net: add skb frag size accessors
To ease skb->truesize sanitization, its better to be able to localize
all references to skb frags size.
Define accessors : skb_frag_size() to fetch frag size, and
skb_frag_size_{set|add|sub}() to manipulate it.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/user_dma.c b/net/core/user_dma.c
index 34e9664..2d7cf3d 100644
--- a/net/core/user_dma.c
+++ b/net/core/user_dma.c
@@ -71,13 +71,13 @@
/* Copy paged appendix. Hmm... why does this look so complicated? */
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
int end;
+ const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
WARN_ON(start > offset + len);
- end = start + skb_shinfo(skb)->frags[i].size;
+ end = start + skb_frag_size(frag);
copy = end - offset;
if (copy > 0) {
- skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
struct page *page = skb_frag_page(frag);
if (copy > len)