skb_frag_address_safe
iov[iov_index].iov_base = skb_frag_address_safe(skb_frag);
iov[iov_index].iov_base = skb_frag_address_safe(skb_frag);
fptr = skb_frag_address_safe(frag);
void *fragdata = skb_frag_address_safe(frag);
skb_frag_address_safe(frag), skb_frag_size(frag));
ptr = skb_frag_address_safe(&shinfo->frags[0]);
p = skb_frag_address_safe(frag);