u32: negative offset fix
It was possible to use a negative offset in a u32 match to reference the ethernet header or other parts of the link layer header. This fixes the regression caused by: commit fbc2e7d9 Author: Changli Gao <xiaosuo@gmail.com> Date: Wed Jun 2 07:32:42 2010 -0700 cls_u32: use skb_header_pointer() to dereference data safely Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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