gro: Fix handling of headers that extend over the tail
The skb_gro_* code fails to handle the case where a header starts
in the linear area but ends in the frags area. Since the goal
of skb_gro_* is to optimise the case of completely non-linear
packets, we can simply bail out if we have anything in the linear
area.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/dev.c b/net/core/dev.c
index e48c08a..6785b06 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2378,18 +2378,13 @@
unsigned int offset = skb_gro_offset(skb);
hlen += offset;
- if (hlen <= skb_headlen(skb))
- return skb->data + offset;
-
- if (unlikely(!skb_shinfo(skb)->nr_frags ||
- skb_shinfo(skb)->frags[0].size <=
- hlen - skb_headlen(skb) ||
+ if (unlikely(skb_headlen(skb) ||
+ skb_shinfo(skb)->frags[0].size < hlen ||
PageHighMem(skb_shinfo(skb)->frags[0].page)))
return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL;
return page_address(skb_shinfo(skb)->frags[0].page) +
- skb_shinfo(skb)->frags[0].page_offset +
- offset - skb_headlen(skb);
+ skb_shinfo(skb)->frags[0].page_offset + offset;
}
EXPORT_SYMBOL(skb_gro_header);