tree 4730d75c6e2edf50b0e61087178baa9092647b94
parent bfb85c9f753a7172bd962e8717118191dfd612cc
author Herbert Xu <herbert@gondor.apana.org.au> 1193009266 -0700
committer David S. Miller <davem@sunset.davemloft.net> 1193047193 -0700

[NET]: Fix SKB_WITH_OVERHEAD calculation

The calculation in SKB_WITH_OVERHEAD is incorrect in that it can cause
an overflow across a page boundary which is what it's meant to prevent.
In particular, the header length (X) should not be lumped together with
skb_shared_info.  The latter needs to be aligned properly while the header
has no choice but to sit in front of wherever the payload is.

Therefore the correct calculation is to take away the aligned size of
skb_shared_info, and then subtract the header length.  The resulting
quantity L satisfies the following inequality:

	SKB_DATA_ALIGN(L + X) + sizeof(struct skb_shared_info) <= PAGE_SIZE

This is the quantity used by alloc_skb to do the actual allocation.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>