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ipv4: Correct comparisons and calculations using skb->tail and skb-transport_header

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This corrects an regression introduced by "net: Use 16bits for *_headers
fields of struct skbuff" when NET_SKBUFF_DATA_USES_OFFSET is not set. In
that case skb->tail will be a pointer whereas skb->transport_header
will be an offset from head. This is corrected by using wrappers that
ensure that comparisons and calculations are always made using pointers.

Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Simon Horman 2013-05-28 20:34:27 +00:00 • committed by David S. Miller
parent 29a3cad5c6
commit f7c0c2ae84
3 changed files with 5 additions and 3 deletions
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3
net/ipv4/tcp.c
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@ -2989,7 +2989,8 @@ struct sk_buff *tcp_tso_segment(struct sk_buff *skb,
swap(gso_skb->truesize, skb->truesize);
}
delta = htonl(oldlen + (skb->tail - skb->transport_header) +
delta = htonl(oldlen + (skb_tail_pointer(skb) -
skb_transport_header(skb)) +
skb->data_len);
th->check = ~csum_fold((__force __wsum)((__force u32)th->check +
(__force u32)delta));