Commit c6296ea8 authored by Stefan Hajnoczi's avatar Stefan Hajnoczi
Browse files

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: default avatar朱东海(启路) <donghai.zdh@alibaba-inc.com>
Reviewed-by: default avatarJason Wang <jasowang@redhat.com>
Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
parent 03247d43

hw/net/rtl8139.c

+6 −1
Original line number Diff line number Diff line
@@ -2191,7 +2191,12 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s) 
            }



            ip_protocol = ip->ip_p;

            ip_data_len = be16_to_cpu(ip->ip_len) - hlen;



            ip_data_len = be16_to_cpu(ip->ip_len);

            if (ip_data_len < hlen || ip_data_len > eth_payload_len) {

                goto skip_offload;

            }

            ip_data_len -= hlen;



            if (txdw0 & CP_TX_IPCS)

            {