7aff206ee266c654..7da58a25ad923b74a0486ced4e516305efd0d187 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -817,7 +817,7 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail, memcpy(data + nhead, skb->head, skb->tail - skb->head); #endif memcpy(data + size, skb_end_pointer(skb), - sizeof(struct skb_shared_info)); + offsetof(struct skb_shared_info, frags[skb_shinfo(skb)->nr_frags])); for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) get_page(skb_shinfo(skb)->frags[i].page);