rtl8139: check IP Total Length field (CVE-2015-5165)
The IP Total Length field includes the IP header and data. Make sure it is valid and does not exceed the Ethernet payload size. Reported-by: N朱东海(启路) <donghai.zdh@alibaba-inc.com> Reviewed-by: NJason Wang <jasowang@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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